module Management class ConferencesController < ManagementController before_action :assign_conference, only: [:edit] def new @conference = Conference.new 3.times { @conference.tracks.build } end def create @conference = Conference.new conference_params @conference.save render :new end def edit end private def assign_conference @conference = Conference.find params[:id] end def conference_params params.require(:conference).permit [:title, :email, :start_date, :end_date, :description, tracks_attributes: [:id, :name, :color, :description, :_destroy]] end end end