controller.rb

  def create
    @rental_agreement = RentalAgreement.new(params[:rental_agreement])

    # UserMailer.rental_email(current_user, @rental_agreement.tool_id).deliver

    respond_to do |format|
      if @rental_agreement.save
        format.html { redirect_to rental_agreement_path(id: @rental_agreement.id), notice: 'Rental agreement was successfully created.' }
        format.json { render json: @rental_agreement, status: :created, location: @rental_agreement }
      else
        format.html { render action: "new" }
        format.json { render json: @rental_agreement.errors, status: :unprocessable_entity }
      end
    end
  end