There are modules which try to integrate with all (entity) forms and want to store data for a newly created entity upon form submission.

Node module's node_form() uses both button-level and form-level submit handlers, because it needs to take the "Preview" case into account, which does not create a new entity upon submit.

When hitting "Submit" (not Preview), then the button-level submit handler invokes all form-level submit handlers first. This means that the new node has not been saved yet, so form-level submit handlers do not have a 'nid' or $node to work with.

For example:

@@ -658,7 +658,18 @@ function mollom_form_alter(&$form, &$form_state, $form_id) {
      // Append a submit handler to store Mollom session data. Requires that
      // the primary submit handler has run already, so a potential 'post_id'
      // mapping can be retrieved from $form_state['values'].
      // @todo Core: node_form_submit() uses a button-level submit handler,
      //   which invokes form-level submit handlers before the node/entity is
      //   saved, so $form_state does not contain the new node ID yet. There is
      //   no #post_submit property or form processing phase, we could rely on.
      //   Potentially applies to other contrib entities, too.
      if (isset($form_state['build_info']['base_form_id']) && $form_state['build_info']['base_form_id'] == 'node_form') {
        $form_submit_key = &$form['actions']['submit'];
      }
      else {
        $form_submit_key = &$form;
      }
      $form_submit_key['#submit'][] = 'mollom_form_submit';

This is a can of worms.

There are various kinds of submit handlers:

  1. Submit handlers that want to tack submitted form values onto the $entity. Those should use #entity_builders instead.
  2. Submit handlers that must not run for previews.
  3. Submit handlers that want to run before the entity is saved, in order to adjust/manipulate whatever they need to do.
  4. Submit handlers that need to run after the entity was saved, in order to process or save corresponding data.

Comments

larowlan’s picture

subscribing (sorry)

franz’s picture

Can't we move all of these use cases for handlers in to entity_alter kind of hooks?

sun’s picture

Title: Figure out what to do with button-level and form-level submit handlers, entity building, and previews » Improve integration with entity form button-level and form-level submit handlers, form/entity (re-)building, and previews
Issue tags: +Entity system
sun’s picture

Priority: Major » Normal
sun’s picture

plach’s picture

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smustgrave’s picture

Status: Active » Postponed (maintainer needs more info)

Wonder after 12 years if still a valid task ?

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