[DIN-749] Add feature to delete nulls in overrides

hierarchical_conf/hierarchical_conf.py

@@ -117,6 +117,8 @@ def _deep_update(
             if isinstance(value, Mapping) and value:
                 returned = self._deep_update(source.get(key, {}), value)
                 source[key] = returned
+            elif value is None:
+                source.pop(key, None)
             else:
                 source[key] = overrides[key]
         return source

setup.py

@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 
 __package_name__ = "hierarchical_conf"
-__version__ = "1.0.3"
+__version__ = "1.0.4"
 __repository_url__ = "https://github.com/quintoandar/hierarchical-conf"
 
 

tests/unit/test_hierarchical_conf.py

@@ -174,3 +174,18 @@ def test_deep_update(self, hierarchical_conf):
 
         # assert
         assert returned_value == expected_value
+
+    def test_deep_update_deleting_nulls(self, hierarchical_conf):
+        # arrange
+        expected_value = {"key2": "new value", "key3": {"a": 1}}
+        source = {
+            "key1": "val1",
+            "key2": "val2",
+        }
+        overrides = {"key1": None, "key2": "new value", "key3": {"a": 1}}
+
+        # act
+        returned_value = hierarchical_conf._deep_update(source, overrides)
+
+        # assert
+        assert returned_value == expected_value