App\Entity\User:
    type: entity
    repositoryClass: App\Entity\Repository\UserRepository
    table: user
    id:
        id:
            type: integer
            generator: { strategy: AUTO }
    fields:
        name:
            type: string
            length: 32
            unique: true
        password:
            type:  string
            length: 64

    oneToMany:
        heroes:
            targetEntity: Hero
            mappedBy: user
            cascade: ["persist", "merge"]