feat: Introduce lists and reviews apps, refactor user list functionality from accounts, and add user profile fields.

backend/apps/lists/serializers.py

@@ -0,0 +1,57 @@
+from rest_framework import serializers
+from .models import UserList, ListItem
+from apps.accounts.serializers import UserSerializer
+
+class ListItemSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = ListItem
+        fields = [
+            "id",
+            "user_list",
+            "content_type",
+            "object_id",
+            "rank",
+            "notes",
+            "created_at",
+            "updated_at",
+            "content_object_data",
+        ]
+        read_only_fields = ["id", "created_at", "updated_at"]
+
+    content_object_data = serializers.SerializerMethodField()
+
+    def get_content_object_data(self, obj):
+        """
+        Return serialized data for the content object (Park or Ride).
+        """
+        # Avoid circular imports
+        from apps.api.v1.parks.serializers import ParkListSerializer
+        from apps.api.v1.rides.serializers import RideListSerializer
+        from apps.parks.models import Park
+        from apps.rides.models import Ride
+
+        if isinstance(obj.content_object, Park):
+            return ParkListSerializer(obj.content_object, context=self.context).data
+        elif isinstance(obj.content_object, Ride):
+            return RideListSerializer(obj.content_object, context=self.context).data
+        return None
+
+
+class UserListSerializer(serializers.ModelSerializer):
+    user = UserSerializer(read_only=True)
+    items = ListItemSerializer(many=True, read_only=True)
+
+    class Meta:
+        model = UserList
+        fields = [
+            "id",
+            "user",
+            "title",
+            "category",
+            "description",
+            "is_public",
+            "items",
+            "created_at",
+            "updated_at",
+        ]
+        read_only_fields = ["id", "user", "created_at", "updated_at"]