Queryset mixins (#629)

* add enum field

* add decorator for asyncio

* fix enum typing, additional tests, add docs

* add more tests

* query-mixin

* use dict to replace ordereddict

Co-authored-by: collerek <collerek@gmail.com>

ormar/models/helpers/models.py

@@ -1,4 +1,3 @@
-import collections
 import itertools
 import sqlite3
 from typing import Any, Dict, List, TYPE_CHECKING, Tuple, Type
@@ -145,7 +144,7 @@ def extract_annotations_and_default_vals(attrs: Dict) -> Tuple[Dict, Dict]:
     return attrs, model_fields
 
 
-def group_related_list(list_: List) -> collections.OrderedDict:
+def group_related_list(list_: List) -> Dict:
     """
     Translates the list of related strings into a dictionary.
     That way nested models are grouped to traverse them in a right order
@@ -174,9 +173,7 @@ def group_related_list(list_: List) -> collections.OrderedDict:
             result_dict[key] = group_related_list(new)
         else:
             result_dict.setdefault(key, []).extend(new)
-    return collections.OrderedDict(
-        sorted(result_dict.items(), key=lambda item: len(item[1]))
-    )
+    return dict(sorted(result_dict.items(), key=lambda item: len(item[1])))
 
 
 def meta_field_not_set(model: Type["Model"], field_name: str) -> bool: