Question

I am trying to use query builder to select all the categories that belong to a certain superCategory (category and superCategory have a many to many relationship).

However, I am unable to build a correct query builder sentence because I don’t know how to reference to the superCategory from my categoryas there is no superCategory field inside my category ID.

The objects in the database look like :

Category:
  id
  name

SuperCategory
  id
  name

categories_superCategories
  id
  category_id
  superCategory_id

Here are the definition of my objects (yml files):

YOP\YourOwnPoetBundle\Entity\TraitCategory:
  type: entity
  repositoryClass: YOP\YourOwnPoetBundle\Repository\TraitCategoryRepository
  table: null
  fields:
    id:
      type: integer
      id: true
      generator:
        strategy: AUTO
    name:
      type: string
      length: '255'
  lifecycleCallbacks: {  }
  manyToMany:
    superCategories:
      targetEntity: SuperCategory
      joinTable:
        name: traitCategories_superCategories
        joinColumns:
          traitCategory_id:
            referencedColumnName: id
        inverseJoinColumns:
          superCategory_id:
            referencedColumnName: id

and

YOP\YourOwnPoetBundle\Entity\SuperCategory:
  type: entity
  repositoryClass: YOP\YourOwnPoetBundle\Repository\SuperCategoryRepository
  table: null
  fields:
    id:
      type: integer
      id: true
      generator:
        strategy: AUTO
    name:
      type: string
      length: '255'
  lifecycleCallbacks: {  }
  manyToMany:
    msgCategories:
      targetEntity: MsgCategory
      mappedBy: superCategories
    traitCategories:
      targetEntity: TraitCategory
      mappedBy: superCategories

How would I build a query builder sentence to get the categories that belong to a certain superCategory?

The query inside my CategoryRepository:

$this->createQueryBuilder('c')
            ->innerJoin( ?????? )
            ->setParameter('superCategoryName', $superCategoryName);

Answer 1

Got it :

public function findBySuperCategoryName($superCategoryName)
{
    return $this->createQueryBuilder('c')
            ->innerJoin('c.superCategories', 's', 'WITH', 's.name = :superCategoryName')
            ->setParameter('superCategoryName', $superCategoryName);
}

The problem was that I had to ask for c.superCategories and not c.superCategory !