How to retrieve entities by conditioning all their ManyToMany relations? - php

Question

The context
I'm working on an online shop. Every Product on the website can have several ProductVariations (e. g. size, color, ...) which values are a list of ProductVariationValue (e. g. XL, L, Blue, Red, ...).
Each ProductVariationValue is bound to a ProductVariation (e. g. you can't choose Red for Size).
I'm trying to create a stock management system which tracks the amount of in-stock (Product, ProductVariations, ProductVariationValues) combination.
Product <--> ProductVariation <--> ProductVariationValue
I've managed to do it by creating a Stock entity holding a Product and a collection of ProductVariationValues:
/** #ORM\Entity */
public class Stock
{
// ...
/** #ORM\ManyToOne(targetEntity="AcmeDemoBundle:Product") */
protected $product;
/** #ORM\ManyToMany(targetEntity="AcmeDemoBundle:ProductVariationValues") */
protected $productVariationValues;
/** #ORM\Column(type="integer") */
protected $number = 0;
// ...
}
When the user adds a Product to his cart, I create an instance of OrderItem which holds the ProductVariationValues they selected:
/** #ORM\Entity */
public class OrderItem
{
// ...
/** #ORM\ManyToOne(targetEntity="AcmeDemoBundle:Product") */
protected $product;
/** #ORM\ManyToMany(targetEntity="AcmeDemoBundle:ProductVariationValues") */
protected $productVariationValues;
// ...
}
The problem
I understand the Stock entity is similar to the OrderItem entity. However, when the user adds a Product to his cart, and I'm building the OrderItem entity, I cannot find how to retrieve the Stock instance to check whether the Product with its ProductVariationValues are in stock, because I can't find which relation to add in the Stock entity.
Indeed, the Stock entity cannot be identified by the $product or $productVariationValues relations by themselves: they need to be put together.
What I've tried to do
In the controller, given the $product and an array of $productVariationValues, the user selected, I've tried to set up a query to retrieve the Stock instance.
class StockRepository
{
public function retrieveStock($product, $productVariationValues)
{
$this->getQueryBuilder('s')
->leftJoin('s.product', 'p')
->leftJoin('s.productVariationValues', 'pvv')
->where('s.product = ?')
->andWhere('s.productVariationValues = ?')
->setParameter(1, $product)
->setParameter(2, $productVariationValues);
// ...
}
}
This code does not work as the setParameter() method can not accept array or ArrayCollection parameters.
Either way, this solution would not be optimal as this code must be run from the controller and I wouldn't be able to run it from the OrderItem entity.
Is my entity model wrong? Is there a simple way to add a Stock relation in my OrderItem class? Or at least to retrieve a Stock item, given its Product and ProductVariationValues?

Answer 1

You need to use an IN clause, and iterate over all the values; something like:
class StockRepository
{
public function retrieveStock($product, $productVariationValues)
{
$qb=$this->getQueryBuilder('s');
$qb->leftJoin('s.product', 'p')
->leftJoin('s.productVariationValues', 'pvv')
->where('s.product = ?')
->setParameter(1, $product)
;
$stockVariationValues=$qb->getQuery()-
>getSingleResult()->getProductVariationValues();
$qb=$this->getQueryBuilder('s');
$qb->leftJoin('s.product', 'p')
->leftJoin('s.productVariationValues', 'pvv')
->where('s.product = ?')
->setParameter(1, $product)
;
$stockVariationValues->map(function ($element) use ($qb){
$qb->andWhere($qb->expr()
->in('s.productVariationValues'
, "'".implode(","
,$productVariationValues->toArray())
."'")
);
});
// ...
}
}