Controlling link type per field

[maxime-rainville]

Story

As a Developer I want the ability to control what Link Type are accepted on a given Link Field so that I can prevent user from selecting nonsensical link type.

Acceptance criteria

• Individual LinkField have a configuration option to exclude/include specific link type.
• Link type are auto detected from the child class of Link.
• "Link Registry" concept is removed.

Note

• A good approch to implementing this is that possible link types are passed as props on the React component rather than an GraphQL query. AnyFiled has a good example of this implementation.
• The current implementation passes link type via a GraphQL query that can not be customised for individual links.
• There's a implementation of the allow/deny link type on the gorriecoe/silverstripe-linkfield module.

Things that were considered and rejected

• LinkField that point to a relation with a specific Link Type only accept this Type
• Allow specific link type to be turn off by default

Pull requests

• NEW Set allowed link types #86 (Experimental / Draft)
• NEW Allowed link types #137

[maxime-rainville]

I think removing registry through this card makes a lot of sense because managing possible link type is intertwined with controlling what type of links can be created via a specific field.

AnyField does the "Possible link types are passed as props on the React component" pretty well I think. So we should look there for inspiration.

I'm not sure about those two ACs.

• (LinkField that point to a relation with a specific Link Type only accept this Type)
  • That's very intuitive for the developer, but getting AnyField to autodetech relationship type was a massive pain on the back side.
• (Allow specific link type to be turn off by default)
  • The idea here is that maybe you have a very esoteric LinkType that most LinkField shouldn't accept.

[maxime-rainville]

All done.