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I have a Subscription custom entity and I would like to use the default entity form for administration tasks and a custom multistep form for the subscription process.

I added an address field to my Subscription entity and I would like to use the widget in one of the custom form steps.

I was expecting I could use something like '#type' => 'widget_id' plus some widget configuration, but it does not seem to be so simple as this answer points out.

a widget and a form element are two different things that are used in different cases; consider a widget a more specialized type of form element.

What would be the right approach then? In the field_attach_form change record a comment suggests

$display = EntityFormDisplay::collectRenderDisplay($entity, 'default');
$display->buildForm($entity, $form, $form_state);

How do I get just my address field? Form display modes?

And then, how do I deal with validating and storing the data properly?

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You can limit the $form array's elements by setting their #access property to FALSE.

The validation and storing should be handled by the form for the corresponding entity by itself.

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  • Thanks, @rémy, I was hoping for a more explicit method. Altering a whole form just to get a field seems a bit of a work-around, but you may well be right about this being the most proper method currently available. I will wait a few days before accepting your answer to see if we get some other ideas.
    – Esclapes
    Commented Mar 17, 2016 at 8:21
  • Thanks again. At the end I ended up using $display->buildForm and then restricting access with an admin permission check on some fields.
    – Esclapes
    Commented Mar 24, 2016 at 17:36

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