Symfony2 Много към много релационна Db структура

добре, пиша по друг начин:

use може да използва това съпоставяне:

Филм:

Movie:
    type: entity
    table: movie
    id:
        id:
            type: integer
            generator: { strategy: AUTO }
    fields:
        title: ~
        createdAt:
            type: datetime
    oneToMany:
        roles:
            targetEntity: Role
            mappedBy: movie

Изпълнител:

Artist:
    type: entity
    table: artist
    id:
        id:
            type: integer
            generator: { strategy: AUTO }
    fields:
        fname: ~
        lname: ~
        birthDate:
            type: datetime
        #other fields for this entity

Роля:

Role:
    type: entity
    table: role
    id:
        id:
            type: integer
            generator: { strategy: AUTO }
    fields:
        name: ~

    manyToMany:
        artist:
            targetEntity: Artist

    manyToOne:
        movie:
            targetEntity: Movie
            inversedBy: roles