MySQL (Laravel Eloquent) - Get record when two columns have two or more values at the same time

I have this database that I got from this post that manages products and its variants:

+---------------+     +---------------+
| PRODUCTS      |-----< PRODUCT_SKUS  |
+---------------+     +---------------+
| #product_id   |     | #product_id   |
|  product_name |     | #sku_id       |
+---------------+     |  sku          |
        |             |  price        |
        |             +---------------+
        |                     |
+-------^-------+      +------^------+
| OPTIONS       |------< SKU_VALUES  |
+---------------+      +-------------+
| #product_id   |      | #product_id |
| #option_id    |      | #sku_id     |
|  option_name  |      | #option_id  |
+---------------+      |  value_id   |
        |              +------v------+
+-------^-------+             |
| OPTION_VALUES |-------------+
+---------------+
| #product_id   |
| #option_id    |
| #value_id     |
|  value_name   |
+---------------+

The problem is, that I don't know how would I get the SKU at the moment that a user selects the options of the product he wants:

SKU_VALUES
==========
product_id sku_id option_id value_id
---------- ------ --------- --------
1          1      1         1        (W1SSCW; Size; Small)
1          1      2         1        (W1SSCW; Color; White)
1          2      1         1        (W1SSCB; Size; Small)
1          2      2         2        (W1SSCB; Color; Black)

Let's suppose that the user selects the product with ID 1 and the options size-small and color-black, how am I able to get the sku_id (in this case I would want value 2 from sku_id) in order to get the price that's inside the PRODUCT_SKUS table.

I cannot do something like this for obvious reasons:

SELECT sku_id FROM SKU_VALUES 
WHERE (SKU_VALUES.option_id = 1 AND SKU_VALUES.value_id = 1) 
AND (SKU_VALUES.option_id = 2 AND SKU_VALUES.value_id = 2)

NOTE that it seems that I would need to append the same number of conditions (or whatever I need) as the number of options that are available from a product, in this case there are just 2 rows because the product has 2 options (size and color), but the product may have "n" options.

I would appreciate if someone could guide me for this query and if it's possible doing it with Laravel Eloquent instead of using RAW query.

The models I have created are the following:

"Product" Model:

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Producto extends Model
{
    protected $table = 'productos';

    protected $fillable = [
        'nombre',
        'descripcion'

    ];

public function opciones(){
    return $this->hasMany('App\Models\OpcionProducto', 'producto_id');
}

public function skus(){
    return $this->hasMany('App\Models\ProductoSku', 'producto_id');
}
}

"Options" Model:

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

use App\Traits\HasCompositePrimaryKey;

class OpcionProducto extends Model
{
    use HasCompositePrimaryKey;

    protected $table = 'productos_opciones';

    protected $primaryKey = array('producto_id', 'opcion_id');

    protected $fillable = [
        'producto_id',
        'opcion_id',
        'nombre_opcion',
        'valor'
    ];


    public function producto(){
        return $this->belongsTo('App\Models\Producto', 'producto_id');
    }

    public function valores(){
        return $this->hasMany('App\Models\OpcionValorProducto', 'opcion_id', 'opcion_id');
    }

    public function skusValores(){
        return $this->hasMany('App\Models\SkuValor', 'opcion_id', 'opcion_id');
    }
}

"OptionValues" Model:

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

use App\Traits\HasCompositePrimaryKey;

class OpcionValorProducto extends Model
{
    use HasCompositePrimaryKey;

    protected $primaryKey = array('producto_id', 'opcion_id', 'valor_id');

    protected $table = 'productos_opciones_valores';

    protected $fillable = [
        'producto_id',
        'opcion_id',
        'valor_id',
        'valor_variacion',
        'valor'
    ];


    public function producto(){
        return $this->belongsTo('App\Models\Producto', 'producto_id');
    }

    public function opcion(){
        return $this->belongsTo('App\Models\OpcionProducto', 'opcion_id', 'opcion_id');
    }
}

"Product_SKUS" model:

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

use App\Traits\HasCompositePrimaryKey;

class ProductoSku extends Model
{
    use HasCompositePrimaryKey;

    protected $primaryKey = array('producto_id', 'sku_id');

    protected $table = 'productos_skus';

    protected $fillable = [
        'producto_id',
        'sku_id',
        'imagen_id',
        'precio',
        'stock',
        'sku'
    ];


    public function producto(){
        return $this->belongsTo('App\Models\Producto', 'producto_id');
    }

    public function valoresSku(){
        return $this->hasMany('App\Models\SkuValor', 'sku_id');
    }

    }
}

"SKU_VALUES" model:

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

use App\Traits\HasCompositePrimaryKey;

class SkuValor extends Model
{
    use HasCompositePrimaryKey;

    protected $primaryKey = array('producto_id', 'sku_id', 'opcion_id');

    protected $table = 'valores_skus';

    protected $fillable = [
        'producto_id',
        'sku_id',
        'opcion_id',
        'valor_id',
    ];


    public function producto(){
        return $this->belongsTo('App\Models\Producto', 'producto_id');
    }

    public function opcion(){
        return $this->belongsTo('App\Models\OpcionProducto', 'opcion_id', 'opcion_id');
    }

    public function sku(){
        return $this->belongsTo('App\Models\ProductoSku', 'sku_id', 'sku_id');
    }
}

Original post from: https://stackoverflow.com/questions/61803433/mysql-laravel-eloquent-get-record-when-two-columns-have-two-or-more-values-a by (Aarón Gutiérrez)

Answers:

After going through your question, this is the code I came up with. Of course this is un-tested. Please give this a shot.

$skuValor = SkuValor::with('producto', 'opcion.valores', 'sku')
    ->whereHas('producto', function ($q) use ($request) {
        $q->where('id', $request->get('product_id')); // id: 1
    })
    ->whereHas('opcion', function ($q) use ($request) {
        $q->whereIn('id', $request->get('option_ids')) // id: [1, 2] where 1=size, 2=color
        ->whereHas('valores', function($q2) use ($request) {
            $q2->whereIn('id', $request->get('value_ids')); // id: [1, 3] where 1=small, 3=pink
        });
    })
    ->get();

$skuValor->sku->id; // sky id

with() : This is called Eager Loading. Load some relationships when retrieving a model.

whereHas() : Querying Relationship Existence. This method allow you to add customized constraints to a relationship constraint.

use() : Passing data so that inner (that particular) query can use it. Notice we have used 1 for opcion and another one for valores.

whereIn() : This method verifies that a given column's value is contained within the given array.

Comment if you get stuck.

Answer by: Digvijay