def create
      authorize! :create, Arm
      @arm = Arm.new(arm_params)
      if @arm.save
        redirect_to @arm,
                    notice: "Arm was successfully created."
      else
        render :new
      end
    end
def create
      authorize! :create, Arm
      @arm = Arm.new(arm_params)
      if @arm.save
        redirect_to @arm,
                    notice: "Arm was successfully created."
      else
        render :new
      end
    end
POST /think_feel_do_dashboard/arms