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multi-select drop down field validation class


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I have multi-select drop down option and it is working fine.

I am storing values in database like "1,2,3". I was having 'validate' => 'isString' validation in class file for field.

Since field values now change, so this validation not working.

I want to know validation class to be used for multi-select option. (isString or isInt or isGenericName etc)

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Edited by Zohaib-fk
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