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How to properly check in entity form validation if field is empty?

I have a content type “A” (Node entity type). In it’s node form (new/edit) I need to check if some fields are empty or not (which are not required in general). My first intention was to use FormState “getValue”, “isValueEmpty”, “hasValue” functions, but I can’t figure out how to easily solve this problem:

  • Text fields has value: array("value"=> "") if they are empty, and it’s not considered empty by the functions above (so I can’t use them)
  • I could check by myself for isset($field['value']), but there are also file fields and entity reference fields which has a whole different “value” structure.

So what would be a clean way to achieve this?

This article was republished from its original source.
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How to properly check in entity form validation if field is empty?

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