ComplexObject no longer inherits MutableMapping as it clearly is not a dictionary-like class, it only features some dictionary-like access for custom fragments.

Author: chsou

CHANGELOG.md

@@ -3,6 +3,9 @@
 
 ## Work in progress
 
+* Reverted changes in ComplexObject - a ComplexObject is not a dictionary-like class, it only   
+  supports some dictionary-like access functions. But, for instance, updating a ComplexObject
+  is very different from updating a dictionary. Hence, it no longer inherits MutableMapping.
 
 ## Version 1.3.2
 

c8y_api/model/_base.py

@@ -297,7 +297,7 @@ def _delete(self):
         self.c8y.delete(self._build_object_path())
 
 
-class ComplexObject(SimpleObject, MutableMapping):
+class ComplexObject(SimpleObject):
     """Abstract base class for all complex cumulocity objects
     (that can have custom fragments)."""
 
@@ -432,15 +432,6 @@ def _apply_to(self, other_id: str) -> Any[ComplexObject]:
         result.c8y = self.c8y
         return result
 
-    def __delitem__(self, _):
-        raise NotImplementedError
-
-    def __iter__(self):
-        return iter(self.fragments)
-
-    def __len__(self):
-        return len(self.fragments)
-
 
 class CumulocityResource:
     """Abstract base class for all Cumulocity API resources."""