gistfile1.coffee

GizmagAdmin.factory "proposalUtils", ($http) ->
  base_url = '/api/proposal/'
  transitions = ['submit', 'request_changes', 'reject', 'approve', 'accept']

  output =
    save: (proposal, opts={}) ->
      if proposal.id
        if opts.partial
          return $http
            method: 'PATCH',
            url: "#{base_url}#{proposal.id}/",
            data: proposal,
            headers: 'Content-Type': 'application/json'
        else
          return $http.put("#{base_url}#{proposal.id}/", proposal)
      else
        return $http.post(base_url, proposal)

  for transition in transitions
    output[transition] = (proposal) ->
      return $http.post("#{base_url}#{proposal.id}/#{transition}/")

  return output

you're then able to do

proposal = id: 123
proposalUtils.submit(proposal)