djCategory:
  actAs:
    NestedSet:
      hasManyRoots: true
      rootColumnName: root_id
  columns:
    ...
  relations:
    djProduct:
      foreignAlias: Categories
      alias: Products
      class: djProduct
      refClass: djCategoryProduct

==================
djCategoryProduct:
  columns:
    dj_category_id: { type: integer, notnull: true }
    dj_product_id: { type: integer, notnull: true }
  relations:
    djCategory:
      foreignAlias: CategoryProduct
      onDelete:     cascade
    djProduct:
      foreignAlias: CategoryProduct
      onDelete:     cascade
======================

djProduct:
  actAs:
    Timestampable: ~
    I18n:
      fields: [ name, description, price, promotion_price ]
      actAs:
        Sluggable:
          unique: true
          fields: [name]
          canUpdate: true
  columns:
    name:             { type: string(255), notnull: true }
    description:      { type: blob }
    ...