音楽で楽しみましょう！-Let's have fun with music!-

Signed-off-by: Shin'ya Minazuki <shinyoukai@laidback.moe>

api/funquail_api/common/mixins.py

@@ -0,0 +1,33 @@
+from django.db.models import Q
+from django.shortcuts import get_object_or_404
+from rest_framework import serializers
+
+
+class MultipleLookupDetailMixin:
+    lookup_value_regex = "[^/]+"
+    lookup_field = "composite"
+
+    def get_object(self):
+        queryset = self.filter_queryset(self.get_queryset())
+
+        relevant_lookup = None
+        value = None
+        for lookup in self.url_lookups:
+            field_validator = lookup["validator"]
+            try:
+                value = field_validator(self.kwargs["composite"])
+            except serializers.ValidationError:
+                continue
+            else:
+                relevant_lookup = lookup
+                break
+        get_query = relevant_lookup.get(
+            "get_query", lambda value: Q(**{relevant_lookup["lookup_field"]: value})
+        )
+        query = get_query(value)
+        obj = get_object_or_404(queryset, query)
+
+        # May raise a permission denied
+        self.check_object_permissions(self.request, obj)
+
+        return obj