By bnjmnm on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
10.2.x
Introduced in version: 
10.2.0
Issue links: 
https://www.drupal.org/node/3373653
Description: 

The Symfony Choice validation constraint is now available for use in Drupal core schemas. Like all config validation constraints, This can be used in any schema definition like

some_definition:
  # whatever
  constraints:
    Choice:
      # choice options go here. Refer to the Symfony docs for  
      # all available options. This example uses 'callback'.
      callback: 'Drupal\Some\Callback\Class::getThoseOptions'

something_else
  type: string
  constraints:
    # Only two possible values are accepted.
    Choice:
      - un
      - all

And this will enforce the config having a value exists within the value returned by the Choice: callback or choices option (the latter is the default option, so it is possible to omit that key).

Impacts: 
Module developers