Preview in Create Article gives error

Updated: Comment #10

Problem/Motivation

Steps to reproduce:

1. New install of D8

2. Go to "Add Content"

3. Choose "Article"

3. Enter a title, hit "Preview" button

4. Gives error page with this error:

Drupal\Core\Entity\EntityMalformedException: The "node" entity type has not been saved, and cannot have a URI. in Drupal\Core\Entity\Entity->urlInfo() (line 148 of core/lib/Drupal/Core/Entity/Entity.php).

This only happens with Article. Basic page and created content types work as expected.

Proposed resolution

The difference between article and other content types defined by standard profile is the field_image field. The problem occurs in \Drupal\image\Plugin\Field\FieldFormatter\ImageFormatter::viewElements():

    $image_link_setting = $this->getSetting('image_link');
    // Check if the formatter involves a link.
    if ($image_link_setting == 'content') {
      $uri = $items->getEntity()->urlInfo();
      // @todo Remove when theme_image_formatter() has support for route name.
      $uri['path'] = $items->getEntity()->getSystemPath();
    }

call to Drupal\Core\Entity\Entity::urlnfo() fails, since it contains this check in the very beginning:

    if ($this->isNew()) {
      throw new EntityMalformedException(sprintf('The "%s" entity type has not been saved, and cannot have a URI.', $this->getEntityTypeId()));
    }

Proposed solution is to check if $entity->isNew() before trying to get it's uri

Remaining tasks

Test has been added

User interface changes

No change in UI

API changes

No change in API