# Help: Admin feature for adding/removing users to concerts (Trebuchet method)

**URL:** https://community.glideapps.com/t/help-admin-feature-for-adding-removing-users-to-concerts-trebuchet-method/82930
**Category:** Ask for Help
**Created:** [July 4, 2025, 7:41am UTC](https://community.glideapps.com/t/help-admin-feature-for-adding-removing-users-to-concerts-trebuchet-method/82930 "2025-07-04T07:41:03Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Adrian1](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/adrian1/32/83354_2.png) [@Adrian1](https://community.glideapps.com/u/Adrian1)
#### Post date: [July 4, 2025, 7:41am UTC](https://community.glideapps.com/t/help-admin-feature-for-adding-removing-users-to-concerts-trebuchet-method/82930/1 "2025-07-04T07:41:03Z")

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Hi everyone! 👋

I’ve been building an app in Glide where users can sign up for and leave concerts. It’s working well for regular users, but I’m stuck trying to implement an **admin feature** that allows adding and removing users from concerts manually.

### **My setup:**

I have two tables — all using RowID:

**Concerts**

- RowID
- Array+newItem (Make Array)
- Array-item (Remove Element)

**Users**

- RowID
- Role (Text: either _Admin_ or _Member_)
- Favorites (Multiple files)

I’m following the **Trebuchet method** described by Robert Petitto (great video tutorial here: [https://youtu.be/L1giKujUHxo?si=1VTbiJelSm5cAWI5](https://youtu.be/L1giKujUHxo?si=1VTbiJelSm5cAWI5))

### **The problem:**

I can’t figure out how to create a working **admin UI** to let me:

- Add users to a concert
- Remove users from a concert

I’ve tried using a **Form Container** with a **Choice component** , but I’m struggling to understand how I can write to the columns I need to update (such as the array columns, or the relation columns that determine which users are linked to which concerts).

It’s becoming frustrating because everything else works — I just can’t make this part function as intended.

I really appreciate this community and all the amazing support I’ve seen here. Hopefully someone has a smart solution or example I can follow. 🙏

**Final question:**

Should I switch to using a separate **Participants table** where I can simply “add row” and “delete row” instead of trying to make the Trebuchet method work for this?

Thanks in advance!

– Adrian

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### 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: [July 5, 2025, 12:25am UTC](https://community.glideapps.com/t/help-admin-feature-for-adding-removing-users-to-concerts-trebuchet-method/82930/2 "2025-07-05T00:25:15Z")

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> [@Adrian1](#):
>
> Should I switch to using a separate **Participants table** where I can simply “add row” and “delete row” instead of trying to make the Trebuchet method work for this?

This should be the most straightforward approach, if rows count isn’t a problem for you. Trebuchet is intended to be used mostly to save rows.

In your approach, do you mean you’re storing the IDs of concerts a person is going to in the “Favorites” column of Users?

What is your ideal frontend flow for the **admin feature** that allows adding and removing users from concerts? Do you do that from the concerts side or the users side?