[Bug 996816] Re: using _inherit and _name for a class is not modular

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[Bug 996816] Re: using _inherit and _name for a class is not modular

qdp (OpenERP)
maintenance and OPW? really?

For your information, the place where we (odoo) were facing this problem
is not existing anymore in v8, since the new WMS remove the extra
stock.picking.XXX class.

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https://bugs.launchpad.net/bugs/996816

Title:
  using _inherit and _name for a class is not modular

Status in Odoo Server:
  Confirmed

Bug description:
  If you define a class that use _inherit and _name, to make a copy of
  the parent class, you expect that any modification made by a tier
  module is applied to both the parent and the copy classes. But it's
  not the case and here are the steps to help you to figure it out:

  1°) My aim is to use a copy of the stock.picking class for incoming shipments, it will allow me to simplify the code a lot (especially in the views definition). So i defined a class stock.picking.in as follow (stock/stock.py):
  class stock_picking_in(osv.osv):
      _inherit= 'stock.picking'
      _name='stock.picking.in'
      _table='stock_picking'    #(here the copy model is using the same table as the parent, but it's not relevant for the bug description, and the same apply if the table is different)
      ...

  2°) in purchase module, i changed the one2many field on the purchase order that referred to the stock_picking table. What i need to do is to reference the class stock.picking.in, instead of the stock.picking.  So i defined it as follow (purchase/purchase.py, line 176):
         'picking_ids': fields.one2many('stock.picking.in', 'purchase_id', 'Picking List', readonly=True, help="This is the list of incoming shipments that have been generated for this purchase order."),

  3°) the purchase module already include some code to add the field purchase_id on the stock.picking class and table (purchase/stock.py):
   37 class stock_picking(osv.osv):
   38     _inherit = 'stock.picking'
   39     _columns = {
   40         'purchase_id': fields.many2one('purchase.order', 'Purchase Order',
   41             ondelete='set null', select=True),
   42     }

  So i thought it would be ok like this... But, no it isn't. At the
  purchase module installation a traceback is telling me that the field
  purchase_id doesn't exists on the stock.picking.in model. The addition
  of it on stock.picking didn't propagate to my class.

  This is really problematic because it means that using _inherit and
  _name on the same class is not modular.

  *Note that, in the meanwhile this bug is solved (if it will be) i this used a workaround: i just copied the add of the purchase_id field on my new stock.picking.in class too, in this way (purchase/stock.py):
  129 # Redefinition of the new field in order to update the model stock.picking.in in the orm
  132 class stock_picking_in(osv.osv):
  133     _inherit = 'stock.picking.in'
  134     _columns = {
  135         'purchase_id': fields.many2one('purchase.order', 'Purchase Order',
  136             ondelete='set null', select=True),
  137     }
  So yeah, it works but it's not convenient. If we want to use more and more this feature we should improve its modularity. Please be kind and remove this hack[*] whenever the framework support this feature.

  Thanks,
  Quentin

 
  [*]: the same applies for the sale module, of course. Lines to remove when it's fixed are in sale/stock.py
  189 # Redefinition of the new field in order to update the model stock.picking.out in the orm
  192 class stock_picking_out(osv.osv):
  193     _inherit = 'stock.picking.out'
  194     _columns = {
  195         'sale_id': fields.many2one('sale.order', 'Sale Order',
  196             ondelete='set null', select=True),
  197     }

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