Q:

How to link to controller method

I'm following this answer on how to clone a record.
I can't though workout how to phrase the link and route it.
It is in my @miniature show view so I thought it should be something like
<%= link_to 'clone', :controller => :miniatures_controller, :action => :clone %>

and the route
  match 'clone', to: 'miniatures#clone', via: 'get'

but this is clearly wrong. I am using @miniature in place of the above answer's @prescription.

A:

What if you just use clone_path:
<%= link_to 'clone', clone_path %>

Cause rake routes shows just clone route. It works with the same routes.
If you are not satisfied with route and you should pass parameters (like miniature_id), add member to your resource (probably nested), like:
resources :miniatures do
  member do
    get 'clone'
  end
end

This will be clone_miniature_path where you should pass @miniature:
<%= link_to 'clone', clone_miniature_path(@miniature) %>

