Laravel: Eager loading with local scope - php

Question

I have a Coupon model in a Many to Many relation with a Product model (with pivot table and so on...). I created some local scope to get only available coupons, and to get only coupons of determined category:
public function scopeAvailable($query)
{
return $query->where('available', '>', 0);
}
public function scopeOfCategory($query, $category)
{
return $query->join('categories', 'categories.id', '=', 'coupons.category_id')
->where('categories.slug', $category);
}
I want to eager load all available coupons of some category with their respective products. So I'm doing:
$coupons = Coupon::with('products')->available()->ofCategory($category)->paginate(20);
If I call $coupons->first(), I can see the information about the coupon. But if I call $coupons->first()->products I get an empty array.
If I comment the ->ofCategory($category) part, it works as expected.
Here is my Models:
class Coupon extends Model
{
public function products()
{
return $this->belongsToMany('App\Product');
}
...
}
class Product extends Model
{
public function coupons()
{
return $this->belongsToMany('App\Coupon');
}
...
}
I'm using Laravel 5.2. What am I doing wrong?
Edit:
It looks like a problem with my Category. If I try to get coupons on "other" category, I got my coupon as expected. If I try to get coupons on "electronics" category, I got a coupon with no products. I'm pretty sure I have coupons with products both on "electronics" and "other" categories.
If I dump Category::where('slug', '=', 'electronics')->first():
...
protected 'attributes' =>
array (size=3)
'id' => int 1
'name' => string 'Electronics' (length=11)
'slug' => string 'electronics' (length=11)
...
If I dump Category::where('slug', '=', 'other')->first():
...
protected 'attributes' =>
array (size=3)
'id' => int 2
'name' => string 'Other' (length=5)
'slug' => string 'other' (length=5)
...
Edit 2:
I created another coupons with "other" category, so I have two coupons with this category. When I print the coupons, it shows the first coupon twice.

Answer 1

Table coupons:
| id | name | available | category_id |
|----|------------|-----------|-------------|
| 1 | Coupon #1 | 1 | 1 |
| 2 | Coupon #2 | 1 | 1 |
| 3 | Coupon #3 | 1 | 1 |
Table products:
| id | name |
|----|-------------|
| 1 | Product #1 |
| 2 | Product #2 |
| 3 | Product #3 |
Table coupon_product:
| id |product_id| coupon_id |
|----|----------|-----------|
| 1 | 1 | 1 |
| 2 | 2 | 1 |
Table categories:
| id | slug |
|----|-------------|
| 1 | category-1 |
| 2 | category-2 |
| 3 | category-3 |
Product.php:
use Illuminate\Database\Eloquent\Model;
class Product extends Model
{
public function coupons()
{
return $this->belongsToMany('App\Coupon');
}
}
Coupon.php:
class Coupon extends Model
{
public function products()
{
return $this->belongsToMany('App\Product');
}
public function scopeAvailable($query)
{
return $query->where('available', '>', 0);
}
public function scopeOfCategory($query, $category)
{
return $query->join('categories', 'categories.id', '=', 'coupons.category_id')
->where('categories.slug', $category);
}
}
And finally when I run:
$coupons = App\Coupon::with('products')->available()->ofCategory('funny')->first();
dd($coupons->products);
I get this:
Which is correct. Can you post more detailed info about your current state of the project?