Add a failing test to reproduce #5398

openerp/addons/test_inherits/__init__.py

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+# -*- coding: utf-8 -*-
+from . import models

openerp/addons/test_inherits/__openerp__.py

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+# -*- coding: utf-8 -*-
+{
+    'name': 'test-inherits',
+    'version': '0.1',
+    'category': 'Tests',
+    'description': """A module to verify the inheritance using _inherits.""",
+    'author': 'Camptocamp',
+    'website': 'http://www.camptocamp.com',
+    'depends': ['base'],
+    'data': [
+        'ir.model.access.csv',
+        'demo_data.xml',
+    ],
+    'installable': True,
+    'auto_install': False,
+}

openerp/addons/test_inherits/demo_data.xml

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+<openerp>
+  <data>
+    <record id="unit_a" model="test.unit">
+      <field name="name">Unit A</field>
+      <field name="state">a</field>
+    </record>
+
+    <record id="box_a" model="test.box">
+      <field name="unit_id" ref="unit_a"/>
+      <field name="field_in_box">A</field>
+    </record>
+
+    <record id="pallet_a" model="test.pallet">
+      <field name="box_id" ref="box_a"/>
+      <field name="field_in_pallet">A</field>
+    </record>
+
+  </data>
+</openerp>

openerp/addons/test_inherits/ir.model.access.csv

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+"id","name","model_id:id","group_id:id","perm_read","perm_write","perm_create","perm_unlink"
+access_test_unit,access_test_unit,model_test_unit,,1,1,1,1
+access_test_box,access_test_box,model_test_box,,1,1,1,1
+access_test_pallet,access_test_pallet,model_test_pallet,,1,1,1,1

openerp/addons/test_inherits/models.py

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+# -*- coding: utf-8 -*-
+from openerp import models, fields, api, osv
+
+
+# We just create a new model
+class Unit(models.Model):
+    _name = 'test.unit'
+
+    _columns = {
+        'name': osv.fields.char('Name', required=True),
+        'state': osv.fields.selection([('a', 'A'), ('b', 'B')],
+                                      string='State'),
+    }
+
+    surname = fields.Char(compute='_compute_surname')
+
+    @api.one
+    @api.depends('name')
+    def _compute_surname(self):
+        self.surname = self.name or ''
+
+
+# We want to _inherits from the parent model and we add some fields
+# in the child object
+class Box(models.Model):
+    _name = 'test.box'
+    _inherits = {'test.unit': 'unit_id'}
+
+    unit_id = fields.Many2one('test.unit', 'Unit', required=True,
+                              ondelete='cascade')
+    field_in_box = fields.Char('Field1')
+
+
+# We add a third level of _inherits
+class Pallet(models.Model):
+    _name = 'test.pallet'
+    _inherits = {'test.box': 'box_id'}
+
+    box_id = fields.Many2one('test.box', 'Box', required=True,
+                             ondelete='cascade')
+    field_in_pallet = fields.Char('Field2')

openerp/addons/test_inherits/tests/__init__.py

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+# -*- coding: utf-8 -*-
+
+from . import test_inherits

openerp/addons/test_inherits/tests/test_inherits.py

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+# -*- coding: utf-8 -*-
+from openerp.tests import common
+
+
+class test_inherits(common.TransactionCase):
+
+    def test_create_3_levels_inherits(self):
+        """ Check that we can create an inherits on 3 levels """
+        pallet = self.env['test.pallet'].create({
+            'name': 'B',
+            'field_in_box': 'box',
+            'field_in_pallet': 'pallet',
+        })
+        self.assertTrue(pallet)
+        self.assertEqual(pallet.name, 'B')
+        self.assertEqual(pallet.field_in_box, 'box')
+        self.assertEqual(pallet.field_in_pallet, 'pallet')