Make multilink expressions work with mysql

Author: schlatterbeck

roundup/backends/rdbms_common.py

@@ -2433,7 +2433,7 @@ def _filter_multilink_expression_fallback(
                     if is_valid(kws): append(last_id)
                     last_id, kws = nid, []
             if kw is not None:
-                kws.append(kw)
+                kws.append(int(kw))
 
         if last_id is not None and is_valid(kws): 
             append(last_id)

test/db_test_base.py

@@ -1929,8 +1929,6 @@ def testFilteringMultilink(self):
             ae(filt(None, {'nosy': ['1','2']}, ('+', 'status'),
                 ('-', 'deadline')), ['4', '3'])
 
-    # Currently fails on the very first test for mysql
-    @pytest.mark.xfail
     def testFilteringMultilinkExpression(self):
         ae, iiter = self.filteringSetup()
         kw1 = self.db.keyword.create(name='Key1')