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If a field on the node edit form is a entity relation to a taxonomy term vocabulary, I want the taxonomy terms be restricted on certain conditions. I don't know how to do it safely. I have tried it in hook_form alter(). Deep in the "array stack" of the form variable is the definition of the entity reference form field.

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Is the only way to "hack" the "#process" array, or is there any object-oriented way to filter the items in the drop down element?
Is there any form "plugin" to filter the items in Drupal 8?

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You're deep in the field definitions there, that's the wrong place, you can't change anything there and you don't need to.

In case of a select, the available options are already part of the form; they should be in $form[$field_name]['widget'] somewhere.
You could also try to use hook_options_list_alter().

  • hook_options_list_alter() looks like perfect for this job. Thanks for the hint! – jepster Aug 28 '17 at 18:52
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    I thought it might. Note that the hook only applies to the widget. Meaning, you can use it to filter/remove options as well as change their labels, but you can't add options as they then wouldn't exist during validation/render – Berdir Aug 28 '17 at 19:34

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