Error when using links:

[Luke Norman]

I have a representer for my Location model. A location has many Observations. I would like a link to each observation, like below:

• {

  • id: 1,
  • latitude: 40,
  • longitude: 50,
  • _links: 

    {

    • : 

      [

      • {

        • href: "/observation/1"

        },
      • {

        • href: "/observation/2"

        }

      ]

    }

  },

My representer is below:

#This is decorator-style roar. To use, return LocationRepresenter.new(Location)

class LocationRepresenter < Representable::Decorator

  include Roar::Representer::JSON::HAL

  property :id

  property :latitude

  property :longitude

  links :observation do

    represented.observation.map {|o| {rel: nil, href: "/observation/#{o.id}"}}

  end

end #class LocationRepresenter

when I run this, I get the following error:

13:45:42 web.1  | Unexpected error while processing request: undefined method `rel' for nil:NilClass

13:45:42 web.1  | /home/luke/.rvm/gems/ruby-2.0.0-p247/gems/roar-0.12.0/lib/roar/representer/json/hal.rb:139:in `rel'

13:45:42 web.1  | /home/luke/.rvm/gems/ruby-2.0.0-p247/gems/roar-0.12.0/lib/roar/representer/feature/hypermedia.rb:113:in `add'

I've asked on IRC, but I can't understand what I'm doing wrong. Any help greatly appreciated!

[Luke Norman]

Modifying the following lines in hal.rb fixes this issue for me - not sure if this is a bug, or a problem with the way I'm implementing things:

        class LinkArray < Array

          def rel

            if(first)

              first.rel

            else

              nil

            end

          end

          def rel=(rel)

            each { |lnk| lnk.rel = rel }

          end

        end

[Nick Sutterer]

Hi Luke, sorry for the late reply. This seems to happen when the array you compile is empty. Someone else already filed a bug report: https://github.com/apotonick/roar/issues/80

Nick

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