added basic save, update, load and delate methods

orm/helpers.py

@@ -0,0 +1,27 @@
+from typing import Union, Set, Dict  # pragma no cover
+
+
+class Excludable:  # pragma no cover
+
+    @staticmethod
+    def get_excluded(exclude: Union[Set, Dict, None], key: str = None):
+        # print(f'checking excluded for {key}', exclude)
+        if isinstance(exclude, dict):
+            if isinstance(exclude.get(key, {}), dict) and '__all__' in exclude.get(key, {}).keys():
+                return exclude.get(key).get('__all__')
+            return exclude.get(key, {})
+        return exclude
+
+    @staticmethod
+    def is_excluded(exclude: Union[Set, Dict, None], key: str = None):
+        if exclude is None:
+            return False
+        to_exclude = Excludable.get_excluded(exclude, key)
+        # print(f'to exclude for current key = {key}', to_exclude)
+
+        if isinstance(to_exclude, Set):
+            return key in to_exclude
+        elif to_exclude is ...:
+            return True
+        else:
+            return False