Problem

Field definitions and typed data definitions have an isReadOnly() method. However, right now isReadOnly() is not taken into account anywhere, e.g. for validation or access checking (as discussed at #2099259: Missing default access for all taxonomy term fields).

Proposed resolution

Discuss options, decide which one to use, document and apply it.

Remaining tasks

See above.

User interface changes

-

API changes

tbd

Comments

fago’s picture

Right now, for nodes read-only is set on node nid, uuid, vid and type. However, uuid and type fields should be settable during creating, while nid, vid and more read-only fields like changed, revision-timestamp which shouldn't be settable during creation - unless for migrate use-cases.

So we've got two flavours of read-only fields:

  • a) Settable during creation (uuid, type)
  • b) Settable via migrate only (nid,vid,changed,revision-timestamp)

Then, it probably depends on the storage whether a read-only field is still writable by migrate. I'm not sure it's necessary to cover that difference in the metadata as migrate already does fine without it.

In order to apply the read-only flag we could:
- disallow 'edit' for read-only fields
- validate read-only fields are not changed, i.e. compare its value to the original entity on update
- validate read-only fields are never set, i.e. in addition to verifying that they are not changed we could make sure there is no value for them when validating a new entity.

The first two points make sense for both variants a) and b), the third one does only for group b).

So the main question left here is: How do we handle fields that are settable during creation like uuid and type?

Variant A: We differentiate and mark them as "create+ready only"
Variant B: Mark them as read-only as well and make real read-only fields have an additional constraint? We could have a read-only validation constraint which has an option to allow setting during create. Then, those ready-only fields could override the default constraint by setting it that way.

heddn’s picture

Version: 8.0.x-dev » 8.1.x-dev

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larowlan’s picture

I think UUID should be settable on unsaved entities, not necessarily through creation.

I.e $entity->isNew() === TRUE is same as through ::create

Version: 8.1.x-dev » 8.2.x-dev

Drupal 8.1.9 was released on September 7 and is the final bugfix release for the Drupal 8.1.x series. Drupal 8.1.x will not receive any further development aside from security fixes. Drupal 8.2.0-rc1 is now available and sites should prepare to upgrade to 8.2.0.

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Berdir’s picture

Wim Leers’s picture

cilefen’s picture

Issue summary: View changes

Version: 8.2.x-dev » 8.3.x-dev

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Wim Leers’s picture

Version: 8.4.x-dev » 8.5.x-dev

Drupal 8.4.4 was released on January 3, 2018 and is the final full bugfix release for the Drupal 8.4.x series. Drupal 8.4.x will not receive any further development aside from critical and security fixes. Sites should prepare to update to 8.5.0 on March 7, 2018. (Drupal 8.5.0-alpha1 is available for testing.)

Bug reports should be targeted against the 8.5.x-dev branch from now on, and new development or disruptive changes should be targeted against the 8.6.x-dev branch. For more information see the Drupal 8 minor version schedule and the Allowed changes during the Drupal 8 release cycle.

Version: 8.5.x-dev » 8.6.x-dev

Drupal 8.5.6 was released on August 1, 2018 and is the final bugfix release for the Drupal 8.5.x series. Drupal 8.5.x will not receive any further development aside from security fixes. Sites should prepare to update to 8.6.0 on September 5, 2018. (Drupal 8.6.0-rc1 is available for testing.)

Bug reports should be targeted against the 8.6.x-dev branch from now on, and new development or disruptive changes should be targeted against the 8.7.x-dev branch. For more information see the Drupal 8 minor version schedule and the Allowed changes during the Drupal 8 release cycle.

Wim Leers’s picture

Per #6, #7 and #11, tagging API-First Initiative.

#2907629: Read-only behaviour of data definitions is not clear is related too, thanks chx for pointing there!

Version: 8.6.x-dev » 8.8.x-dev

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Drupal 9.4.9 was released on December 7, 2022 and is the final full bugfix release for the Drupal 9.4.x series. Drupal 9.4.x will not receive any further development aside from security fixes. Drupal 9 bug reports should be targeted for the 9.5.x-dev branch from now on, and new development or disruptive changes should be targeted for the 10.1.x-dev branch. For more information see the Drupal core minor version schedule and the Allowed changes during the Drupal core release cycle.

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Drupal core is moving towards using a “main” branch. As an interim step, a new 11.x branch has been opened, as Drupal.org infrastructure cannot currently fully support a branch named main. New developments and disruptive changes should now be targeted for the 11.x branch. For more information, see the Drupal core minor version schedule and the Allowed changes during the Drupal core release cycle.