[FIX] IntegrityError: column "lastname" contains null values

partner_firstname/partner.py

@@ -29,19 +29,23 @@ class ResPartner(orm.Model):
 
     _inherit = 'res.partner'
 
-    def init(self, cursor):
-        cursor.execute('SELECT id FROM res_partner WHERE lastname IS NOT NULL '
+    def _set_default_value_on_column(self, cr, column_name, context=None):
+        res = super(ResPartner, self)._set_default_value_on_column(
+            cr, column_name, context=context)
+        if column_name == 'lastname':
+            cr.execute('SELECT id FROM res_partner WHERE lastname IS NOT NULL '
                        'Limit 1')
-        if not cursor.fetchone():
-            cursor.execute('UPDATE res_partner set lastname = name WHERE name '
+            if not cr.fetchone():
+                cr.execute('UPDATE res_partner set lastname = name WHERE name '
                            'IS NOT NULL')
                 # Create Sql constraint if table is not empty
-            cursor.execute('SELECT id FROM res_partner Limit 1')
-            if cursor.fetchone():
-                cursor.execute('ALTER TABLE res_partner ALTER COLUMN lastname '
+                cr.execute('SELECT id FROM res_partner Limit 1')
+                if cr.fetchone():
+                    cr.execute('ALTER TABLE res_partner ALTER COLUMN lastname '
                                'SET NOT NULL')
-                _logger.info("NOT NULL constraint for res_partner.lastname "
-                             "correctly set")
+                    _logger.info("NOT NULL constraint for "
+                                 "res_partner.lastname correctly set")
+        return res
 
     def _prepare_name_custom(self, cursor, uid, partner, context=None):
         """