记 Laravel 模型 deleted 事件未被触发领悟

free-andy 的个人博客 / 3 / 9 / 创建于 7年前 / 更新于 6年前

给模型绑定了观察器,注册了deleted事件,预计以下代码会被触发

User::where('id', 1)->delete();

然而理想是美好的,现实是残酷的,仔细检查了流程, 感觉Perfect,最终几经波折找到如下攻略
file
总结如下
敲黑板! 检索了模型实例的操作才会被触发

// 这样是不行的
User::where('id', 1)->delete();
// 这样是可行的
$user = User::find(1);
$user->delete();
// 或者
User::destroy(1);
User::destroy([1, 2]);

还是文档啃少了!

本作品采用《CC 协议》，转载必须注明作者和本文链接

你迷茫的原因大多数是因为，想得多，做得少

本帖由系统于 7年前自动加精

free-andy

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lx1036

LaraDinner 01 633 声望

$user = User::find(1);
$user->delete();

这个是调用 \Illuminate\Database\Eloquent\Model:delete() 方法，源码里写了会在 delete 前后触发 deleting 和 deleted 事件，源码是：

public function delete()
    {
        if (is_null($this->getKeyName())) {
            throw new Exception('No primary key defined on model.');
        }

        // If the model doesn't exist, there is nothing to delete so we'll just return
        // immediately and not do anything else. Otherwise, we will continue with a
        // deletion process on the model, firing the proper events, and so forth.
        if (! $this->exists) {
            return;
        }

        if ($this->fireModelEvent('deleting') === false) {
            return false;
        }

        // Here, we'll touch the owning models, verifying these timestamps get updated
        // for the models. This will allow any caching to get broken on the parents
        // by the timestamp. Then we will go ahead and delete the model instance.
        $this->touchOwners();

        $this->performDeleteOnModel();

        // Once the model has been deleted, we will fire off the deleted event so that
        // the developers may hook into post-delete operations. We will then return
        // a boolean true as the delete is presumably successful on the database.
        $this->fireModelEvent('deleted', false);

        return true;
    }

而

User::where('id', 1)->delete();

调用的是 Illuminate\Database\Eloquent\Builder::delete()，然后调用 Illuminate\Database\Query\Builder::delete() ，源码里没有加上事件，直接删除数据了，Illuminate\Database\Query\Builder::delete() 源码是：

public function delete($id = null)
    {
        // If an ID is passed to the method, we will set the where clause to check the
        // ID to let developers to simply and quickly remove a single row from this
        // database without manually specifying the "where" clauses on the query.
        if (! is_null($id)) {
            $this->where($this->from.'.id', '=', $id);
        }

        return $this->connection->delete(
            $this->grammar->compileDelete($this), $this->cleanBindings(
                $this->grammar->prepareBindingsForDelete($this->bindings)
            )
        );
    }

文档仅是源码的介绍，还得看源码怎么写的。。

7年前评论