Render templates without double render errors

rendering.rb

# render in before_filter

before_filter
  render 'template' and return
end

# Render conditional

def index
  respond_to do |format|
    if a
      format.html { render 'a' }
    elsif b
      format.html { render 'b' }
    else
      format.html # index.html.haml
    end
  end
end