UPDATE

dashboard/serializers.py

@@ -0,0 +1,59 @@
+from rest_framework import serializers
+
+from .mock_data import VALID_CARD_IDS, VALID_ROW_IDS
+
+
+class FarmDashboardConfigSerializer(serializers.Serializer):
+    disabled_card_ids = serializers.ListField(
+        child=serializers.CharField(),
+        allow_empty=True,
+    )
+    row_order = serializers.ListField(
+        child=serializers.CharField(),
+        allow_empty=False,
+    )
+    enable_drag_reorder = serializers.BooleanField()
+
+    def validate_disabled_card_ids(self, value):
+        invalid_ids = [card_id for card_id in value if card_id not in VALID_CARD_IDS]
+        if invalid_ids:
+            raise serializers.ValidationError(
+                f"Invalid card IDs: {', '.join(invalid_ids)}."
+            )
+        if len(set(value)) != len(value):
+            raise serializers.ValidationError("disabled_card_ids must not contain duplicates.")
+        return value
+
+    def validate_row_order(self, value):
+        invalid_ids = [row_id for row_id in value if row_id not in VALID_ROW_IDS]
+        if invalid_ids:
+            raise serializers.ValidationError(
+                f"Invalid row IDs: {', '.join(invalid_ids)}."
+            )
+        if len(set(value)) != len(value):
+            raise serializers.ValidationError("row_order must not contain duplicates.")
+        if set(value) != set(VALID_ROW_IDS):
+            raise serializers.ValidationError(
+                "row_order must contain each valid row ID exactly once."
+            )
+        return value
+
+
+class FarmDashboardConfigPatchSerializer(FarmDashboardConfigSerializer):
+    disabled_card_ids = serializers.ListField(
+        child=serializers.CharField(),
+        allow_empty=True,
+        required=False,
+    )
+    row_order = serializers.ListField(
+        child=serializers.CharField(),
+        allow_empty=False,
+        required=False,
+    )
+    enable_drag_reorder = serializers.BooleanField(required=False)
+
+    def validate(self, attrs):
+        attrs = super().validate(attrs)
+        if not attrs:
+            raise serializers.ValidationError("At least one config field must be provided.")
+        return attrs