feat: ADRF async views (phase1) + native async serializers (phase2) + async cache infra

user/serializers/region_serializers.py

@@ -1,22 +1,23 @@
-from rest_framework import serializers
+from adrf.serializers import ModelSerializer, SerializerMethodField
 from ..models import Region
 
 
-class RegionSerializer(serializers.ModelSerializer):
-    children = serializers.SerializerMethodField()
+class RegionSerializer(ModelSerializer):
+    children = SerializerMethodField()
 
     class Meta:
         model = Region
         fields = ['id', 'name', 'code', 'level', 'parent_id', 'pinyin', 'children']
 
-    def get_children(self, obj):
-        children = obj.children.all()
-        if children.exists():
-            return RegionSerializer(children, many=True).data
+    async def get_children(self, obj):
+        children_qs = obj.children.all()
+        if await children_qs.aexists():
+            # 递归异步序列化
+            return [await RegionSerializer(c, context=self.context).adata async for c in children_qs]
         return None
 
 
-class RegionSimpleSerializer(serializers.ModelSerializer):
+class RegionSimpleSerializer(ModelSerializer):
     class Meta:
         model = Region
         fields = ['id', 'name', 'code', 'level', 'parent_id', 'pinyin']