关键词：Laravel Eloquent

Attempting to use whereHas queries with standard Eloquent polymorphic relationships will fail, due to Eloquent being unable to determine the correct model to retrieve. The 'Improved Polymorphic Eloquent Builder' is a class which extends the Eloquent Builder class that is built in to Laravel 5.1. It enables limited use of the whereHas method to query Eloquent polymorphic relationships.