Fix dublication

api/v1/serializers/mixins.py

@@ -85,10 +85,15 @@ class DispatchContentMixin(object):
                     g.save()
                     if 'images' in cdata:
                         for image in cdata['images']:
-                            gi = GalleryImage.objects.create(
-                                gallery=g,
-                                img=ImageObject.objects.get(id=image['img'])
-                            )
+                            if 'id' in image and image['id']:
+                                gi = GalleryImage.objects.get(id=image['id'])
+                                gi.img = ImageObject.objects.get(id=image['img'])
+                                gi.save()
+                            else:
+                                gi = GalleryImage.objects.create(
+                                    gallery=g,
+                                    img=ImageObject.objects.get(id=image['img'])
+                                )
                 else:
                     g = Gallery.objects.create(
                         course=course,
@@ -97,10 +102,15 @@ class DispatchContentMixin(object):
                     )
                     if 'images' in cdata:
                         for image in cdata['images']:
-                            gi = GalleryImage.objects.create(
-                                gallery=g,
-                                img=ImageObject.objects.get(id=image['img']),
-                            )
+                            if 'id' in image and image['id']:
+                                gi = GalleryImage.objects.get(id=image['id'])
+                                gi.img = ImageObject.objects.get(id=image['img'])
+                                gi.save()
+                            else:
+                                gi = GalleryImage.objects.create(
+                                    gallery=g,
+                                    img=ImageObject.objects.get(id=image['img'])
+                                )
 
 
 class DispatchMaterialMixin(object):