[FIX] expression: fix search on one2many field with inherited inverse field

Consider the following setting:
 - on model A, field F is computed, stored, and depends on field G
 - on model A, field one2many G to model B, with inverse field H
 - on model B, field many2one H is inherited (_inherits) from model C
 - on model C, field many2one H is stored

When adding records of model B, the field F must be recomputed.  In order to
determine which records to recompute, one searches model A with a domain like
[(G, 'in', ids)].  In expression.py, this is resolved with an SQL query like

    select H from B where id in {ids}

This query fails, since the field H is not stored in model B.  This happens in
general if H is not stored (it may be any computed field).  In that case, one
should instead browse records from B, and read field H through the ORM.

A test case has been added: it introduces a many2one field in a parent model,
and a one2many field using the inherited many2one on a child model.  The test
checks whether one can search on the one2many field.

1 files changed, 9 insertions, 3 deletions

diff --git a/openerp/osv/expression.py b/openerp/osv/expression.py
index 7f962c260fa..dedd043ca90 100644
--- a/openerp/osv/expression.py
+++ b/openerp/osv/expression.py
@@ -138,6 +138,7 @@ import traceback
 
 import openerp.modules
 from . import fields
+from .. import SUPERUSER_ID
 from ..models import MAGIC_COLUMNS, BaseModel
 import openerp.tools as tools
 
@@ -941,11 +942,16 @@ class expression(object):
                             call_null = False
                             push(create_substitution_leaf(leaf, FALSE_LEAF, model))
                     else:
-                        ids2 = select_from_where(cr, column._fields_id, comodel._table, 'id', ids2, operator)
-                        if ids2:
+                        # determine ids1 <-- column._fields_id --- ids2
+                        if comodel._fields[column._fields_id].store:
+                            ids1 = select_from_where(cr, column._fields_id, comodel._table, 'id', ids2, operator)
+                        else:
+                            recs = comodel.browse(cr, SUPERUSER_ID, ids2, {'prefetch_fields': False})
+                            ids1 = recs.mapped(column._fields_id).ids
+                        if ids1:
                             call_null = False
                             o2m_op = 'not in' if operator in NEGATIVE_TERM_OPERATORS else 'in'
-                            push(create_substitution_leaf(leaf, ('id', o2m_op, ids2), model))
+                            push(create_substitution_leaf(leaf, ('id', o2m_op, ids1), model))
 
                 if call_null:
                     o2m_op = 'in' if operator in NEGATIVE_TERM_OPERATORS else 'not in'