Ruby on Rails

I have a users (Devise) and apointments table. I want to add a link in
my application.html.erb to link to that particular user's appointment,
so they can have the option to change it. (As a customer).

I have a similar link set up for them to edit their profile.

<%= link_to 'My Appointments',
appointment_path(current_user.appointment) if current_user.appointment
%>

Profile works:
<%= link_to 'My Profile', profile_path(current_user.profile) if
current_user.profile %>


However the appointments link won't work. It gives the error:
Couldn't find Appointment with
'id'=#<Appointment::ActiveRecord_Associations_CollectionProxy:0x007ffaa5999b28>

Appointment belongs to user
user has many appointments
profile belongs to user
user has one profile

My code is as follows:


 def index
    @appointments = Appointment.all
  end


  def show
    @appointment = Appointment.find(params[:id])

  end

  def new
    @appointment = Appointment.new
  end

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