Let default value of copy converted for the type of field

The default value of copy is expected to be the same format as for the default
methods. So the value for xxx2Many fields must be converted.

issue6818
review37751002

trytond/model/modelstorage.py

@@ -285,7 +285,7 @@ class ModelStorage(Model):
 
                 if field_name in default:
                     data[field_name] = default[field_name]
-                elif (isinstance(cls._fields[field_name], fields.Function)
+                if (isinstance(cls._fields[field_name], fields.Function)
                         and not isinstance(
                             cls._fields[field_name], fields.MultiValue)):
                     del data[field_name]

trytond/tests/test_copy.py

@@ -44,6 +44,24 @@ class CopyTestCase(unittest.TestCase):
             self.assertEqual([x.name for x in one2many.one2many],
                 [x.name for x in one2many_copy.one2many])
 
+    @with_transaction()
+    def test_one2many_default(self):
+        "Test copy one2many with default"
+        pool = Pool()
+        One2many = pool.get('test.copy.one2many')
+        Target = pool.get('test.copy.one2many.target')
+
+        record = One2many(name="Test")
+        record.save()
+        target = Target(name="Target")
+        target.save()
+
+        record_copy, = One2many.copy(
+            [record], default={'one2many': [target.id]})
+
+        self.assertListEqual(
+            [x.name for x in record_copy.one2many], [target.name])
+
     @with_transaction()
     def test_many2many(self):
         'Test copy many2many'
@@ -74,6 +92,23 @@ class CopyTestCase(unittest.TestCase):
             self.assertEqual([x.name for x in many2many.many2many],
                 [x.name for x in many2many_copy.many2many])
 
+    @with_transaction()
+    def test_many2many_default(self):
+        "Test copy many2many with default"
+        pool = Pool()
+        Many2many = pool.get('test.copy.many2many')
+        Target = pool.get('test.copy.many2many.target')
+
+        record = Many2many(name="Test")
+        record.save()
+        target = Target(name="Target")
+        target.save()
+
+        record_copy, = Many2many.copy(
+            [record], default={'many2many': [target.id]})
+
+        self.assertSequenceEqual(record_copy.many2many, [target])
+
 
 def suite():
     return unittest.TestLoader().loadTestsFromTestCase(CopyTestCase)