add feed in / out button page and also button to redirect to button page

backend/apps/farms/serializers.py

@@ -11,12 +11,56 @@ class SiteSerializer(PkAsIdMixin, serializers.ModelSerializer):
         read_only_fields = ["id", "created_at", "updated_at"]
 
 
+class FeedInButtonUrlSerializer(serializers.Serializer):
+    label = serializers.CharField(max_length=50, required=False, allow_blank=True, default="")
+    url = serializers.URLField(max_length=500)
+
+
 class KandangSerializer(PkAsIdMixin, serializers.ModelSerializer):
+    feed_in_button_urls = FeedInButtonUrlSerializer(many=True, required=False)
+
     class Meta:
         model = Kandang
-        fields = ["id", "kandang_name", "site", "created_at", "updated_at"]
+        fields = [
+            "id",
+            "kandang_name",
+            "feed_in_button_urls",
+            "site",
+            "created_at",
+            "updated_at",
+        ]
         read_only_fields = ["id", "created_at", "updated_at"]
 
+    def validate_feed_in_button_urls(self, value):
+        cleaned = []
+        for item in value or []:
+            url = str(item.get("url", "")).strip()
+            if not url:
+                continue
+            label = str(item.get("label", "") or "").strip()[:50]
+            cleaned.append({"label": label, "url": url})
+        return cleaned
+
+    def update(self, instance, validated_data):
+        urls = validated_data.pop("feed_in_button_urls", None)
+        instance = super().update(instance, validated_data)
+        if urls is not None:
+            instance.feed_in_button_urls = urls
+            instance.save(update_fields=["feed_in_button_urls", "updated_at"])
+        return instance
+
+    def to_representation(self, instance):
+        data = super().to_representation(instance)
+        urls = data.get("feed_in_button_urls") or []
+        if not isinstance(urls, list):
+            urls = []
+        data["feed_in_button_urls"] = [
+            {"label": str(item.get("label", "") or ""), "url": str(item.get("url", "") or "")}
+            for item in urls
+            if isinstance(item, dict) and str(item.get("url", "") or "").strip()
+        ]
+        return data
+
 
 class FlockSerializer(PkAsIdMixin, serializers.ModelSerializer):
     class Meta: