Symfony Doctrine : How to have multiple hierarchical data in 1 table but with the logic splitted into X models.

Fixtures.yml

Category:
  collection_0:
    name: Collection
    root_id: 1 
    children:
      collection_1:
        name: Spring 2010
        summary:
      collection_2:
        name: Summer 2010
        summary:
      collection_3:
        name: Fall 2010
        summary:
      collection_4:
        name: Winter 2010
        summary:

  type_0:
    name: Type
    root_id: 2 # type
    children:
      type_1:
        name: Boucles d'oreille
        summary:
      type_2:
        name: Bagues
        summary:
      type_3:
        name: Broches
        summary:
      type_4:
        name: Colliers
        summary:

Schema.yml

Category:
  tableName: category
  actAs:
    NestedSet:
      hasManyRoots:   true
      rootColumnName: root_id
    Sluggable:
      unique:    true
      fields:    [name]
      canUpdate: true
      name:      slug
      type:      string
      length:    255
  columns:
    id:
      type:          integer
      primary:       true
      autoincrement: true
    name:
      type:    string(100)
      notnull: true
    summary:
      type:    string(140)
      notnull: false

Collection:
  inheritance:
    type:     column_aggregation
    extends:  Category
    keyField: root_id
    keyValue: 1

Type:
  inheritance:
    type:     column_aggregation
    extends:  Category
    keyField: root_id
    keyValue: 2