add test for #876

Author: dimitri-yatsenko

datajoint/schemas.py

@@ -298,12 +298,10 @@ def exists(self):
         """
         if self.database is None:
             raise DataJointError("Schema must be activated first.")
-        return self.database is not None and (
-            self.connection.query(
-                "SELECT schema_name "
-                "FROM information_schema.schemata "
-                "WHERE schema_name = '{database}'".format(
-                    database=self.database)).rowcount > 0)
+        return bool(self.connection.query(
+            "SELECT schema_name "
+            "FROM information_schema.schemata "
+            "WHERE schema_name = '{database}'".format(database=self.database)).rowcount)
 
     @property
     def jobs(self):

tests/test_fetch.py

@@ -241,5 +241,9 @@ def test_fetch_format(self):
         list1 = sorted(key, key=itemgetter('subject_id'))
         for l1, l2 in zip(list1, list2):
             assert_dict_equal(l1, l2, 'Primary key is not returned correctly')
+
+        # test pandas with fetch1
+        k = (self.subject & 'subject_id=10').fetch1('KEY')
+
         # revert configuration of fetch format
         dj.config['fetch_format'] = 'array'