laravel-5

Eloquent: Relationships 579
12 public function comments()
13 {
14 return $this->hasMany('App\Comment');
15 }
16 }
Remember, Eloquent will automatically determine the proper foreign key column on the Comment
model. By convention, Eloquent will take the “snake case” name of the owning model and suffix
it with _id. So, for this example, Eloquent will assume the foreign key on the Comment model is
post_id.
Once the relationship has been defined, we can access the collection of comments by accessing
the comments property. Remember, since Eloquent provides “dynamic properties”, we can access
relationship functions as if they were defined as properties on the model:
1 $comments = App\Post::find(1)->comments;
2
3 foreach ($comments as $comment) {
4 //
5 }
Of course, since all relationships also serve as query builders, you can add further constraints to
which comments are retrieved by calling the comments method and continuing to chain conditions
onto the query:
1 $comments = App\Post::find(1)->comments()->where('title', 'foo')->first();
Like the hasOne method, you may also override the foreign and local keys by passing additional
arguments to the hasMany method:
1 return $this->hasMany('App\Comment', 'foreign_key');
2
3 return $this->hasMany('App\Comment', 'foreign_key', 'local_key');