- Removed error throw for uniting parts with missing masters

- Added test case for #927

Author: A-Baji

datajoint/dependencies.py

@@ -26,8 +26,6 @@ def unite_master_parts(lst):
                     # move from the ith position to the (j+1)th position
                     lst[j+1:i+1] = [name] + lst[j+1:i]
                     break
-            else:
-                raise DataJointError("Found a part table {name} without its master table.".format(name=name))
     return lst
 
 

tests/test_declare.py

@@ -160,6 +160,37 @@ def test_dependencies():
         assert_set_equal(set(s.full_table_name for s in channel.parents(primary=True, as_objects=True)),
                          {ephys.full_table_name})
 
+    @staticmethod
+    def test_descendants_only_contain_part_table():
+        """issue #927"""
+
+        @schema
+        class A(dj.Manual):
+            definition = """
+            a: int
+            """
+
+        @schema
+        class B(dj.Manual):
+            definition = """
+            -> A
+            b: int
+            """
+
+        @schema
+        class Master(dj.Manual):
+            definition = """
+            table_master: int
+            """
+
+            class Part(dj.Part):
+                definition = """
+                -> master
+                -> B
+                """
+
+        assert A.descendants() == ['`djtest_test1`.`a`', '`djtest_test1`.`b`', '`djtest_test1`.`master__part`']
+
     @staticmethod
     @raises(dj.DataJointError)
     def test_bad_attribute_name():