Controller : render

render.rb

respond_to do |format|
  if @magazine.save
    format.html { redirect_to @magazine, notice: 'Magazine was successfully created.' }
    format.json { render json: @magazine, status: :created, location: @magazine }
  else
    format.html { render action: "new" }
    format.json { render json: @magazine.errors, status: :unprocessable_entity }
  end
end
    
def show
  @magazine = Magazine.find(params[:id])

  respond_to do |format|
    format.html # show.html.erb
    format.json { render json: @magazine }
  end
end

render2.rb

    render :json => {:notify_message => I18n.t('pages.not_found.body') },:status => 404