Select from select using Laravel eloquent - sql

Question

I want to get all user's favourite products. The query should be like this:
SELECT *
FROM products
WHERE id IN (SELECT id FROM favourites WHERE user_id == Auth::id())
How can I query with eloquent?

Answer 1

You're trying to achieve something like this:
In the oficial documentation you can find the explanation of Advanced where clauses
DB::table('products')
->whereIn('id', function($query)
{
$query->select('id')
->from('favourites')
->where('favourites.user_id', Auth::id());
})
->get()
The final result will be (you can see this dumping the query using toSql() method instead of get()) :
select * from `products` where `id` in (select `id` from `favourites` where `favourites`.`user_id` = ?)

Answer 2

What do you mean to saying "How can I do it"? Are you asking how to structure it or how to query with eloquent?
If you asking the query:
Product::whereIn('id', Favourite::select('id')->whereUserId(Auth::id())->get()->toArray())->get();
should work.
If you asking structure, you should define relations in models.
On User model;
public function favourites()
{
return $this->hasMany(Favourite::class, 'user_id');
}
and on Favourite model;
public function favoriteProduct()
{
return $this->belongsTo(Product::class, '[the product_id column on favourites table]');
}
and then you can access like;
$userFavourites = User::with('favourites.favoriteProduct')->whereId(Auth::id())->favourites;
on your view:
#foreach($userFavourites as $userFavourite)
{{ $userFavourite->favouriteProduct }}
#endforeach
this is the simplest. on the other hand; you can use Has Many Through relationship.
And this would be the cleanest way.