An idea for printing out available local variables and their attributes in a Rails view.

foo_controller.rb

class FooController < ApplicationController

  def index
    @foo = Foo.find(params[:id])
    @bar = Bar.find(params[:bar_id])
    @locals = @foo + @bar # this line and the locals view stuff gets removed when you're done developing
  end
end

index.html.haml

= render :partial 'shared/local', collection: @locals

local.html.haml

%pre
  %code
    = @local.try(:to_yaml)