How to let members add only 1 item?

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1

Hello

I need to know how I can permit members to add only 1 item in a collection, which they can change or delete, but can not add 2 items.

2

When a member adds an item into the collection, the member ID is stored in the _owner field.

When a customer clicks submit button, you can check if the entry with such member ID exists in the collection (e.g. query it) and based on the result either submit the item or display an error for example.