If you change the label of the title field for a content type, then unique validation on the title field does not work.
1. Create a new content type.
2. In the "Title field label" field, change Title to something else.
3. Enable unique validation.
4. Save content type.
3. Create a new record of the content type with title = "test". Save.
4. Create a 2nd new record of the content type with title = "test". Save. Unique validation should show an error and prevent the save, but does not.
I dug into this and found this information which led me to a solution: https://www.drupal.org/project/drupal/issues/3193351 🐛 Adding a constraint to a BaseField is broken if the basefield is overwritten Needs work
What happens is that after the title label is changed from the default "Title" to something else, the title field is considered a bundle field and the constraint must be added in hook_entity_bundle_field_info_alter().
Patch attached.
Fixed
1.0
Code
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Issue #3331345 by jdhildeb, fabiansierra5191: Doesn't work if title...
Automatically closed - issue fixed for 2 weeks with no activity.