Feature Request - Support params when generating HAL links #10627

Originally posted: https://github.com/grails/grails-core/issues/10627#issuecomment-339700566

@ZacharyKlein

> Currently HAL links don't support URL mappings that include parameters (see sample project), and fallback to default URLs that don't honor URL mappings.
>
> This request is to allow users to pass in a map of link parameters to be used when generating HAL resource links. Example:
>
> hal.render( linkParams: [:] )
> Sample project: https://github.com/ZacharyKlein/hal-url-mapping-issue

Start with the linked hal-url-mapping-issue sample project and trace HAL resource link generation alongside the URL mappings it exercises. Determine where link parameters would enter the HAL rendering path; done means mapped URLs with parameters are honored instead of falling back to default URLs, with coverage for the reported case.

Written by the indexing model from the issue text.