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** Branch linked: lp:openobject-server/6.1

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https://bugs.launchpad.net/bugs/1013566

Title:
  Inherit a Model from an AbstractModel has _auto=False

Status in OpenERP Server:
  Fix Released

Bug description:
  Hello,

  It seems that there is a small issue when we use an AbstractModel.
  By the way, I'm not sure if it is really destined to be used as I'm not able to find any usage in addons.
  It's a pity because it allows to really modularize some things.

  As instance, I tried to create a model with the "sequence"
  responsibility :

  class Sequencable(AbstractModel):

      _name = 'abstract.sequencable'

      _order = 'sequence'

      _columns = {
          'sequence': fields.integer('Sequence')
      }

      _defaults = {
          'sequence': 1000
      }

  Then, in the models where I want a sequence, I just have to inherit
  from 'abstract.sequencable'.

  class ModelA(Model):

      _name = 'model.a'
      _inherit = ['abstract.sequencable', 'other.inheritance']

      _columns = {...}

  class ModelB(TransientModel):
      # please ignore the non-sense of a sequence on a TransientModel, I put it just because the problem explained below happens on Model and TransientModel 
      _name = 'model.b'
      _inherit = 'abstract.sequencable'

      _columns = {...}

  First, do you see any reason not to do that ?

  The once issue I've encountered is that _auto is set to False in
  AbstractModel, and is not set to True in Model and TransientModel

  In orm.py with some cuts :
  class AbstractModel(BaseModel):
      _auto = False # don't create any database backend for AbstractModels
      _register = False # not visible in ORM registry, meant to be python-inherited only

  class Model(BaseModel):
      _register = False # not visible in ORM registry, meant to be python-inherited only
      _transient = False # True in a TransientModel

  So as a result, I have to declare _auto = True in every materialized models; for my model.a it gives:
  class ModelA(Model):

      _name = 'model.a'
      _inherit = ['abstract.sequencable', 'other.inheritance']
  +    _auto = True

      _columns = {...}

  As Model and TransiantModel are supposed to be concrete models, I
  think that they have to be _auto = True by default even if they are
  "_inherit"-ing an AbstractModel.

  So the base model classes would be (without docstrings):
  class Model(BaseModel):
      _register = False # not visible in ORM registry, meant to be python-inherited only
      _transient = False # True in a TransientModel
      _auto = True # create database backend for Models

  class TransientModel(BaseModel):
      _register = False # not visible in ORM registry, meant to be python-inherited only
      _transient = True
      _auto = True # create database backend for TransientModels

  class AbstractModel(BaseModel):
      _auto = False # don't create any database backend for AbstractModels
      _register = False # not visible in ORM registry, meant to be python-inherited only

  Do you agree with that ?

  Thanks
  Guewen

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