Include/Exclude filter options for links

[dorellang]

I think it would be nice to skip or include links in the same way you can do it now with plain old properties; maybe something along the lines of
model.to_json include_links: :self
or even
model.to_json include: :self

Currently I have to resort to hackery like this in the representer

      class << self
        alias_method :_ye_olde_link, :link
        def link(rel, *args, &block)
          _ye_olde_link rel, *args do |opts|
            props = opts[:links_exclude] || opts[:links_include]
            if props
              ignore = props.include? rel
              ignore = opts[:links_include]? !ignore : ignore
            else
              ignore = false
            end
            ignore ? nil : instance_exec(opts, &block)
          end
        end
      end

And then call
model.to_json include: :links, include_links: [:self]
Not nice at all... It gets the job done though

[apotonick]

That's a cool idea! This should be pretty "straight-forward" by extending this: https://github.com/apotonick/roar/blob/master/lib/roar/hypermedia.rb#L59

The options hash is where you could specify the links to be in-/excluded.