I am making an app for my friend who is conducting a poll. He wants everyone to only add one vote. How can I let users only add one row to the app, then no more?
Please take a look at the valid_if expression for avoiding duplicates in the last section of the article below.
You could use that valid if on the email column of the user.
https://help.appsheet.com/en/articles/961274-list-expressions
I would more like to only show the action to add a new entry only if the useremail is not in my data set. Is there a way to do that?w
Search for "prevent duplicates"
Use the Only if this condition is true setting or the table's Add action.
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