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Posted

Is it possible to ensure that the data entered by a customer into a certain custom field is unique. Ie. checked against previous stored entries? To give an example, I don't want two customers with the same postal/zip code (this postal/zip code will be an added custom field).

Can this be done through the JSON input rules?

Posted

No, the input rules in the Universal Module couldn't handle this because it would require the use of a custom, user-defined, method to evaluate the uniqueness of a field by querying the database.

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