11 - Add a relation between events and locations

[luca-rath]

Add a association between events and locations

Goal

After implementing the location management functionality in the Sulu administration interface, we want to add an
association between the Event entity and the Location entity. With this assignment we are completing our goal of
removing redundant location information inside of different events.

Steps

• Add a many-to-one association between the Event entity and the Location entity
• Don't forget to update your database schema with bin/adminconsole doctrine:schema:update --force
• Serialize the id of the associated location of an event as locationId (will be used in the controller afterwards)
• Add the logic for setting and modifying the locationId property in your src/Controller/EventController.php
• Configure a new single_location_selection field type in your config/packages/sulu_admin.yaml
• Add a property locationId with the type single_location_selection to your event_details form
• Log into the admin UI with user "admin" and password "admin"
• Navigate to an event and select one of your locations

Hints

• Run bin/adminconsole doctrine:schema:validate
• Run bin/adminconsole debug:config sulu_admin field_type_options.single_selection to get some insights on how to
  configure a single selection field type.

More Information

If you want to select a custom entity somewhere in your form, you need to use a respective field type for this
property. To simplify this process for the developer, Sulu includes an abstract selection and single_selection
field type. These abstract field types can be instantiated for your custom entity by providing respective
field_type_options in the configuration of your application.

Links

• Next assignment pull request: 12 - Add a location filter to the events overview page
• Source file of this assignment: assignments/11.md