Fixed #63 : bug is smart_get_attr

src/core/sheerka/services/SheerkaConceptManager.py

@@ -441,7 +441,7 @@ class SheerkaConceptManager(BaseService):
             :param concept_to_look_for:
             :return:
             """
-            while c.body is not NotInit:
+            while isinstance(c, Concept) and c.body is not NotInit:
                 if self.sheerka.isinstance(c.body, concept_to_look_for):
                     return c.body
                 c = c.body

tests/core/test_SheerkaConceptManager.py

@@ -1403,6 +1403,25 @@ class TestSheerkaConceptManager(TestUsingMemoryBasedSheerka):
         res = sheerka.smart_get_attr(table_instance, color)
         assert sheerka.isinstance(res, BuiltinConcepts.NOT_FOUND)
 
+    def test_i_cannot_smart_get_attr_when_attribute_does_not_exist(self):
+        sheerka, context, adjective, color, red, size, table = self.init_concepts("adjective",
+                                                                                  "color",
+                                                                                  Concept("red", body="red").auto_init(),
+                                                                                  "size",
+                                                                                  "table",
+                                                                                  create_new=True)
+        sheerka.set_isa(context, color, adjective)
+        sheerka.set_isa(context, red, color)
+        sheerka.set_isa(context, size, adjective)
+
+        table_instance = sheerka.new(table)
+        color_instance = sheerka.new(color, body=red)
+        adjective_instance = sheerka.new(adjective, body=color_instance)
+        sheerka.set_attr(table_instance, adjective, adjective_instance)
+
+        res = sheerka.smart_get_attr(table_instance, size)
+        assert sheerka.isinstance(res, BuiltinConcepts.NOT_FOUND)
+
 
 class TestSheerkaConceptManagerUsingFileBasedSheerka(TestUsingFileBasedSheerka):
     def test_i_can_add_several_concepts(self):