[FIX] models: ormcache invalidation on import

Do not propagate cache invalidations to other workers when changes must be
discarded, because of an import error or a dry run, which are both handled as
successful transactions.

addons/base_import/models/base_import.py

@@ -885,6 +885,8 @@ class Import(models.TransientModel):
         try:
             if dryrun:
                 self._cr.execute('ROLLBACK TO SAVEPOINT import')
+                # cancel all changes done to the registry/ormcache
+                self.pool.reset_changes()
             else:
                 self._cr.execute('RELEASE SAVEPOINT import')
         except psycopg2.InternalError:

odoo/models.py

@@ -846,7 +846,6 @@ class BaseModel(MetaModel('DummyModel', (object,), {'_register': False})):
         ids = []
         messages = []
         ModelData = self.env['ir.model.data']
-        ModelData.clear_caches()
 
         # list of (xid, vals, info) for records to be created in batch
         batch = []
@@ -928,6 +927,8 @@ class BaseModel(MetaModel('DummyModel', (object,), {'_register': False})):
         if any(message['type'] == 'error' for message in messages):
             cr.execute('ROLLBACK TO SAVEPOINT model_load')
             ids = False
+            # cancel all changes done to the registry/ormcache
+            self.pool.reset_changes()
 
         return {'ids': ids, 'messages': messages}