Surface isUnique constraint errors in Admin UI

[jesstelford]

Dependent on #431

When attempting to create an item which violates a unique constraint, the Admin UI does not surface any errors:

Similarly for update mutations.

[molomby]

Relates to #245. We need a way of bubbling errors and validation messages up from the adapter/hooks/etc. out into the admin UI.

[molomby]

Fyi, there are docs coming on how this stuff will work. Don't jump in and fix this without speaking to me please! :)

[molomby]

#1857 fixed this for Mongo, not generally. We still get ugly messages on the Knex adapter:

This is also an example of a much further reaching security issue whereby GraphQL errors leak system internals (#2303).

[stale]

It looks like there hasn't been any activity here in over 6 months. Sorry about that! We've flagged this issue for special attention. It wil be manually reviewed by maintainers, not automatically closed. If you have any additional information please leave us a comment. It really helps! Thank you for you contribution. :)

[bladey]

Keystone 5 has officially moved into active maintenance mode as we push towards the next major new version Keystone Next, you can find out more information about this transition here.

In an effort to sustain the project going forward, we're cleaning up and closing old issues such as this one. If you feel this issue is still relevant for Keystone Next, please let us know.