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I've created an entity reference field formatter. It works fine. However, the field formatter will only work properly on entities of type user, so if the referenced entity type is different, I don't want the formatter to appear in the list of options.

I tried adding entity_types = { user } to my annotation for the formatter, but this didn't work. I'm suspecting it cannot even be done, but I thought I'd ask here before opening up an issue in core, to suggest it for future development.

Does anyone know if this can be done, and if it can, how?

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I think this will work...

There is an isApplicable() method in Drupal\Core\Field\FormatterBase. You can implement it in your FieldFormatter class like this:

public static function isApplicable(FieldDefinitionInterface $field_definition) { return ($field_definition->getFieldStorageDefinition()->getSetting('target_type') == 'user'); }
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  • Nice! That worked like a dream. I was looking at annotation, without even considering methods on the class. Much appreciated. Commented Apr 12, 2017 at 1:27
  • With the same approach we can limit the field formatter to a specific field? Commented Apr 12, 2017 at 15:40
  • If the answer is very different I can post a question, so, let my know Commented Apr 12, 2017 at 15:41
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    Try changing: getSetting('target_type') to getName() to select based on the field machine name. If you look at the FieldDefinitionStorageInterface in the API, you'll see other available options as well. Commented Apr 12, 2017 at 17:33
  • That's perfect, but what do I do if I only want to target "entity references that reference [my entity type]". Currently I can only target a specific field TYPE or a specific FIELD. I want to target "fields that reference a type". Sounds hard :/ Commented Sep 24, 2018 at 15:55

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