Fatal error: Call to undefined function date_field_widget_settings_form_validate() in form.inc

Glad you figured that out. Let's close this issue, but I'll re-name it so people can find it.

Alright. I debugged it and found the problem: Date module is lazy loading the validation handlers, even if it shouldn't do it that way.

Scenario:

1. Date module is asked to build the form with some #element_validate entries. It includes date_admin.inc that has the validation handlers.
2. Field label plurals adds some ajax to the form.
3. The user triggers an ajax request.
4. FAPI is executing #element_validate handlers, but since this is a new request date_admin.inc has not been included.

Instead Date module should keep its promise to FAPI and have the validation handlers around. Form builder available <=> validation handlers available.

Here's a patch that would solve this by moving the validation handlers next to the form builder stubs.

(Test failures look unrelated.)

I ran into the same error. The patch in #3 applied cleanly for me and I don't see any more errors when I created the date field.

Hope that helps

Works for me too.

#3: 1699312-element-validation-handler-loading-3.patch queued for re-testing.

Here is an updated working patch (at least for the fatal I got) hope this helps.

Normal, I did a stupid stupid typo error, uploading new one!

As a side note, this does not only do a fatal when using the Field Label Plurals module, we experienced it without.

I applied #12 to Date 2.6 and it took care of the error for me.

12: 1699312-12-date_field_validate_fatal.patch queued for re-testing.

This seems to be a more generic issue that happens with other modules as well. One example is Field Display Label. Updated the issue summary to include it as an example and the issue title to be more generic.

Here is a reroll of #12

Here is a reroll of #3

And back to NR

Well that sucks, anybody know why the patches are failing?

The "Field Label Plurals" module does seem to be the culprit. If I disable it -- no error. If I enable it and try to edit a date field -- error. Unfortunately, I need the plurals module; the only temporary solution seems to be to disable (deactivate) the plurals module, modify the date field, then reactivate (re-enable) the plurals module.

Not a great solution -- but one that works (for now).

The "Field Label Plurals" module does seem to be the culprit.

Got the error without.

This also appears for Multivalue Settings module.

I've tried to resolve this issue today. I've checked latest patch and I was able to apply it without problems. What I've done is just a moving of helper functions witch were related to the form stuff.

For me this bug occurs when altering the date field instance form and introducing AJAX. When the AJAX response is generated only date.field.inc is loaded which contains the main date_field_instance_settings_form. For some bizarre reason the form validate handler and some helper functions that are uniquely used in this form are located in a different file date_admin.inc which is not included in this page request.

I reviewed the patch. It solves the issue responsibly. Not a single line of code is changed, it just moves the validate handler and helper functions into the right file.

#31 works for me.

This is also a problem with the Required by role module. Ran the patch in #31 against date 2.8 and it solved the problem.

I have the same issue:

Fatal error: Call to undefined function date_field_widget_settings_form_validate() in /homepages/5/d578771729/htdocs/smq/includes/form.inc on line 1465 

but i don't have the fields plural plugin.

Re-rolled. But not a strict re-roll. I just touched the validation functions and instead of moving them to date.field.inc entirely, I just followed the pattern set forth for the form-building methods (so as to limit amount of code included).

We also had the same problem, but the field plural module was not installed. So I'm assuming this bug can have multiple different causes.

The patch from #38 works perfect and solves the "Fatal error: Call to undefined function date_field_widget_settings_form_validate()" error for us. Thanks all!

Updating status to RTBC. Can we get this committed please?

#38 is merged. Thanks