feat: add option to duplicate list key (#1) (#2)

Release-As: 0.1.0

Co-authored-by: mikko.nieminen <mikko.nieminen@bihealth.de>

drf_keyed_list/serializers.py

@@ -10,6 +10,7 @@ class KeyedListSerializer(ListSerializer):
         "not_a_dict": _('Expected a dict of items but got type "{input_type}".'),
         "empty": _("This dict may not be empty."),
     }
+    _duplicate_key = False
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -18,6 +19,7 @@ def __init__(self, *args, **kwargs):
             meta, "keyed_list_serializer_field"
         ), "Must provide a field name at keyed_list_serializer_field when using KeyedListSerializer"
         self._keyed_field = meta.keyed_list_serializer_field
+        self._duplicate_key = meta.duplicate_list_key
 
     def to_internal_value(self, data):
         if not isinstance(data, dict):
@@ -34,4 +36,6 @@ def to_internal_value(self, data):
 
     def to_representation(self, data):
         response = super().to_representation(data)
+        if self._duplicate_key:
+            return {v[self._keyed_field]: v for v in response}
         return {v.pop(self._keyed_field): v for v in response}