Description
  ===========
  
  
  
  

  TODO

  ====
  
  Documentation
  -------------
  
  * add usage scenario

  * complete documentation to precise one level dependencies for create and find methods

  * clarify tree of rights
  * clarify why the dependencies need to be managed in the service (to avoid to break the

  CRUD model, *i.e.* repository methods are specialised to load the one-level 

  dependencies, thus cannot be used to load object as dependencies  

  Tests
  -----

  * tests for one-level dependencies