Ruby on Rails

This solution gives an error:
undefined local variable or method `date' for #<AppointmentsController:

@appointment = Appointment.where("date = ? && timeslot = ?", date,
timeslot).first_or_initialize

Basically, I want to not create double appointments for the same date
and time, and I want to save them if they're not double bookings.

There must be an easier way??

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