When uploading a file I get the following error:

    Warning: Invalid argument supplied for foreach() in file_field_widget_submit() (line 756 of /modules/file/file.field.inc).
    Warning: array_values() expects parameter 1 to be array, null given in file_field_widget_submit() (line 763 of  /modules/file/file.field.inc).

I came across this bug while building a similar file upload field for http://drupal.org/project/recline . I thought I was doing something wrong. I ended up getting rid of it by including the choices I was associating with the field field within the same array as the file: http://drupalcode.org/project/recline.git/blob/refs/heads/7.x-1.x:/recli...

When I saw the same error on OpenData I decided to do some more digging and found that this might be a regression that was introduced in Drupal 7.9: http://drupal.org/node/1329856

From looking at your code I think you did things correctly and imagine you did them before that regression was introduced. Anyway will post some more info as I come across it. Would be great to figure out how to correctly add additional elements to file uploads without that error message. Can you reproduce this?

Comments

webstudiodelta’s picture

webstudiodelta commented

I am having this issue as well, file attach field is being rendered into a form using field_attach_form() and upon upload it gives me the same two errors you are getting when I hit the upload button. The form will submit and the file will be added but the errors are unsightly and troubling. I also get this warning after submission:

Notice: Undefined index: career_app_form in career_inquiry_ticket_user_form_submit() (line 609 of /opt/dev/kazaamprojects/unitedchem/web/sites/all/modules/custom/career_inquiry/career_inquiry.module). =>

The real quandary is that I get no errors when I use the administration /add form that I created for the same entity and the forms are nearly identical.

EDIT: I have narrowed the case even further

in my form using this line to attach the file field works:
field_attach_form('career_inquiry_ticket', $entity, $form, $form_state);

however this line (which adds field grouping for ajax submission) results in the two errors the OP and I are both getting:
field_attach_form('career_inquiry_ticket', $entity, $form['career_app_form_wrap']['career_app_form'], $form_state);