refactor: check for keys and values simple types while de-serializing

openedx_events/event_bus/avro/deserializer.py

@@ -60,7 +60,7 @@ def _deserialized_avro_record_dict_to_object(data: dict, data_type, deserializer
                 "Dict without annotation type is not supported. The argument should be a type, for eg., Dict[str, int]"
             )
         # Check whether dict items type is in basic types.
-        if arg_data_type[1] in SIMPLE_PYTHON_TYPE_TO_AVRO_MAPPING:
+        if all(arg in SIMPLE_PYTHON_TYPE_TO_AVRO_MAPPING for arg in arg_data_type):
             return data
     elif hasattr(data_type, "__attrs_attrs__"):
         transformed = {}

openedx_events/event_bus/avro/tests/test_deserializer.py

@@ -312,6 +312,13 @@ def test_deserialization_of_dict_with_complex_types_fails(self):
         with self.assertRaises(TypeError):
             deserializer.from_dict(initial_dict)
 
+    def test_deserialization_of_dicts_with_keys_of_complex_types_fails(self):
+        SIGNAL = create_simple_signal({"dict_input": Dict[CourseKey, int]})
+        deserializer = AvroSignalDeserializer(SIGNAL)
+        initial_dict = {"dict_input": {CourseKey.from_string("course-v1:edX+DemoX.1+2014"): 1}}
+        with self.assertRaises(TypeError):
+            deserializer.from_dict(initial_dict)
+
     def test_deserialization_of_nested_list_fails(self):
         """
         Check that deserialization raises error when nested list data is passed.