What is the backend_overridable service tag usable for?

Kevin

2/9/24, 5:13 PM

On some core services, I see they have a tag of backend_overridable. I see this changelog, but is there an example?

https://www.drupal.org/node/2306083

Is that essentially what something like Memcache is doing?

$settings['cache']['default'] = 'cache.backend.memcache';

1 + 0

symfony-services

Score:0

Drupal

4uk4

2/9/24, 6:58 PM

This is an example:

views/views.services.yml

  views.date_sql:
    class: Drupal\views\Plugin\views\query\MysqlDateSql
    arguments: ['@database']
    tags:
      - { name: backend_overridable }
  pgsql.views.date_sql:
    class: Drupal\views\Plugin\views\query\PostgresqlDateSql
    arguments: ['@database']
    public: false
  sqlite.views.date_sql:
    class: Drupal\views\Plugin\views\query\SqliteDateSql
    arguments: ['@database']
    public: false

Which makes it possible to query dates differently depending on the default backend.

Cache bins can have a default backend, too. But this has a different meaning and can be overridden as described here https://www.drupal.org/node/2754947.

+ 0

Elon Musk

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EN: What is the backend_overridable service tag usable for?

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