# I would like to know how to control the information that is added to a list, not to be duplicated **URL:** \ **Category:** Ask for Help\ **Created:** [November 17, 2021, 5:13pm UTC](https://community.glideapps.com/t/i-would-like-to-know-how-to-control-the-information-that-is-added-to-a-list-not-to-be-duplicated/34664 "2021-11-17T17:13:44Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Juan\_Perez](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/juan_perez/32/26552_2.png) [@Juan\_Perez](https://community.glideapps.com/u/Juan_Perez)\ **Post date:** [November 17, 2021, 5:13pm UTC](https://community.glideapps.com/t/i-would-like-to-know-how-to-control-the-information-that-is-added-to-a-list-not-to-be-duplicated/34664/1 "2021-11-17T17:13:45Z")
Hello, I would like to know how to control the information that is added to a list, not to be duplicated. Ex: if I have the items “White”, “blue”, “green”, “yellow”. and I want to add another color let’s say “Green”, which does not accept it and shows a message that is already in the list. Thank you very much for the help you can give me, since I am beginning to know the glide tool. ---
**Author:** ![ThinhDinh](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/thinhdinh/32/49_2.png) [@ThinhDinh](https://community.glideapps.com/u/ThinhDinh)\ **Post date:** [November 18, 2021, 12:22am UTC](https://community.glideapps.com/t/i-would-like-to-know-how-to-control-the-information-that-is-added-to-a-list-not-to-be-duplicated/34664/2 "2021-11-18T00:22:59Z")
> [@How do I create a custom form?](https://community.glideapps.com/t/how-do-i-create-a-custom-form/25014/): > > I’m just dropping this here so I have something to refer people to when they ask. This is a simple concept app (copyable), that demonstrates the following techniques: Building custom forms for adding and editing list items (as an alternative to the native forms provided by Glide) Preventing duplicate new entries using [User Specific Columns](https://docs.glideapps.com/all/reference/data-editor/user-specific-columns) and [Relations](https://docs.glideapps.com/all/reference/data-editor/computed-columns/relation-column) Enforcing mandatory input items The use of visibility conditions and user specific booleans to control user flow There is nothing particula… You should be able to achieve that with a custom form. Add a relation from your color entry to the existing list of colors. If the relation is not empty then show the error message and hide the submit button. ---
**Author:** ![Juan\_Perez](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/juan_perez/32/26552_2.png) [@Juan\_Perez](https://community.glideapps.com/u/Juan_Perez)\ **Post date:** [November 18, 2021, 3:35pm UTC](https://community.glideapps.com/t/i-would-like-to-know-how-to-control-the-information-that-is-added-to-a-list-not-to-be-duplicated/34664/3 "2021-11-18T15:35:39Z")
Hello, according to your suggestion, I decided to see the app that offers a solution to my question above, and when I copy it, it asks me to enter my Glide account, and I continue, but I see that my apps that I have made so far do not appear, what happened ?, I strongly ask you to help me with this problem, because I ran out of my applications. Thank you ---
**Author:** ![Juan\_Perez](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/juan_perez/32/26552_2.png) [@Juan\_Perez](https://community.glideapps.com/u/Juan_Perez)\ **Post date:** [November 18, 2021, 4:42pm UTC](https://community.glideapps.com/t/i-would-like-to-know-how-to-control-the-information-that-is-added-to-a-list-not-to-be-duplicated/34664/4 "2021-11-18T16:42:52Z")
It seems that glide creates another section with the same name where I have my applications, and another one for the application that I copied ---
**Author:** ![Juan\_Perez](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/juan_perez/32/26552_2.png) [@Juan\_Perez](https://community.glideapps.com/u/Juan_Perez)\ **Post date:** [November 18, 2021, 4:46pm UTC](https://community.glideapps.com/t/i-would-like-to-know-how-to-control-the-information-that-is-added-to-a-list-not-to-be-duplicated/34664/5 "2021-11-18T16:46:32Z")
The example that you indicate seems to be not case-sensitive when entering the name of a new animal, and neither in editing. ---
**Author:** ![ThinhDinh](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/thinhdinh/32/49_2.png) [@ThinhDinh](https://community.glideapps.com/u/ThinhDinh)\ **Post date:** [November 18, 2021, 11:35pm UTC](https://community.glideapps.com/t/i-would-like-to-know-how-to-control-the-information-that-is-added-to-a-list-not-to-be-duplicated/34664/6 "2021-11-18T23:35:20Z")
Firstly have you got your dashboard back to “normal” yet? > [@Juan\_Perez](#): > > The example that you indicate seems to be not case-sensitive It should be case-sensitive, can you include some screenshots or a video of what’s happening? > [@Juan\_Perez](#): > > neither in editing. The example there was just for adding. For editing you would need to have basically the same setup, creating multiple user-specific columns to house the “edited” values, then when users want to commit the edit, set them to the real columns.