Update course app serializers

api/v1/serializers.py

@@ -87,6 +87,7 @@ class CategorySerializer(serializers.ModelSerializer):
 
 
 class CourseSerializer(serializers.ModelSerializer):
+    cover = ImageObjectSerializer()
 
     class Meta:
         model = Course
@@ -114,7 +115,6 @@ class CourseSerializer(serializers.ModelSerializer):
 
         read_only_fields = (
             'id',
-            'cover',
             'content',
             'created_at',
             'update_at',
@@ -124,9 +124,11 @@ class CourseSerializer(serializers.ModelSerializer):
 class CourseRetrieveSerializer(CourseSerializer):
     category = CategorySerializer()
     materials = MaterialSerializer(many=True)
+    cover = ImageObjectSerializer()
 
 
 class LessonSerializer(serializers.ModelSerializer):
+    cover = ImageObjectSerializer()
 
     class Meta:
         model = Lesson
@@ -136,6 +138,7 @@ class LessonSerializer(serializers.ModelSerializer):
             'short_description',
             'course',
             'cover',
+            'content',
             'created_at',
             'update_at',
         )
@@ -143,6 +146,7 @@ class LessonSerializer(serializers.ModelSerializer):
         read_only_fields = (
             'id',
             'cover',
+            'content',
             'created_at',
             'update_at',
         )