How to set default value for entity reference field in hook_form_alter [closed]

Question

following snippet doesn't set the default value.

 $form['field_image']['#default_value']='default';

I Have content type called image and I'm trying to set the default value for a reference to it in another content type. The above code doesn't work. Printing out the form variable doesn't make it seem like an easy task.

Answer 1

You need to first check the structure of your form. Mine worked with the following:

$form['field_image']['widget'][0]['target_id']['#default_value'] = \Drupal\node\Entity\Node::load(2);

Cheers!

Answer 2

I had trouble with the above on 8.6.1 when using the Entity browser widget - looking at the form edit values I found that this worked for me:

      $form['field_business_partner']['widget']['target_id']['#default_value'] = 'node:18';

Simple string. Note it didn't display the requisite node in the field but as this was being programmatically set it didn't matter in my use case.

Answer 3

You have to set three things, 1 - node default value, 2 - Entity browser default value , And 3 - Item , Which will show in edit form, Without Assigned the items it's not displayed in entity browser, While in backed it is set when we check by kint() var, demo code in my case:

    $form['field_related_stories']['widget']['target_id']['#default_value'] = "node:25507";
    $form['field_related_stories']['widget']['entity_browser']['#default_value'] = Node::load(25507);
    $form['field_related_stories']['widget']['current']['items'] = array();