diff --git a/apps/hadis/serializers/serializers_admin.py b/apps/hadis/serializers/serializers_admin.py
index 37414d0..d72e060 100644
--- a/apps/hadis/serializers/serializers_admin.py
+++ b/apps/hadis/serializers/serializers_admin.py
@@ -10,6 +10,17 @@ from ..models import (
 from .category import LocalizedField
 
 
+class AbsoluteImageField(serializers.ImageField):
+    def to_representation(self, value):
+        if not value:
+            return None
+        request = self.context.get("request")
+        url = value.url if hasattr(value, "url") else str(value)
+        if request:
+            return request.build_absolute_uri(url)
+        return url
+
+
 class AdminHadisCategorySerializer(serializers.ModelSerializer):
     sect_type = serializers.CharField(source='sect.sect_type', read_only=True)
     title = LocalizedField()
@@ -79,10 +90,50 @@ class HadisCollectionsField(serializers.PrimaryKeyRelatedField):
 class AdminHadisCollectionSerializer(serializers.ModelSerializer):
     title = serializers.JSONField()
     summary = serializers.JSONField()
+    thumbnail = AbsoluteImageField(required=False, allow_null=True)
+    remove_thumbnail = serializers.BooleanField(write_only=True, required=False, default=False)
 
     class Meta:
         model = HadisCollection
-        fields = ["id", "title", "slug", "summary", "display_position", "status", "order", "pin_top"]
+        fields = [
+            "id",
+            "title",
+            "slug",
+            "summary",
+            "status",
+            "pin_top",
+            "order",
+            "thumbnail",
+            "remove_thumbnail",
+            "created_at",
+            "updated_at",
+        ]
+        read_only_fields = ["id", "created_at", "updated_at"]
+
+    def to_internal_value(self, data):
+        mutable_data = data.copy() if hasattr(data, "copy") else data
+        thumbnail = mutable_data.get("thumbnail") if hasattr(mutable_data, "get") else None
+        if thumbnail and hasattr(thumbnail, "read"):
+            compressed_bytes = maybe_compress_uploaded_file(thumbnail)
+            if compressed_bytes is not None:
+                mutable_data = mutable_data.copy() if hasattr(mutable_data, "copy") else mutable_data
+                mutable_data["thumbnail"] = SimpleUploadedFile(
+                    name=getattr(thumbnail, "name", "image"),
+                    content=compressed_bytes,
+                    content_type=getattr(thumbnail, "content_type", None),
+                )
+        return super().to_internal_value(mutable_data)
+
+    def create(self, validated_data):
+        validated_data.pop("remove_thumbnail", False)
+        return super().create(validated_data)
+
+    def update(self, instance, validated_data):
+        remove_thumbnail = validated_data.pop("remove_thumbnail", False)
+        if remove_thumbnail and instance.thumbnail:
+            instance.thumbnail.delete(save=False)
+            instance.thumbnail = None
+        return super().update(instance, validated_data)
 
 
 class AdminHadisDetailSerializer(serializers.ModelSerializer):
@@ -224,18 +275,6 @@ class AdminHadisInterpretationSerializer(serializers.ModelSerializer):
         ]
         read_only_fields = ["id", "created_at", "updated_at"]
 
-
-class AbsoluteImageField(serializers.ImageField):
-    def to_representation(self, value):
-        if not value:
-            return None
-        request = self.context.get("request")
-        url = value.url if hasattr(value, "url") else str(value)
-        if request:
-            return request.build_absolute_uri(url)
-        return url
-
-
 class AbsoluteFileField(serializers.FileField):
     def to_representation(self, value):
         if not value:
@@ -313,56 +352,6 @@ class AdminHadisCategoryArchiveSerializer(serializers.ModelSerializer):
             instance.xmind_file = None
         return super().update(instance, validated_data)
 
-
-class AdminHadisCollectionSerializer(serializers.ModelSerializer):
-    title = serializers.JSONField()
-    summary = serializers.JSONField()
-    thumbnail = AbsoluteImageField(required=False, allow_null=True)
-    remove_thumbnail = serializers.BooleanField(write_only=True, required=False, default=False)
-
-    class Meta:
-        model = HadisCollection
-        fields = [
-            "id",
-            "title",
-            "slug",
-            "summary",
-            "status",
-            "pin_top",
-            "order",
-            "thumbnail",
-            "remove_thumbnail",
-            "created_at",
-            "updated_at",
-        ]
-        read_only_fields = ["id", "created_at", "updated_at"]
-
-    def to_internal_value(self, data):
-        mutable_data = data.copy() if hasattr(data, "copy") else data
-        thumbnail = mutable_data.get("thumbnail") if hasattr(mutable_data, "get") else None
-        if thumbnail and hasattr(thumbnail, "read"):
-            compressed_bytes = maybe_compress_uploaded_file(thumbnail)
-            if compressed_bytes is not None:
-                mutable_data = mutable_data.copy() if hasattr(mutable_data, "copy") else mutable_data
-                mutable_data["thumbnail"] = SimpleUploadedFile(
-                    name=getattr(thumbnail, "name", "image"),
-                    content=compressed_bytes,
-                    content_type=getattr(thumbnail, "content_type", None),
-                )
-        return super().to_internal_value(mutable_data)
-
-    def create(self, validated_data):
-        validated_data.pop("remove_thumbnail", False)
-        return super().create(validated_data)
-
-    def update(self, instance, validated_data):
-        remove_thumbnail = validated_data.pop("remove_thumbnail", False)
-        if remove_thumbnail and instance.thumbnail:
-            instance.thumbnail.delete(save=False)
-            instance.thumbnail = None
-        return super().update(instance, validated_data)
-
-
 class AdminTransmitterReliabilitySerializer(serializers.ModelSerializer):
     class Meta:
         model = TransmitterReliability