Everything until line 7 works. I want [context] to be 'appkeys'. #this one works bundle.appkeys << dropped #this one doesn't bundle[context] << dropped I get this error: NoMethodError: undefined method `<<' for #<Bundle:0x007fe7addcca20>

gistfile1.rb

  def ajax_add_to_bundle
    #params = { bundle_id: 1, droppedid: 1, context: 'appkey' }
    bundle = Bundle.find(params[:bundle_id])
    context = params[:context]
    droppedid = params[:droppedid]
    dropped = eval(context).find(droppedid)
    bundle[context] << dropped
    bundle.save
    render :nothing => true
  end