Fix inspection of classes with inheritance

wsme/tests/test_types.py

@@ -103,3 +103,13 @@ class TestTypes(unittest.TestCase):
 
         assert hasattr(Inner, '_wsme_attributes')
         assert len(Inner._wsme_attributes) == 1
+
+    def test_inspect_with_inheritance(self):
+        class Parent(object):
+            parent_attribute = int
+
+        class Child(Parent):
+            child_attribute = int
+
+        types.register_type(Child)
+

wsme/types.py

@@ -93,7 +93,11 @@ def sort_attributes(class_, attributes):
         names_order = []
         try:
             lines = []
-            for line in inspect.getsourcelines(class_)[0]:
+            for cls in inspect.getmro(class_):
+                if cls is object:
+                    continue
+                lines[len(lines):] = inspect.getsourcelines(cls)[0]
+            for line in lines:
                 line = line.strip().replace(" ", "")
                 if '=' in line:
                     aname = line[:line.index('=')]