Eloquent: 快速入门

简介
生成模型类
Eloquent 模型约定
模型检索
检索单个模型 / 聚合
- 检索或创建模型
- 检索聚合
新增 & 更新模型
删除模型
- 软删除
- 查询已被软删除模型
修剪模型
复制模型
查询作用域
模型对比
事件

简介

Laravel 包含的 Eloquent 模块，是一个对象关系映射 (ORM)，能使你更愉快地交互数据库。当你使用 Eloquent 时，数据库中每张表都有一个相对应的” 模型” 用于操作这张表。除了能从数据表中检索数据记录之外，Eloquent 模型同时也允许你新增，更新和删除这对应表中的数据。

[!注意]
在开始之前，请务必在应用程序的 config/database.php 配置文件中配置数据库连接。有关配置数据库的更多信息，请参阅数据库配置文档。

zzznl 翻译于

由 gyp719 审阅

生成模型类

首先，让我们创建一个 Eloquent 模型。模型通常位于 app\Models 目录中，并扩展 Illuminate\Database\Eloquent\Model 类。您可以使用 make:model Artisan 命令生成新模型：

php artisan make:model Flight

如果您希望在生成模型时生成一个数据库迁移，可以使用 --migration 或 -m 选项：

php artisan make:model Flight --migration

在生成模型时，你可以生成各种其他类型的类，如工厂、填充器、策略、控制器和表单请求。此外，这些选项可以组合在一起一次创建多个类：

# 生成模型和 FlightFactory 类...
php artisan make:model Flight --factory
php artisan make:model Flight -f

# 生成模型和 FlightSeeder 类...
php artisan make:model Flight --seed
php artisan make:model Flight -s

# 生成模型和 FlightController 类...
php artisan make:model Flight --controller
php artisan make:model Flight -c

# 生成模型、FlightController 资源类和表单请求类...
php artisan make:model Flight --controller --resource --requests
php artisan make:model Flight -crR

# 生成模型和 FlightPolicy 类...
php artisan make:model Flight --policy

# 生成模型和迁移、工厂、填充器和控制器...
php artisan make:model Flight -mfsc

# 快捷方式生成一个模型、迁移、工厂、填充器、策略、控制器和表单请求...
php artisan make:model Flight --all
php artisan make:model Flight -a

# 生成一个 pivot 模型...
php artisan make:model Member --pivot
php artisan make:model Member -p

zzznl 翻译于

由 Jader 审阅

模型检查

有时候，仅仅通过浏览其代码很难确定模型的所有可用属性和关系。相反，尝试使用 model:show Artisan 命令，它能方便地概览模型的所有属性和关系：

php artisan model:show Flight

Eloquent 模型约定

make:model 命令生成的模型将放置在 app/Models 目录中。让我们检查一个基本模型类并讨论一些 Eloquent 的关键约定：

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    // ...
}

表名

看完上面的示例后，你可能已经注意到，我们没有告诉 Eloquent Flight 模型对应的是哪个数据库表。按照惯例，类的「snake case」、复数名称将被用作表名，除非明确指定了另一个名称。因此，在本例中，Eloquent 将假设 Flight 模型存储记录在 flights 表中，而 AirTrafficController 模型则会存储记录在 air_traffic_controllers 表中。

如果你的模型对应的数据库表不符合此约定，你可以通过在模型上定义一个 table 属性来手动指定模型的表名：

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    /**
     * 与模型关联的表
     *
     * @var string
     */
    protected $table = 'my_flights';
}

主键

Eloquent 还会假设每个模型的对应数据库表都有一个名为 id 的主键列。如果必要，你可以在你的模型上定义一个受保护的 $primaryKey 属性，以指定一个不同的列作为模型的主键：

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    /**
     * 与表关联的主键
     *
     * @var string
     */
    protected $primaryKey = 'flight_id';
}

zzznl 翻译于

由 Jader 审阅

此外，Eloquent 认为主键是一个递增的整数值，这意味着 Eloquent 将自动将主键转换为整数。如果你希望使用非递增或非数字主键，你必须在模型上定义一个公共的 $incrementing 属性，并将之设置为 false：

<?php

class Flight extends Model
{
    /**
     * 表明模型的 ID 是否自增
     *
     * @var bool
     */
    public $incrementing = false;
}

如果模型的主键不是整数，你应该在模型上定义一个受保护的 $keyType 属性。此属性应该具有 string 的值：

<?php

class Flight extends Model
{
    /**
     * 主键 ID 的数据类型
     *
     * @var string
     */
    protected $keyType = 'string';
}

「复合」主键

Eloquent 要求每个模型至少有一个唯一标识的「ID」，可以作为其主键。Eloquent 模型不支持「复合」主键。不过，你可以在数据库表中添加额外的多列唯一索引，作为表的唯一识别主键。

UUID 与 ULID 键

你可能选择使用 UUID 而不是自增整数作为 Eloquent 模型的主键。UUID 是全球唯一的字母数字标识符，长度为 36 个字符。

如果你希望模型使用 UUID 键而不是自增整数键，你可以在模型上使用 Illuminate\Database\Eloquent\Concerns\HasUuids。当然，你应该确保模型有一个相当于UUID 的主键列：

use Illuminate\Database\Eloquent\Concerns\HasUuids;
use Illuminate\Database\Eloquent\Model;

class Article extends Model
{
    use HasUuids;

    // ...
}

$article = Article::create(['title' => 'Traveling to Europe']);

$article->id; // "8f8e8478-9035-4d23-b9a7-62f4d2612ce5"

zzznl 翻译于

由 Jader 审阅

By default, The HasUuids trait will generate "ordered" UUIDs for your models. These UUIDs are more efficient for indexed database storage because they can be sorted lexicographically.

You can override the UUID generation process for a given model by defining a newUniqueId method on the model. In addition, you may specify which columns should receive UUIDs by defining a uniqueIds method on the model:

use Ramsey\Uuid\Uuid;

/**
 * Generate a new UUID for the model.
 */
public function newUniqueId(): string
{
    return (string) Uuid::uuid4();
}

/**
 * Get the columns that should receive a unique identifier.
 *
 * @return array<int, string>
 */
public function uniqueIds(): array
{
    return ['id', 'discount_code'];
}

If you wish, you may choose to utilize "ULIDs" instead of UUIDs. ULIDs are similar to UUIDs; however, they are only 26 characters in length. Like ordered UUIDs, ULIDs are lexicographically sortable for efficient database indexing. To utilize ULIDs, you should use the Illuminate\Database\Eloquent\Concerns\HasUlids trait on your model. You should also ensure that the model has a ULID equivalent primary key column:

use Illuminate\Database\Eloquent\Concerns\HasUlids;
use Illuminate\Database\Eloquent\Model;

class Article extends Model
{
    use HasUlids;

    // ...
}

$article = Article::create(['title' => 'Traveling to Asia']);

$article->id; // "01gd4d3tgrrfqeda94gdbtdk5c"

Timestamps

By default, Eloquent expects created_at and updated_at columns to exist on your model's corresponding database table. Eloquent will automatically set these column's values when models are created or updated. If you do not want these columns to be automatically managed by Eloquent, you should define a $timestamps property on your model with a value of false:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    /**
     * Indicates if the model should be timestamped.
     *
     * @var bool
     */
    public $timestamps = false;
}

If you need to customize the format of your model's timestamps, set the $dateFormat property on your model. This property determines how date attributes are stored in the database as well as their format when the model is serialized to an array or JSON:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    /**
     * The storage format of the model's date columns.
     *
     * @var string
     */
    protected $dateFormat = 'U';
}

If you need to customize the names of the columns used to store the timestamps, you may define CREATED_AT and UPDATED_AT constants on your model:

<?php

class Flight extends Model
{
    const CREATED_AT = 'creation_date';
    const UPDATED_AT = 'updated_date';
}

If you would like to perform model operations without the model having its updated_at timestamp modified, you may operate on the model within a closure given to the withoutTimestamps method:

Model::withoutTimestamps(fn () => $post->increment('reads'));

Database Connections

By default, all Eloquent models will use the default database connection that is configured for your application. If you would like to specify a different connection that should be used when interacting with a particular model, you should define a $connection property on the model:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    /**
     * The database connection that should be used by the model.
     *
     * @var string
     */
    protected $connection = 'mysql';
}

Default Attribute Values

By default, a newly instantiated model instance will not contain any attribute values. If you would like to define the default values for some of your model's attributes, you may define an $attributes property on your model. Attribute values placed in the $attributes array should be in their raw, "storable" format as if they were just read from the database:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    /**
     * The model's default values for attributes.
     *
     * @var array
     */
    protected $attributes = [
        'options' => '[]',
        'delayed' => false,
    ];
}

Configuring Eloquent Strictness

Laravel offers several methods that allow you to configure Eloquent's behavior and "strictness" in a variety of situations.

First, the preventLazyLoading method accepts an optional boolean argument that indicates if lazy loading should be prevented. For example, you may wish to only disable lazy loading in non-production environments so that your production environment will continue to function normally even if a lazy loaded relationship is accidentally present in production code. Typically, this method should be invoked in the boot method of your application's AppServiceProvider:

use Illuminate\Database\Eloquent\Model;

/**
 * Bootstrap any application services.
 */
public function boot(): void
{
    Model::preventLazyLoading(! $this->app->isProduction());
}

Also, you may instruct Laravel to throw an exception when attempting to fill an unfillable attribute by invoking the preventSilentlyDiscardingAttributes method. This can help prevent unexpected errors during local development when attempting to set an attribute that has not been added to the model's fillable array:

Model::preventSilentlyDiscardingAttributes(! $this->app->isProduction());

Retrieving Models

Once you have created a model and its associated database table, you are ready to start retrieving data from your database. You can think of each Eloquent model as a powerful query builder allowing you to fluently query the database table associated with the model. The model's all method will retrieve all of the records from the model's associated database table:

use App\Models\Flight;

foreach (Flight::all() as $flight) {
    echo $flight->name;
}

Building Queries

The Eloquent all method will return all of the results in the model's table. However, since each Eloquent model serves as a query builder, you may add additional constraints to queries and then invoke the get method to retrieve the results:

$flights = Flight::where('active', 1)
    ->orderBy('name')
    ->take(10)
    ->get();

[!NOTE]
Since Eloquent models are query builders, you should review all of the methods provided by Laravel's query builder. You may use any of these methods when writing your Eloquent queries.

Refreshing Models

If you already have an instance of an Eloquent model that was retrieved from the database, you can "refresh" the model using the fresh and refresh methods. The fresh method will re-retrieve the model from the database. The existing model instance will not be affected:

$flight = Flight::where('number', 'FR 900')->first();

$freshFlight = $flight->fresh();

The refresh method will re-hydrate the existing model using fresh data from the database. In addition, all of its loaded relationships will be refreshed as well:

$flight = Flight::where('number', 'FR 900')->first();

$flight->number = 'FR 456';

$flight->refresh();

$flight->number; // "FR 900"

Collections

As we have seen, Eloquent methods like all and get retrieve multiple records from the database. However, these methods don't return a plain PHP array. Instead, an instance of Illuminate\Database\Eloquent\Collection is returned.

The Eloquent Collection class extends Laravel's base Illuminate\Support\Collection class, which provides a variety of helpful methods for interacting with data collections. For example, the reject method may be used to remove models from a collection based on the results of an invoked closure:

$flights = Flight::where('destination', 'Paris')->get();

$flights = $flights->reject(function (Flight $flight) {
    return $flight->cancelled;
});

In addition to the methods provided by Laravel's base collection class, the Eloquent collection class provides a few extra methods that are specifically intended for interacting with collections of Eloquent models.

Since all of Laravel's collections implement PHP's iterable interfaces, you may loop over collections as if they were an array:

foreach ($flights as $flight) {
    echo $flight->name;
}

Chunking Results

Your application may run out of memory if you attempt to load tens of thousands of Eloquent records via the all or get methods. Instead of using these methods, the chunk method may be used to process large numbers of models more efficiently.

The chunk method will retrieve a subset of Eloquent models, passing them to a closure for processing. Since only the current chunk of Eloquent models is retrieved at a time, the chunk method will provide significantly reduced memory usage when working with a large number of models:

use App\Models\Flight;
use Illuminate\Database\Eloquent\Collection;

Flight::chunk(200, function (Collection $flights) {
    foreach ($flights as $flight) {
        // ...
    }
});

The first argument passed to the chunk method is the number of records you wish to receive per "chunk". The closure passed as the second argument will be invoked for each chunk that is retrieved from the database. A database query will be executed to retrieve each chunk of records passed to the closure.

If you are filtering the results of the chunk method based on a column that you will also be updating while iterating over the results, you should use the chunkById method. Using the chunk method in these scenarios could lead to unexpected and inconsistent results. Internally, the chunkById method will always retrieve models with an id column greater than the last model in the previous chunk:

Flight::where('departed', true)
    ->chunkById(200, function (Collection $flights) {
        $flights->each->update(['departed' => false]);
    }, column: 'id');

Since the chunkById and lazyById methods add their own "where" conditions to the query being executed, you should typically logically group your own conditions within a closure:

Flight::where(function ($query) {
    $query->where('delayed', true)->orWhere('cancelled', true);
})->chunkById(200, function (Collection $flights) {
    $flights->each->update([
        'departed' => false,
        'cancelled' => true
    ]);
}, column: 'id');

Chunking Using Lazy Collections

The lazy method works similarly to the chunk method in the sense that, behind the scenes, it executes the query in chunks. However, instead of passing each chunk directly into a callback as is, the lazy method returns a flattened LazyCollection of Eloquent models, which lets you interact with the results as a single stream:

use App\Models\Flight;

foreach (Flight::lazy() as $flight) {
    // ...
}

If you are filtering the results of the lazy method based on a column that you will also be updating while iterating over the results, you should use the lazyById method. Internally, the lazyById method will always retrieve models with an id column greater than the last model in the previous chunk:

Flight::where('departed', true)
    ->lazyById(200, column: 'id')
    ->each->update(['departed' => false]);

You may filter the results based on the descending order of the id using the lazyByIdDesc method.

Cursors

Similar to the lazy method, the cursor method may be used to significantly reduce your application's memory consumption when iterating through tens of thousands of Eloquent model records.

The cursor method will only execute a single database query; however, the individual Eloquent models will not be hydrated until they are actually iterated over. Therefore, only one Eloquent model is kept in memory at any given time while iterating over the cursor.

[!WARNING]
Since the cursor method only ever holds a single Eloquent model in memory at a time, it cannot eager load relationships. If you need to eager load relationships, consider using the lazy method instead.

Internally, the cursor method uses PHP generators to implement this functionality:

use App\Models\Flight;

foreach (Flight::where('destination', 'Zurich')->cursor() as $flight) {
    // ...
}

The cursor returns an Illuminate\Support\LazyCollection instance. Lazy collections allow you to use many of the collection methods available on typical Laravel collections while only loading a single model into memory at a time:

use App\Models\User;

$users = User::cursor()->filter(function (User $user) {
    return $user->id > 500;
});

foreach ($users as $user) {
    echo $user->id;
}

Although the cursor method uses far less memory than a regular query (by only holding a single Eloquent model in memory at a time), it will still eventually run out of memory. This is due to PHP's PDO driver internally caching all raw query results in its buffer. If you're dealing with a very large number of Eloquent records, consider using the lazy method instead.

Advanced Subqueries

Subquery Selects

Eloquent also offers advanced subquery support, which allows you to pull information from related tables in a single query. For example, let's imagine that we have a table of flight destinations and a table of flights to destinations. The flights table contains an arrived_at column which indicates when the flight arrived at the destination.

Using the subquery functionality available to the query builder's select and addSelect methods, we can select all of the destinations and the name of the flight that most recently arrived at that destination using a single query:

use App\Models\Destination;
use App\Models\Flight;

return Destination::addSelect(['last_flight' => Flight::select('name')
    ->whereColumn('destination_id', 'destinations.id')
    ->orderByDesc('arrived_at')
    ->limit(1)
])->get();

Subquery Ordering

In addition, the query builder's orderBy function supports subqueries. Continuing to use our flight example, we may use this functionality to sort all destinations based on when the last flight arrived at that destination. Again, this may be done while executing a single database query:

return Destination::orderByDesc(
    Flight::select('arrived_at')
        ->whereColumn('destination_id', 'destinations.id')
        ->orderByDesc('arrived_at')
        ->limit(1)
)->get();

Retrieving Single Models / Aggregates

In addition to retrieving all of the records matching a given query, you may also retrieve single records using the find, first, or firstWhere methods. Instead of returning a collection of models, these methods return a single model instance:

use App\Models\Flight;

// Retrieve a model by its primary key...
$flight = Flight::find(1);

// Retrieve the first model matching the query constraints...
$flight = Flight::where('active', 1)->first();

// Alternative to retrieving the first model matching the query constraints...
$flight = Flight::firstWhere('active', 1);

Sometimes you may wish to perform some other action if no results are found. The findOr and firstOr methods will return a single model instance or, if no results are found, execute the given closure. The value returned by the closure will be considered the result of the method:

$flight = Flight::findOr(1, function () {
    // ...
});

$flight = Flight::where('legs', '>', 3)->firstOr(function () {
    // ...
});

Not Found Exceptions

Sometimes you may wish to throw an exception if a model is not found. This is particularly useful in routes or controllers. The findOrFail and firstOrFail methods will retrieve the first result of the query; however, if no result is found, an Illuminate\Database\Eloquent\ModelNotFoundException will be thrown:

$flight = Flight::findOrFail(1);

$flight = Flight::where('legs', '>', 3)->firstOrFail();

If the ModelNotFoundException is not caught, a 404 HTTP response is automatically sent back to the client:

use App\Models\Flight;

Route::get('/api/flights/{id}', function (string $id) {
    return Flight::findOrFail($id);
});

Retrieving or Creating Models

The firstOrCreate method will attempt to locate a database record using the given column / value pairs. If the model cannot be found in the database, a record will be inserted with the attributes resulting from merging the first array argument with the optional second array argument:

The firstOrNew method, like firstOrCreate, will attempt to locate a record in the database matching the given attributes. However, if a model is not found, a new model instance will be returned. Note that the model returned by firstOrNew has not yet been persisted to the database. You will need to manually call the save method to persist it:

use App\Models\Flight;

// Retrieve flight by name or create it if it doesn't exist...
$flight = Flight::firstOrCreate([
    'name' => 'London to Paris'
]);

// Retrieve flight by name or create it with the name, delayed, and arrival_time attributes...
$flight = Flight::firstOrCreate(
    ['name' => 'London to Paris'],
    ['delayed' => 1, 'arrival_time' => '11:30']
);

// Retrieve flight by name or instantiate a new Flight instance...
$flight = Flight::firstOrNew([
    'name' => 'London to Paris'
]);

// Retrieve flight by name or instantiate with the name, delayed, and arrival_time attributes...
$flight = Flight::firstOrNew(
    ['name' => 'Tokyo to Sydney'],
    ['delayed' => 1, 'arrival_time' => '11:30']
);

Retrieving Aggregates

When interacting with Eloquent models, you may also use the count, sum, max, and other aggregate methods provided by the Laravel query builder. As you might expect, these methods return a scalar value instead of an Eloquent model instance:

$count = Flight::where('active', 1)->count();

$max = Flight::where('active', 1)->max('price');

Inserting and Updating Models

Inserts

Of course, when using Eloquent, we don't only need to retrieve models from the database. We also need to insert new records. Thankfully, Eloquent makes it simple. To insert a new record into the database, you should instantiate a new model instance and set attributes on the model. Then, call the save method on the model instance:

<?php

namespace App\Http\Controllers;

use App\Models\Flight;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;

class FlightController extends Controller
{
    /**
     * Store a new flight in the database.
     */
    public function store(Request $request): RedirectResponse
    {
        // Validate the request...

        $flight = new Flight;

        $flight->name = $request->name;

        $flight->save();

        return redirect('/flights');
    }
}

In this example, we assign the name field from the incoming HTTP request to the name attribute of the App\Models\Flight model instance. When we call the save method, a record will be inserted into the database. The model's created_at and updated_at timestamps will automatically be set when the save method is called, so there is no need to set them manually.

Alternatively, you may use the create method to "save" a new model using a single PHP statement. The inserted model instance will be returned to you by the create method:

use App\Models\Flight;

$flight = Flight::create([
    'name' => 'London to Paris',
]);

However, before using the create method, you will need to specify either a fillable or guarded property on your model class. These properties are required because all Eloquent models are protected against mass assignment vulnerabilities by default. To learn more about mass assignment, please consult the mass assignment documentation.

Updates

The save method may also be used to update models that already exist in the database. To update a model, you should retrieve it and set any attributes you wish to update. Then, you should call the model's save method. Again, the updated_at timestamp will automatically be updated, so there is no need to manually set its value:

use App\Models\Flight;

$flight = Flight::find(1);

$flight->name = 'Paris to London';

$flight->save();

Occasionally, you may need to update an existing model or create a new model if no matching model exists. Like the firstOrCreate method, the updateOrCreate method persists the model, so there's no need to manually call the save method.

In the example below, if a flight exists with a departure location of Oakland and a destination location of San Diego, its price and discounted columns will be updated. If no such flight exists, a new flight will be created which has the attributes resulting from merging the first argument array with the second argument array:

$flight = Flight::updateOrCreate(
    ['departure' => 'Oakland', 'destination' => 'San Diego'],
    ['price' => 99, 'discounted' => 1]
);

Mass Updates

Updates can also be performed against models that match a given query. In this example, all flights that are active and have a destination of San Diego will be marked as delayed:

Flight::where('active', 1)
    ->where('destination', 'San Diego')
    ->update(['delayed' => 1]);

The update method expects an array of column and value pairs representing the columns that should be updated. The update method returns the number of affected rows.

[!WARNING]
When issuing a mass update via Eloquent, the saving, saved, updating, and updated model events will not be fired for the updated models. This is because the models are never actually retrieved when issuing a mass update.

Examining Attribute Changes

Eloquent provides the isDirty, isClean, and wasChanged methods to examine the internal state of your model and determine how its attributes have changed from when the model was originally retrieved.

The isDirty method determines if any of the model's attributes have been changed since the model was retrieved. You may pass a specific attribute name or an array of attributes to the isDirty method to determine if any of the attributes are "dirty". The isClean method will determine if an attribute has remained unchanged since the model was retrieved. This method also accepts an optional attribute argument:

use App\Models\User;

$user = User::create([
    'first_name' => 'Taylor',
    'last_name' => 'Otwell',
    'title' => 'Developer',
]);

$user->title = 'Painter';

$user->isDirty(); // true
$user->isDirty('title'); // true
$user->isDirty('first_name'); // false
$user->isDirty(['first_name', 'title']); // true

$user->isClean(); // false
$user->isClean('title'); // false
$user->isClean('first_name'); // true
$user->isClean(['first_name', 'title']); // false

$user->save();

$user->isDirty(); // false
$user->isClean(); // true

The wasChanged method determines if any attributes were changed when the model was last saved within the current request cycle. If needed, you may pass an attribute name to see if a particular attribute was changed:

$user = User::create([
    'first_name' => 'Taylor',
    'last_name' => 'Otwell',
    'title' => 'Developer',
]);

$user->title = 'Painter';

$user->save();

$user->wasChanged(); // true
$user->wasChanged('title'); // true
$user->wasChanged(['title', 'slug']); // true
$user->wasChanged('first_name'); // false
$user->wasChanged(['first_name', 'title']); // true

The getOriginal method returns an array containing the original attributes of the model regardless of any changes to the model since it was retrieved. If needed, you may pass a specific attribute name to get the original value of a particular attribute:

$user = User::find(1);

$user->name; // John
$user->email; // john@example.com

$user->name = 'Jack';
$user->name; // Jack

$user->getOriginal('name'); // John
$user->getOriginal(); // Array of original attributes...

The getChanges method returns an array containing the attributes that changed when the model was last saved, while the getPrevious method returns an array containing the original attribute values before the model was last saved:

$user = User::find(1);

$user->name; // John
$user->email; // john@example.com

$user->update([
    'name' => 'Jack',
    'email' => 'jack@example.com',
]);

$user->getChanges();

/*
    [
        'name' => 'Jack',
        'email' => 'jack@example.com',
    ]
*/

$user->getPrevious();

/*
    [
        'name' => 'John',
        'email' => 'john@example.com',
    ]
*/

Mass Assignment

You may use the create method to "save" a new model using a single PHP statement. The inserted model instance will be returned to you by the method:

use App\Models\Flight;

$flight = Flight::create([
    'name' => 'London to Paris',
]);

However, before using the create method, you will need to specify either a fillable or guarded property on your model class. These properties are required because all Eloquent models are protected against mass assignment vulnerabilities by default.

A mass assignment vulnerability occurs when a user passes an unexpected HTTP request field and that field changes a column in your database that you did not expect. For example, a malicious user might send an is_admin parameter through an HTTP request, which is then passed to your model's create method, allowing the user to escalate themselves to an administrator.

So, to get started, you should define which model attributes you want to make mass assignable. You may do this using the $fillable property on the model. For example, let's make the name attribute of our Flight model mass assignable:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Flight extends Model
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = ['name'];
}

Once you have specified which attributes are mass assignable, you may use the create method to insert a new record in the database. The create method returns the newly created model instance:

$flight = Flight::create(['name' => 'London to Paris']);

If you already have a model instance, you may use the fill method to populate it with an array of attributes:

$flight->fill(['name' => 'Amsterdam to Frankfurt']);

Mass Assignment and JSON Columns

When assigning JSON columns, each column's mass assignable key must be specified in your model's $fillable array. For security, Laravel does not support updating nested JSON attributes when using the guarded property:

/**
 * The attributes that are mass assignable.
 *
 * @var array<int, string>
 */
protected $fillable = [
    'options->enabled',
];

Allowing Mass Assignment

If you would like to make all of your attributes mass assignable, you may define your model's $guarded property as an empty array. If you choose to unguard your model, you should take special care to always hand-craft the arrays passed to Eloquent's fill, create, and update methods:

/**
 * The attributes that aren't mass assignable.
 *
 * @var array<string>|bool
 */
protected $guarded = [];

Mass Assignment Exceptions

By default, attributes that are not included in the $fillable array are silently discarded when performing mass-assignment operations. In production, this is expected behavior; however, during local development it can lead to confusion as to why model changes are not taking effect.

If you wish, you may instruct Laravel to throw an exception when attempting to fill an unfillable attribute by invoking the preventSilentlyDiscardingAttributes method. Typically, this method should be invoked in the boot method of your application's AppServiceProvider class:

use Illuminate\Database\Eloquent\Model;

/**
 * Bootstrap any application services.
 */
public function boot(): void
{
    Model::preventSilentlyDiscardingAttributes($this->app->isLocal());
}

Upserts

Eloquent's upsert method may be used to update or create records in a single, atomic operation. The method's first argument consists of the values to insert or update, while the second argument lists the column(s) that uniquely identify records within the associated table. The method's third and final argument is an array of the columns that should be updated if a matching record already exists in the database. The upsert method will automatically set the created_at and updated_at timestamps if timestamps are enabled on the model:

Flight::upsert([
    ['departure' => 'Oakland', 'destination' => 'San Diego', 'price' => 99],
    ['departure' => 'Chicago', 'destination' => 'New York', 'price' => 150]
], uniqueBy: ['departure', 'destination'], update: ['price']);

[!WARNING]
All databases except SQL Server require the columns in the second argument of the upsert method to have a "primary" or "unique" index. In addition, the MariaDB and MySQL database drivers ignore the second argument of the upsert method and always use the "primary" and "unique" indexes of the table to detect existing records.

Deleting Models

To delete a model, you may call the delete method on the model instance:

use App\Models\Flight;

$flight = Flight::find(1);

$flight->delete();

Deleting an Existing Model by its Primary Key

In the example above, we are retrieving the model from the database before calling the delete method. However, if you know the primary key of the model, you may delete the model without explicitly retrieving it by calling the destroy method. In addition to accepting the single primary key, the destroy method will accept multiple primary keys, an array of primary keys, or a collection of primary keys:

Flight::destroy(1);

Flight::destroy(1, 2, 3);

Flight::destroy([1, 2, 3]);

Flight::destroy(collect([1, 2, 3]));

If you are utilizing soft deleting models, you may permanently delete models via the forceDestroy method:

Flight::forceDestroy(1);

[!WARNING]
The destroy method loads each model individually and calls the delete method so that the deleting and deleted events are properly dispatched for each model.

Deleting Models Using Queries

Of course, you may build an Eloquent query to delete all models matching your query's criteria. In this example, we will delete all flights that are marked as inactive. Like mass updates, mass deletes will not dispatch model events for the models that are deleted:

$deleted = Flight::where('active', 0)->delete();

To delete all models in a table, you should execute a query without adding any conditions:

$deleted = Flight::query()->delete();

[!WARNING]
When executing a mass delete statement via Eloquent, the deleting and deleted model events will not be dispatched for the deleted models. This is because the models are never actually retrieved when executing the delete statement.

Soft Deleting

In addition to actually removing records from your database, Eloquent can also "soft delete" models. When models are soft deleted, they are not actually removed from your database. Instead, a deleted_at attribute is set on the model indicating the date and time at which the model was "deleted". To enable soft deletes for a model, add the Illuminate\Database\Eloquent\SoftDeletes trait to the model:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class Flight extends Model
{
    use SoftDeletes;
}

[!NOTE]
The SoftDeletes trait will automatically cast the deleted_at attribute to a DateTime / Carbon instance for you.

You should also add the deleted_at column to your database table. The Laravel schema builder contains a helper method to create this column:

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

Schema::table('flights', function (Blueprint $table) {
    $table->softDeletes();
});

Schema::table('flights', function (Blueprint $table) {
    $table->dropSoftDeletes();
});

Now, when you call the delete method on the model, the deleted_at column will be set to the current date and time. However, the model's database record will be left in the table. When querying a model that uses soft deletes, the soft deleted models will automatically be excluded from all query results.

To determine if a given model instance has been soft deleted, you may use the trashed method:

if ($flight->trashed()) {
    // ...
}

Restoring Soft Deleted Models

Sometimes you may wish to "un-delete" a soft deleted model. To restore a soft deleted model, you may call the restore method on a model instance. The restore method will set the model's deleted_at column to null:

$flight->restore();

You may also use the restore method in a query to restore multiple models. Again, like other "mass" operations, this will not dispatch any model events for the models that are restored:

Flight::withTrashed()
    ->where('airline_id', 1)
    ->restore();

The restore method may also be used when building relationship queries:

$flight->history()->restore();

Permanently Deleting Models

Sometimes you may need to truly remove a model from your database. You may use the forceDelete method to permanently remove a soft deleted model from the database table:

$flight->forceDelete();

You may also use the forceDelete method when building Eloquent relationship queries:

$flight->history()->forceDelete();

Querying Soft Deleted Models

Including Soft Deleted Models

As noted above, soft deleted models will automatically be excluded from query results. However, you may force soft deleted models to be included in a query's results by calling the withTrashed method on the query:

use App\Models\Flight;

$flights = Flight::withTrashed()
    ->where('account_id', 1)
    ->get();

The withTrashed method may also be called when building a relationship query:

$flight->history()->withTrashed()->get();

Retrieving Only Soft Deleted Models

The onlyTrashed method will retrieve only soft deleted models:

$flights = Flight::onlyTrashed()
    ->where('airline_id', 1)
    ->get();

Pruning Models

Sometimes you may want to periodically delete models that are no longer needed. To accomplish this, you may add the Illuminate\Database\Eloquent\Prunable or Illuminate\Database\Eloquent\MassPrunable trait to the models you would like to periodically prune. After adding one of the traits to the model, implement a prunable method which returns an Eloquent query builder that resolves the models that are no longer needed:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Prunable;

class Flight extends Model
{
    use Prunable;

    /**
     * Get the prunable model query.
     */
    public function prunable(): Builder
    {
        return static::where('created_at', '<=', now()->subMonth());
    }
}

When marking models as Prunable, you may also define a pruning method on the model. This method will be called before the model is deleted. This method can be useful for deleting any additional resources associated with the model, such as stored files, before the model is permanently removed from the database:

/**
 * Prepare the model for pruning.
 */
protected function pruning(): void
{
    // ...
}

After configuring your prunable model, you should schedule the model:prune Artisan command in your application's routes/console.php file. You are free to choose the appropriate interval at which this command should be run:

use Illuminate\Support\Facades\Schedule;

Schedule::command('model:prune')->daily();

Behind the scenes, the model:prune command will automatically detect "Prunable" models within your application's app/Models directory. If your models are in a different location, you may use the --model option to specify the model class names:

Schedule::command('model:prune', [
    '--model' => [Address::class, Flight::class],
])->daily();

If you wish to exclude certain models from being pruned while pruning all other detected models, you may use the --except option:

Schedule::command('model:prune', [
    '--except' => [Address::class, Flight::class],
])->daily();

You may test your prunable query by executing the model:prune command with the --pretend option. When pretending, the model:prune command will simply report how many records would be pruned if the command were to actually run:

php artisan model:prune --pretend

[!WARNING]
Soft deleting models will be permanently deleted (forceDelete) if they match the prunable query.

Mass Pruning

When models are marked with the Illuminate\Database\Eloquent\MassPrunable trait, models are deleted from the database using mass-deletion queries. Therefore, the pruning method will not be invoked, nor will the deleting and deleted model events be dispatched. This is because the models are never actually retrieved before deletion, thus making the pruning process much more efficient:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\MassPrunable;

class Flight extends Model
{
    use MassPrunable;

    /**
     * Get the prunable model query.
     */
    public function prunable(): Builder
    {
        return static::where('created_at', '<=', now()->subMonth());
    }
}

Replicating Models

You may create an unsaved copy of an existing model instance using the replicate method. This method is particularly useful when you have model instances that share many of the same attributes:

use App\Models\Address;

$shipping = Address::create([
    'type' => 'shipping',
    'line_1' => '123 Example Street',
    'city' => 'Victorville',
    'state' => 'CA',
    'postcode' => '90001',
]);

$billing = $shipping->replicate()->fill([
    'type' => 'billing'
]);

$billing->save();

To exclude one or more attributes from being replicated to the new model, you may pass an array to the replicate method:

$flight = Flight::create([
    'destination' => 'LAX',
    'origin' => 'LHR',
    'last_flown' => '2020-03-04 11:00:00',
    'last_pilot_id' => 747,
]);

$flight = $flight->replicate([
    'last_flown',
    'last_pilot_id'
]);

Query Scopes

Global Scopes

Global scopes allow you to add constraints to all queries for a given model. Laravel's own soft delete functionality utilizes global scopes to only retrieve "non-deleted" models from the database. Writing your own global scopes can provide a convenient, easy way to make sure every query for a given model receives certain constraints.

Generating Scopes

To generate a new global scope, you may invoke the make:scope Artisan command, which will place the generated scope in your application's app/Models/Scopes directory:

php artisan make:scope AncientScope

Writing Global Scopes

Writing a global scope is simple. First, use the make:scope command to generate a class that implements the Illuminate\Database\Eloquent\Scope interface. The Scope interface requires you to implement one method: apply. The apply method may add where constraints or other types of clauses to the query as needed:

<?php

namespace App\Models\Scopes;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Scope;

class AncientScope implements Scope
{
    /**
     * Apply the scope to a given Eloquent query builder.
     */
    public function apply(Builder $builder, Model $model): void
    {
        $builder->where('created_at', '<', now()->subYears(2000));
    }
}

[!NOTE]
If your global scope is adding columns to the select clause of the query, you should use the addSelect method instead of select. This will prevent the unintentional replacement of the query's existing select clause.

Applying Global Scopes

To assign a global scope to a model, you may simply place the ScopedBy attribute on the model:

<?php

namespace App\Models;

use App\Models\Scopes\AncientScope;
use Illuminate\Database\Eloquent\Attributes\ScopedBy;

#[ScopedBy([AncientScope::class])]
class User extends Model
{
    //
}

Or, you may manually register the global scope by overriding the model's booted method and invoke the model's addGlobalScope method. The addGlobalScope method accepts an instance of your scope as its only argument:

<?php

namespace App\Models;

use App\Models\Scopes\AncientScope;
use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    /**
     * The "booted" method of the model.
     */
    protected static function booted(): void
    {
        static::addGlobalScope(new AncientScope);
    }
}

After adding the scope in the example above to the App\Models\User model, a call to the User::all() method will execute the following SQL query:

select * from `users` where `created_at` < 0021-02-18 00:00:00

Anonymous Global Scopes

Eloquent also allows you to define global scopes using closures, which is particularly useful for simple scopes that do not warrant a separate class of their own. When defining a global scope using a closure, you should provide a scope name of your own choosing as the first argument to the addGlobalScope method:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    /**
     * The "booted" method of the model.
     */
    protected static function booted(): void
    {
        static::addGlobalScope('ancient', function (Builder $builder) {
            $builder->where('created_at', '<', now()->subYears(2000));
        });
    }
}

Removing Global Scopes

If you would like to remove a global scope for a given query, you may use the withoutGlobalScope method. This method accepts the class name of the global scope as its only argument:

User::withoutGlobalScope(AncientScope::class)->get();

Or, if you defined the global scope using a closure, you should pass the string name that you assigned to the global scope:

User::withoutGlobalScope('ancient')->get();

If you would like to remove several or even all of the query's global scopes, you may use the withoutGlobalScopes method:

// Remove all of the global scopes...
User::withoutGlobalScopes()->get();

// Remove some of the global scopes...
User::withoutGlobalScopes([
    FirstScope::class, SecondScope::class
])->get();

Local Scopes

Local scopes allow you to define common sets of query constraints that you may easily re-use throughout your application. For example, you may need to frequently retrieve all users that are considered "popular". To define a scope, add the Scope attribute to an Eloquent method.

Scopes should always return the same query builder instance or void:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Attributes\Scope;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    /**
     * Scope a query to only include popular users.
     */
    #[Scope]
    protected function popular(Builder $query): void
    {
        $query->where('votes', '>', 100);
    }

    /**
     * Scope a query to only include active users.
     */
    #[Scope]
    protected function active(Builder $query): void
    {
        $query->where('active', 1);
    }
}

Utilizing a Local Scope

Once the scope has been defined, you may call the scope methods when querying the model. You can even chain calls to various scopes:

use App\Models\User;

$users = User::popular()->active()->orderBy('created_at')->get();

Combining multiple Eloquent model scopes via an or query operator may require the use of closures to achieve the correct logical grouping:

$users = User::popular()->orWhere(function (Builder $query) {
    $query->active();
})->get();

However, since this can be cumbersome, Laravel provides a "higher order" orWhere method that allows you to fluently chain scopes together without the use of closures:

$users = User::popular()->orWhere->active()->get();

Dynamic Scopes

Sometimes you may wish to define a scope that accepts parameters. To get started, just add your additional parameters to your scope method's signature. Scope parameters should be defined after the $query parameter:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Attributes\Scope;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    /**
     * Scope a query to only include users of a given type.
     */
    #[Scope]
    protected function ofType(Builder $query, string $type): void
    {
        $query->where('type', $type);
    }
}

Once the expected arguments have been added to your scope method's signature, you may pass the arguments when calling the scope:

$users = User::ofType('admin')->get();

Pending Attributes

If you would like to use scopes to create models that have the same attributes as those used to constrain the scope, you may use the withAttributes method when building the scope query:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Attributes\Scope;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    /**
     * Scope the query to only include drafts.
     */
    #[Scope]
    protected function draft(Builder $query): void
    {
        $query->withAttributes([
            'hidden' => true,
        ]);
    }
}

The withAttributes method will add where conditions to the query using the given attributes, and it will also add the given attributes to any models created via the scope:

$draft = Post::draft()->create(['title' => 'In Progress']);

$draft->hidden; // true

To instruct the withAttributes method to not add where conditions to the query, you may set the asConditions argument to false:

$query->withAttributes([
    'hidden' => true,
], asConditions: false);

Comparing Models

Sometimes you may need to determine if two models are the "same" or not. The is and isNot methods may be used to quickly verify two models have the same primary key, table, and database connection or not:

if ($post->is($anotherPost)) {
    // ...
}

if ($post->isNot($anotherPost)) {
    // ...
}

The is and isNot methods are also available when using the belongsTo, hasOne, morphTo, and morphOne relationships. This method is particularly helpful when you would like to compare a related model without issuing a query to retrieve that model:

if ($post->author()->is($user)) {
    // ...
}

Events

[!NOTE]
Want to broadcast your Eloquent events directly to your client-side application? Check out Laravel's model event broadcasting.

Eloquent models dispatch several events, allowing you to hook into the following moments in a model's lifecycle: retrieved, creating, created, updating, updated, saving, saved, deleting, deleted, trashed, forceDeleting, forceDeleted, restoring, restored, and replicating.

The retrieved event will dispatch when an existing model is retrieved from the database. When a new model is saved for the first time, the creating and created events will dispatch. The updating / updated events will dispatch when an existing model is modified and the save method is called. The saving / saved events will dispatch when a model is created or updated - even if the model's attributes have not been changed. Event names ending with -ing are dispatched before any changes to the model are persisted, while events ending with -ed are dispatched after the changes to the model are persisted.

To start listening to model events, define a $dispatchesEvents property on your Eloquent model. This property maps various points of the Eloquent model's lifecycle to your own event classes. Each model event class should expect to receive an instance of the affected model via its constructor:

<?php

namespace App\Models;

use App\Events\UserDeleted;
use App\Events\UserSaved;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;

class User extends Authenticatable
{
    use Notifiable;

    /**
     * The event map for the model.
     *
     * @var array<string, string>
     */
    protected $dispatchesEvents = [
        'saved' => UserSaved::class,
        'deleted' => UserDeleted::class,
    ];
}

After defining and mapping your Eloquent events, you may use event listeners to handle the events.

[!WARNING]
When issuing a mass update or delete query via Eloquent, the saved, updated, deleting, and deleted model events will not be dispatched for the affected models. This is because the models are never actually retrieved when performing mass updates or deletes.

Using Closures

Instead of using custom event classes, you may register closures that execute when various model events are dispatched. Typically, you should register these closures in the booted method of your model:

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    /**
     * The "booted" method of the model.
     */
    protected static function booted(): void
    {
        static::created(function (User $user) {
            // ...
        });
    }
}

If needed, you may utilize queueable anonymous event listeners when registering model events. This will instruct Laravel to execute the model event listener in the background using your application's queue:

use function Illuminate\Events\queueable;

static::created(queueable(function (User $user) {
    // ...
}));

Observers

Defining Observers

If you are listening for many events on a given model, you may use observers to group all of your listeners into a single class. Observer classes have method names which reflect the Eloquent events you wish to listen for. Each of these methods receives the affected model as their only argument. The make:observer Artisan command is the easiest way to create a new observer class:

php artisan make:observer UserObserver --model=User

This command will place the new observer in your app/Observers directory. If this directory does not exist, Artisan will create it for you. Your fresh observer will look like the following:

<?php

namespace App\Observers;

use App\Models\User;

class UserObserver
{
    /**
     * Handle the User "created" event.
     */
    public function created(User $user): void
    {
        // ...
    }

    /**
     * Handle the User "updated" event.
     */
    public function updated(User $user): void
    {
        // ...
    }

    /**
     * Handle the User "deleted" event.
     */
    public function deleted(User $user): void
    {
        // ...
    }

    /**
     * Handle the User "restored" event.
     */
    public function restored(User $user): void
    {
        // ...
    }

    /**
     * Handle the User "forceDeleted" event.
     */
    public function forceDeleted(User $user): void
    {
        // ...
    }
}

To register an observer, you may place the ObservedBy attribute on the corresponding model:

use App\Observers\UserObserver;
use Illuminate\Database\Eloquent\Attributes\ObservedBy;

#[ObservedBy([UserObserver::class])]
class User extends Authenticatable
{
    //
}

Or, you may manually register an observer by invoking the observe method on the model you wish to observe. You may register observers in the boot method of your application's AppServiceProvider class:

use App\Models\User;
use App\Observers\UserObserver;

/**
 * Bootstrap any application services.
 */
public function boot(): void
{
    User::observe(UserObserver::class);
}

[!NOTE]
There are additional events an observer can listen to, such as saving and retrieved. These events are described within the events documentation.

Observers and Database Transactions

When models are being created within a database transaction, you may want to instruct an observer to only execute its event handlers after the database transaction is committed. You may accomplish this by implementing the ShouldHandleEventsAfterCommit interface on your observer. If a database transaction is not in progress, the event handlers will execute immediately:

<?php

namespace App\Observers;

use App\Models\User;
use Illuminate\Contracts\Events\ShouldHandleEventsAfterCommit;

class UserObserver implements ShouldHandleEventsAfterCommit
{
    /**
     * Handle the User "created" event.
     */
    public function created(User $user): void
    {
        // ...
    }
}

Muting Events

You may occasionally need to temporarily "mute" all events fired by a model. You may achieve this using the withoutEvents method. The withoutEvents method accepts a closure as its only argument. Any code executed within this closure will not dispatch model events, and any value returned by the closure will be returned by the withoutEvents method:

use App\Models\User;

$user = User::withoutEvents(function () {
    User::findOrFail(1)->delete();

    return User::find(2);
});

Saving a Single Model Without Events

Sometimes you may wish to "save" a given model without dispatching any events. You may accomplish this using the saveQuietly method:

$user = User::findOrFail(1);

$user->name = 'Victoria Faith';

$user->saveQuietly();

You may also "update", "delete", "soft delete", "restore", and "replicate" a given model without dispatching any events:

$user->deleteQuietly();
$user->forceDeleteQuietly();
$user->restoreQuietly();

快速入门 12.x 12.x 11.x 10.x 9.x 8.5 8.x 7.x 6.x 5.8 5.7 5.6 5.5 5.4 5.3 5.2 5.1

Eloquent: 快速入门

简介

生成模型类

模型检查

Eloquent 模型约定

表名

主键

「复合」主键

UUID 与 ULID 键

Timestamps

Database Connections

Default Attribute Values

Configuring Eloquent Strictness

Retrieving Models

Building Queries

Refreshing Models

Collections

Chunking Results

Chunking Using Lazy Collections

Cursors

Advanced Subqueries

Subquery Selects

Subquery Ordering

Retrieving Single Models / Aggregates

Not Found Exceptions

Retrieving or Creating Models

Retrieving Aggregates

Inserting and Updating Models

Inserts

Updates

Mass Updates

Examining Attribute Changes

Mass Assignment

Mass Assignment and JSON Columns

Allowing Mass Assignment

Mass Assignment Exceptions

Upserts

Deleting Models

Deleting an Existing Model by its Primary Key

Deleting Models Using Queries

Soft Deleting

Restoring Soft Deleted Models

Permanently Deleting Models

Querying Soft Deleted Models

Including Soft Deleted Models

Retrieving Only Soft Deleted Models

Pruning Models

Mass Pruning

Replicating Models

Query Scopes

Global Scopes

Generating Scopes

Writing Global Scopes

Applying Global Scopes

Anonymous Global Scopes

Removing Global Scopes

Local Scopes

Utilizing a Local Scope

Dynamic Scopes

Pending Attributes

Comparing Models

Events

Using Closures

Observers

Defining Observers

Observers and Database Transactions

Muting Events

Saving a Single Model Without Events

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