init additionalProperties in schema for defaults

Author: cognifloyd

st2common/st2common/util/config_loader.py

@@ -101,12 +101,16 @@ def _get_values_for_config(self, config_schema_db, config_db):
         return config
 
     @staticmethod
-    def _get_object_property_schema(object_schema):
+    def _get_object_property_schema(object_schema, init_additional_properties=None):
         additional_properties = object_schema.get("additionalProperties", {})
-        if isinstance(additional_properties, dict):
+        if additional_properties and isinstance(additional_properties, dict):
             property_schema = defaultdict(lambda: additional_properties)
         else:
             property_schema = {}
+        if init_additional_properties:
+            # ensure that these keys are present in the object (vs just defaultdict)
+            for key in init_additional_properties:
+                property_schema.__missing__(key)
         property_schema.update(object_schema.get("properties", {}))
         return property_schema
 
@@ -206,7 +210,14 @@ def _assign_default_values(self, schema, config):
                 if not config.get(schema_item_key, None):
                     config[schema_item_key] = {}
 
-                property_schema = self._get_object_property_schema(schema_item)
+                property_schema = self._get_object_property_schema(
+                    schema_item,
+                    init_additional_properties=(
+                        config[schema_item_key].keys()
+                        if has_additional_properties
+                        else None
+                    ),
+                )
 
                 self._assign_default_values(
                     schema=property_schema, config=config[schema_item_key]

st2common/tests/unit/test_config_loader.py

@@ -557,7 +557,7 @@ def test_get_config_dynamic_config_item_under_additional_properties(self):
         self.assertEqual(
             config_rendered,
             {
-                "regions": ["us-east-1"],
+                "regions": "us-east-1",
                 "profiles": {
                     "dev": {
                         "host": "127.0.0.3",