nil when trying to display data in rails app - ruby-on-rails

Question

I get this error when trying to show <%= #schedule.title %>, but when I do the same with <%= #lesson.title %> it is working fine for #lesson.
![undefined method `title' for nil:NilClass
]1
The flow is like this.
- A user signs up and creates a clinic, the clinic belongs to the user.
- A clinic has many practitioners and they belongs to the clinic.
- A practitioner has many lessons and schedules, and they belongs to the practitioner.
When I'm on the lesson show page, there is a link to a booking page. It's on this booking page that the error occours.
I know it's saying nil, but both lessons and schedules have been created for that specific practitioner.
Anybody knows why this is happening? I don't understand why I can access #lesson but not #schedule. Any help would be much appreciated.
routes.rb
resources :clinics do
resources :practitioners do
resources :lessons, :lesson_payments, :schedules do
resources :bookings do
end
end
end
end
schedules_controller.rb
class SchedulesController < ApplicationController
before_action :set_schedule, only: [:show, :edit, :update, :destroy]
# GET /schedules
# GET /schedules.json
def index
#schedules = Schedule.all
end
# GET /schedules/1
# GET /schedules/1.json
def show
end
# GET /schedules/new
def new
#schedule = Schedule.new
end
# GET /schedules/1/edit
def edit
end
# POST /schedules
# POST /schedules.json
def create
#schedule = Schedule.new(schedule_params)
respond_to do |format|
if #schedule.save
format.html { redirect_to clinic_practitioner_schedule_path(id: #schedule.id), notice: 'Schedule was successfully created.' }
format.json { render :show, status: :created, location: #schedule }
else
format.html { render :new }
format.json { render json: #schedule.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /schedules/1
# PATCH/PUT /schedules/1.json
def update
respond_to do |format|
if #schedule.update(schedule_params)
format.html { redirect_to clinic_practitioner_schedule_path(#schedule), notice: 'Schedule was successfully updated.' }
format.json { render :show, status: :ok, location: #schedule }
else
format.html { render :edit }
format.json { render json: #schedule.errors, status: :unprocessable_entity }
end
end
end
# DELETE /schedules/1
# DELETE /schedules/1.json
def destroy
#schedule.destroy
respond_to do |format|
format.html { redirect_to clinic_practitioner_schedules_url, notice: 'Schedule was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_schedule
#schedule = Schedule.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def schedule_params
params.require(:schedule).permit(:title, :start, :end, :practitioner_id, :account_id)
end
end
bookings_controller.rb
class BookingsController < ApplicationController
before_action :set_lesson, only: [:new]
def new
#account = Account.new
#user = User.new
#patient = Patient.new
#booking = Booking.new
#lesson_payment = LessonPayment.new
#schedule = Schedule.find_by_id(params[:id])
end
def create
create_patient_charge
create_patient_account
#user = User.new(user_params)
#user.account_id = #account.id
respond_to do |format|
if #user.save
create_patient_profile
create_patient_booking
create_patient_lesson_payment
auto_login(#user)
UserMailer.new_signup_booking_admin(#user, #booking).deliver_later
UserMailer.new_signup_booking_client(#user, #booking).deliver_later
format.html { redirect_to dashboard_url, notice: 'Your account was successfully created.' }
format.json { render :show, status: :created, location: #user }
else
format.html { redirect_back fallback_location: root_path, alert: 'An error occurred while sending this request.' }
format.json { render json: #user.errors, status: :unprocessable_entity }
end
end
end
private
def set_lesson
#lesson = Lesson.find(params[:lesson_id])
end
def user_params
params.require(:user).permit(:email, :password, :time_zone)
end
def create_patient_account
#account = Account.new()
#account.status = 'active'
#account.account = 'prefix-' + SecureRandom.hex(4)
#account.account_type = 'client'
#account.save
end
def create_patient_profile
#patient = Patient.new()
#patient.firstname = params[:user][:patient][:patient_first_name]
#patient.lastname = params[:user][:patient][:patient_last_name]
#patient.phone = params[:user][:patient][:patient_phone]
#patient.user_id = #user.id
#patient.account_id = #user.account_id
#patient.save
end
def create_patient_booking
#lesson = Lesson.find(params[:user][:booking][:lesson_id])
#booking = Booking.new()
#booking.lesson_id = params[:user][:booking][:lesson_id]
#booking.schedule_id = params[:user][:booking][:schedule_id]
#booking.patient_id = #patient.id
#booking.account_id = #user.account_id
#booking.title = #lesson.title
#booking.cost = #lesson.cost
#booking.status = 'Booked'
#booking.save
#schedule = Schedule.find(params[:user][:booking][:schedule_id])
#booking.practitioner_id = #schedule.practitioner_id
#booking.start = #schedule.start
#booking.refunded = 0
#booking.save
#schedule.title = 'Booked'
#schedule.save
end
def create_patient_lesson_payment
#lesson_payment = LessonPayment.new()
#lesson_payment.status = 'Paid'
#lesson_payment.date = Date.today
#lesson_payment.cost = #lesson.cost
#lesson_payment.service = #lesson.title
#lesson_payment.booking_id = #booking.id
#lesson_payment.account_id = #user.account_id
#lesson_payment.save
end
end
This is where I link to the booking page
show.html.erb
<p id="notice"><%= notice %></p>
<%= link_to new_clinic_practitioner_lesson_booking_path(:lesson_id => #lesson.id), class: "course-btn" do %><i class="fa fa-calendar-plus-o"></i> Book This Lesson<% end %>
<p>
<strong>Image:</strong>
<%= #lesson.image %>
</p>
<p>
<strong>Title:</strong>
<%= #lesson.title %>
</p>
<p>
<strong>Duration:</strong>
<%= #lesson.duration %>
</p>
<p>
<strong>Cost:</strong>
<%= #lesson.cost %>
</p>
<p>
<strong>Category:</strong>
<%= #lesson.category %>
</p>
<p>
<strong>Language:</strong>
<%= #lesson.language %>
</p>
<p>
<strong>Level:</strong>
<%= #lesson.level %>
</p>
<p>
<strong>Description:</strong>
<%= #lesson.description %>
</p>
<p>
<strong>Practitioner:</strong>
<%= #lesson.practitioner_id %>
</p>
<p>
<strong>Account:</strong>
<%= #lesson.account_id %>
</p>
<%= link_to 'Edit', edit_clinic_practitioner_lesson_path(#lesson) %> |
<%= link_to 'Back', clinic_practitioner_lessons_path %>
new.html.erb
<h1>New Booking</h1>
<%= render 'form', booking: #booking %>
<%= link_to 'Back', clinic_practitioner_lesson_bookings_path %>
_form.html.erb
<table class="table table-bordered">
<thead>
<tr>
<th>Slots In The User's Time Zone</th>
<th>Price</th>
<th>Service Provider</th>
<th>Booking Button</th>
</tr>
</thead>
<tbody>
<tr>
<td><%= #lesson.title %></td>
<td><%= #schedule.title %></td>
</tr>
</tbody>
</table>

Answer 1

I am noticing that in you are initializing #schedule like this in your bookings_controller new method:
#schedule = Schedule.find_by_id(params[:id])
But, you don't have any params[:id] in your parameters that are:
{'clinic_id'=>'50','practitioner_id'=>'27','lesson_id'=>'15'}
This is why your #schedule is nil
Assuming, there is a has_many association between practitioner and schedule, and you want to display the title of first schedule of the practitioner, you can do it it like this:
#schedule = Schedule.find_by_practitioner_id(params[:practitioner_id])