how to use read_data to check the uniqueness of a value

hilmata 12 Apr, 2018
how to use a read_data to know if data entered in a field does not already exist in the database?

I have difficulties with read_data. I have a text field 'number' for which I must check if its value exists or not in the database. If so, it returns an error. To do this I decided to use a read_data. But I have the impression that the formula does not return a result. Tell me too if I have to put the formula in the 'submit' event. also tell me how to trigger the error when an item is found in the database
healyhatman 12 Apr, 2018
The read_data action has an "events" tab - you're looking for "found".
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