Fix course serializer

api/v1/serializers/course.py

@@ -150,8 +150,8 @@ class CourseCreateSerializer(DispatchContentMixin,
         self.dispatch_gallery(course, gallery)
         return course
 
-        def to_representation(self, instance):
-            return CourseSerializer(instance, context=self.context).to_representation(instance)
+    def to_representation(self, instance):
+        return CourseSerializer(instance=instance, context=self.context).to_representation(instance)
 
 
 class LessonCreateSerializer(serializers.ModelSerializer):
@@ -318,7 +318,7 @@ class LessonSerializer(serializers.ModelSerializer):
         )
 
 
-class CourseSerializer(CourseCreateSerializer):
+class CourseSerializer(serializers.ModelSerializer):
     author = UserSerializer()
     category = CategorySerializer()
     materials = MaterialSerializer(many=True)
@@ -326,3 +326,40 @@ class CourseSerializer(CourseCreateSerializer):
     gallery = GallerySerializer()
     content = ContentSerializer(many=True)
     lessons = LessonSerializer(many=True)
+
+    class Meta:
+        model = Course
+        fields = (
+            'id',
+            'slug',
+            'author',
+            'title',
+            'short_description',
+            'from_author',
+            'cover',
+            'price',
+            'is_infinite',
+            'deferred_start_at',
+            'category',
+            'duration',
+            'is_featured',
+            'url',
+            'status',
+            'likes',
+            'materials',
+            'created_at',
+            'update_at',
+            'deactivated_at',
+            'content',
+            'gallery',
+            'lessons',
+        )
+
+        read_only_fields = (
+            'id',
+            'url',
+            'lessons',
+            'created_at',
+            'update_at',
+            'deactivated_at',
+        )