laravel-5

Eloquent: Relationships 456
Typical Eloquent foreign key conventions will be used when performing the relationship’s queries. If
you would like to customize the keys of the relationship, you may pass them as the third and fourth
arguments to the hasManyThrough method. The third argument is the name of the foreign key on the
intermediate model, while the fourth argument is the name of the foreign key on the final model.
.
1 class Country extends Model
2 {
3 public function posts()
4 {
5 return $this->hasManyThrough('App\Post', 'App\User', 'country_id', 'user\
6 _id');
7 }
8 }
Polymorphic Relations
Table Structure
Polymorphic relations allow a model to belong to more than one other model on a single association.
For example, imagine you want to store photos for your staff members and for your products. Using
polymorphic relationships, you can use a single photos table for both of these scenarios. First, let’s
examine the table structure required to build this relationship:
.
1 staff
2 id - integer
3 name - string
4
5 products
6 id - integer
7 price - integer
8
9 photos
10 id - integer
11 path - string
12 imageable_id - integer
13 imageable_type - string
Two important columns to note are the imageable_id and imageable_type columns on the photos
table. The imageable_id column will contain the ID value of the owning staff or product, while