Group Laravel Eloquent pivot values by id - php

Question

I have a relational database whose models look like this:
Restaurant:
class Restaurant extends Authenticatable
{
public function dishes()
{
// return $this->hasMany(Dish::class);
return $this->belongsToMany('App\Models\Dish');
}
}
Dish:
class Dish extends Model
{
public function orders()
{
return $this->belongsToMany('App\Models\Order')->withPivot('quantity');
}
public function restaurant()
{
return $this->belongsToMany('App\Models\Restaurant');
}
}
Order
class Order extends Model
{
public function dishes()
{
return $this->belongsToMany('App\Models\Dish');
}
}
I'm retrieving all orders belonging to the restaurant by id like so:
public function index($id)
{
$user_id = $id;
$dishes = Dish::where('restaurant_id', $user_id)->get();
foreach ($dishes as $dish => $value) {
$orders = $value->orders;
foreach ($orders as $order => $value) {
$response[] = $value;
}
}
return response()->json($response);
}
This works, but I would like to group these results by order_id in some way, so that I get returned something similar to this:
{
"id": 28,
"status": 1,
"address": "Fish Street",
"user_name": "Artyom",
"user_surname": "Pyotrovich",
"phone": "351 351 643 52",
"email": "artyom#restaurant.com",
"total": 35.8,
"created_at": "2021-11-17T10:44:58.000000Z",
"updated_at": "2021-11-17T10:44:58.000000Z",
"dishes": [{
"dish_id": 22,
"quantity": 3
},
{
"dish_id": 23,
"quantity": 1
}]
}
Is this possible by simply changing the Eloquent query or do I need to perform several operations on the result of my current query? Also interested in what is actually the best practice in these cases.
Thanks in advance

Answer 1

You can use the ::with() method to get all the desired relations, this is much cleaner then a foreach rewrite.
Example:
$orders = Order::with('dishes')
->whereHas('dishes', function(Builder $dishes) use ($user_id) {
$dishes->where('restaurant_id', $user_id);
})->get();
return response()->json( $order );
Small note:
Separate the user id from the restaurant id, what if the user has multiple restaurants?