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Does Drupal 8 support referential integrity? Can I tell Drupal what it should do if a parent row in a content type is deleted? For example:

  • I could tell Drupal not to allow the deletion of a parent row if it has child rows
  • I could tell Drupal to delete all child rows that belong to a parent row when that parent row is deleted

By row I mean an item of a content type. For example, if the content type is Book, a row is the data about one book.

  • Welcome to Drupal Answers! I must admit I don't understand your question. What rows? – leymannx Sep 21 '18 at 8:27
  • @leymannx I think they are called "nodes" in Drupal, not sure. – user89571 Sep 21 '18 at 8:50
  • Are you sure, then please update your question accordingly. Otherwise it would be better to find that out yourself first and then come back and clarify. – leymannx Sep 21 '18 at 8:52
  • You should simply try it out yourself. What happens when you try to delete a node that's referenced by another node? Does it work? As far as I remember this isn't possible. But I might be wrong. Please just try it out yourself instead of letting us try it out for you. – leymannx Sep 21 '18 at 10:52
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No, there's no such feature out of the box.

For D7, there is a module for that, but I haven't see a Drupal 8 version: https://www.drupal.org/project/erri.

We did build something like that ourself based on the entity_usage module, we alter the node delete form and display a warning that shows where the node is used.

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    A Drupal 8 module which facilitates the enforcement of entity references is drupal.org/project/erg. It is abandoned but the approach taken seems solid enough. – stevekeiretsu Sep 22 '18 at 0:48

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