A model's key, which is what a derived show, edit, update and destroy all read out of the path. It is here rather than in Id's companion because FromPath is this module's and Id is core's, which cannot see it.
A model's key, which is what a derived show, edit, update and destroy all read out of the path. It is here rather than in Id's companion because FromPath is this module's and Id is core's, which cannot see it.
