How to create local task links

my_module.links.task.yml

my_module.my_local_task_link:
  route_name: my_module.custom_route
  title: "Title"
  base_route: route_where.local_task.should_be_placed

Issue:

You want to create a local task link with a specific custom route.

Solution:

To create a local task link, define it in my_module.local.task.yml, optionally accompanied by my_module.routing.yml and MyCustomController.php. Alternatively, you can use existing routes, specifying route_name as the target of the link and base_route as the location where the link should appear.

Explanations for the most important properties in yml files

my.module.links.task.yml

yml property	Description
`my_module.my_local_task_link`	Machine name of the link.
`route_name`	The route the link leads to.
`title`	Human readable title of the link. Is shown on buttons or menu links.
`base_route`	Base route where the link is placed on.

my_module.routing.yml

yml property	Description
`my_module.custom_route`	Machine name of the registered route.
`path`	Path in URL.
`defaults`	Default values for the upcoming properties.
`_controller`	Namespace of the controller that handles the logic when the route is accessed.
`_title`	Human readable title of the route.
`requirements`	Requirements that must be met to access the route.
`_permission`	Permission that must be fulfilled to access the route.

See the official Drupal documentation for further in-depth information.

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