How can I use whereHas in the morphTo relation laravel? - laravel

Question

My product model like this :
<?php
...
class Product extends Model
{
...
protected $fillable = ['name','photo','description',...];
public function favorites(){
return $this->morphMany(Favorite::class, 'favoritable');
}
}
My favorite model like this :
<?php
...
class Favorite extends Model
{
...
protected $fillable = ['user_id', 'favoritable_id', 'favoritable_type'];
public function favoritable()
{
return $this->morphTo();
}
}
My laravel eloquent like this :
$q = $param['q'];
$query = Favorite->where('user_id', auth()->user()->id)
->with('favoritable');
if($q) {
$query->whereHas('favoritable', function ($query) use ($q) {
$query->where('name', 'like', "%$q%");
});
}
$query = $query->paginate(5);
return $query
If the script executed, there exist error like this :
Unknown column 'name'
How can I solve this problem?

Answer 1

Laravel 5.8 include new features for querying polymorphic relations.
The whereHasMorph() make it possible to query polymorphic relationships with something like the following:
Comment::whereHasMorph('commentable', [Post::class, Video::class], function($query){
$query->where('title', 'foo');
})->get();
Which produces following query:
select * from "comments"
where (
(
"commentable_type" = 'App\Post' and exists (
select * from "posts"
where "comments"."commentable_id" = "posts"."id" and "title" = 'foo'
)
) or (
"commentable_type" = 'App\Video' and exists (
select * from "videos"
where "comments"."commentable_id" = "videos"."id" and "title" = 'foo'
)
)
)

Answer 2

Solved
I add this method :
public function product()
{
return $this->belongsTo(Product::class, 'favoritable_id')
->where('favorites.favoritable_type', Product::class);
}
in favorite model
And I change the laravel eloquent to be like this :
$query->whereHas('product', function ($query) use ($q) {
$query->where('name', 'like', "%$q%");
});
It works