Ruby on Rails

Hi, I have a very beginners understanding of rails and ruby and I keep
getting stuck. Some previous posts have helped me a great deal but I now
have a different issue and so I thought I should start another post with
a different topic.

I am making an appointment booking app and I have a very basic design. I
have created an appointments scaffold with name:string phone:string
email:string numpeople:integer date:date timeslot:string. On the view
for creating a new appointment I have stated that appointment 1 is
9-11am, appointment 2 is 12-2pm, appointment 3 is 3-5pm and appointment
4 is 5 - 7pm. The user is asked to enter 1,2,3 or 4.

When the user clicks on "make appointment" I'm trying to interrupt the
appointments controller (create method)  so that I can check if the date
&& timeslot are nil. if that is the case, the system should continue on
to create the appointment, if not then I want to redirect to somewhere
else. I have created a method called isValid? in the model (See below)

I think the method is correct as the system is getting as far as the
redirect. The problem is, it keeps redirecting to the page I told it to
go to if it's not saved(the homepage or root_path). (Also the
appointments are not saving).

So, there now seems to be an issue with saving the appointment data to
the database.

If anyone could give me some pointers, I would be so, so grateful!

CODE:

appointments Model:
class Appointment < ActiveRecord::Base

  def isValid?
    taken= Appointment.where("date = ? && timeslot = ?", date,timeslot)
     Appointment.save unless taken
  end
end


appointments controller:

def create
    valid = @appointment = Appointment.new(appointment_params).isValid?

      respond_to do |format|
      if valid
        format.html { redirect_to new_appointment_path, notice:
'Appointment was successfully created.' }
        format.json { render :show, status: :created, location:
@appointment }
      else
        format.html { redirect_to root_path, notice: 'That appointment
is not available, please choose again' } # this redirect works with no
notice
        format.js { render json: @appointment.errors, status:
:unprocessable_entity }
      end
    end
  end

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