Doctrine ManyToMany: removing an object

Question

I have got problem with unidirectional ManyToMany relationship in Doctrine. The case is very easy: Product has many Tags. Tag can be attached to Product but also to any \"taggab

Answer 1

Ok, I managed myself by digging in Doctrine2 docs ;) Solution is to add onDelete="cascade" to @JoinColumn.

/**
 * @Entity 
 * @Table(name="products")
 **/
class Product {

    /** some other fileds here */

    /**
     * @ManyToMany(targetEntity="Tag")
     * @JoinTable(name="products_tags",
     *      joinColumns={@JoinColumn(name="product_id", referencedColumnName="id", onDelete="cascade")},
     *      inverseJoinColumns={@JoinColumn(name="tag_id", referencedColumnName="id", onDelete="cascade")}     
     *      )
     */
    protected $tags;

}

Note that, cascade={"all"} is managed on object level (in your app), while onDelete="cascade" is on database level.