Drupal 8 snippets for different functionality

1.dynamic-links-action.md

Dynamic Link Action

1. Add a class under plugin/Derivative by extending \Drupal\Component\Plugin\Derivative\DeriverBase
2. Add to *.links.action.yml
3. Example:

field_ui.field_storage_config_add:
  class: \Drupal\Core\Menu\LocalActionDefault
  deriver: \Drupal\field_ui\Plugin\Derivative\FieldUiLocalAction

2.dynamic-links-task.md

Dynamic Link Task

1. Add a class under plugin/Derivative by extending \Drupal\Component\Plugin\Derivative\DeriverBase
2. Add to *.links.task.yml
3. Example:

field_ui.fields:
  class: \Drupal\Core\Menu\LocalTaskDefault
  deriver: \Drupal\field_ui\Plugin\Derivative\FieldUiLocalTask

3.dynamic-permission.md

Dynamic Permissions

1. Add a class with public method to return an array of permission(s)
2. Add to *.permissions.yml
3. Example:

permission_callbacks:
  - Drupal\field_ui\FieldUiPermissions::fieldPermissions

4.dynamic-route.md

Dynamic Permissions

1. Add a class under Routing by extending \Drupal\Core\Routing\RouteSubscriberBase
2. Add to *.services.yml
3. Example:

field_ui.subscriber:
    class: Drupal\field_ui\Routing\RouteSubscriber
    arguments: ['@entity.manager']
    tags:
     - { name: event_subscriber }

5.access-check.md

Access Check

1. Add a class under Access by extending \Drupal\Core\Routing\Access\AccessInterface
2. Add to *.services.yml
3. Example:

  access_check.field_ui.form_mode:
    class: Drupal\field_ui\Access\FormModeAccessCheck
    arguments: ['@entity.manager']
    tags:
     - { name: access_check, applies_to: _field_ui_form_mode_access }