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for my form I ask users to find out information about certain things, and at the bottom of the form I have a single text line with a [display_name] attribute in it, so that users submitting the information can be credited.
but because a lot of the information in the form may be unknown by the user they can leave blank fields, and my hope is that other users can come along and edit the submitted form and fill in these fields, and also receive credit.
I want my single text line with a [display_name] attribute in it, not be edited but allow new updaters of the form to also insert their username in the field and receive credit?
I have been told "You would need to use custom code for this to automatically add their display name if it's not already there. Use this hook, but change "new" to "edit".