Fix tupos in var names

api/v1/serializers/course.py

@@ -121,7 +121,7 @@ class CourseCreateSerializer(serializers.ModelSerializer):
                     t.title = c['data']['title']
                     t.course = course
                     t.txt = c['data']['txt']
-                    i.save()
+                    t.save()
                 else:
                     t = Text.objects.create(
                         position=c['data']['position'],
@@ -154,7 +154,7 @@ class CourseCreateSerializer(serializers.ModelSerializer):
                     it.txt = c['data']['txt']
                     it.save()
                 else:
-                    i = ImageText.objects.create(
+                    it = ImageText.objects.create(
                         position=c['data']['position'],
                         title=c['data']['title'],
                         course=course,
@@ -205,7 +205,7 @@ class CourseCreateSerializer(serializers.ModelSerializer):
                     t.title = c['data']['title']
                     t.course = course
                     t.txt = c['data']['txt']
-                    i.save()
+                    t.save()
                 else:
                     t = Text.objects.create(
                         position=c['data']['position'],
@@ -238,7 +238,7 @@ class CourseCreateSerializer(serializers.ModelSerializer):
                     it.txt = c['data']['txt']
                     it.save()
                 else:
-                    i = ImageText.objects.create(
+                    it = ImageText.objects.create(
                         position=c['data']['position'],
                         title=c['data']['title'],
                         course=course,