undefined method `amoeba' rails 5.2 - ruby-on-rails

Question

I'm following this tutorial for implementing a bookingsystem to my rails app. I'm currently stuck, because when I hit the 'New booking' button I get this error
undefined method `amoeba' for #<Class:0x00007fa37f7862a0>
![NoMethodError in BookingsController#create
]1
I have included gem 'amoeba' in my gem file, but it still doesn't work. Anyone know how to fix it? It would be very much appreciated.
schedule.rb
class Schedule < ApplicationRecord
# Tenant Of
belongs_to :account, :inverse_of => :schedules
accepts_nested_attributes_for :account
belongs_to :practitioner, :inverse_of => :schedules
accepts_nested_attributes_for :practitioner
has_many :bookings, :inverse_of => :schedule
accepts_nested_attributes_for :bookings
validates :start, uniqueness: { scope: :practitioner_id, message: "You have already made this time available" }
amoeba do
enable
exclude_associations :bookings
end
end
bookings_controller.rb
class BookingsController < ApplicationController
before_action :set_booking, only: [:show, :edit, :update, :destroy]
# GET /bookings
# GET /bookings.json
def index
#bookings = Booking.all
end
# GET /bookings/1
# GET /bookings/1.json
def show
end
# GET /bookings/new
def new
#booking = Booking.new
end
# GET /bookings/1/edit
def edit
end
# POST /bookings
# POST /bookings.json
def create
#booking = Booking.new(booking_params)
respond_to do |format|
if #booking.save
format.html { redirect_to #booking, notice: 'Booking was successfully created.' }
format.json { render :show, status: :created, location: #booking }
else
format.html { render :new }
format.json { render json: #booking.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /bookings/1
# PATCH/PUT /bookings/1.json
def update
respond_to do |format|
if #booking.update(booking_params)
format.html { redirect_to #booking, notice: 'Booking was successfully updated.' }
format.json { render :show, status: :ok, location: #booking }
else
format.html { render :edit }
format.json { render json: #booking.errors, status: :unprocessable_entity }
end
end
end
# DELETE /bookings/1
# DELETE /bookings/1.json
def destroy
#booking.destroy
respond_to do |format|
format.html { redirect_to bookings_url, notice: 'Booking was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_booking
#booking = Booking.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def booking_params
params.require(:booking).permit(:status, :title, :cost, :start, :cancellation_reason, :refunded, :practitioner_id, :schedule_id, :lesson_id, :account_id)
end
end
Log
Started POST "/bookings" for ::1 at 2020-03-23 12:42:06 +0100
Processing by BookingsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"IE78VI28UqOkuhXUnyY5bdvsN1S4wHw38Uu5BTZ+7ZdT0+6Ii50EThTELTiUWHuQOsOjy+MO4Dw6HyOwxJwWEw==", "booking"=>{"status"=>"Testing", "title"=>"Testing title", "cost"=>"3", "start(1i)"=>"2020", "start(2i)"=>"3", "start(3i)"=>"23", "start(4i)"=>"11", "start(5i)"=>"39", "cancellation_reason"=>"", "refunded"=>"0", "practitioner_id"=>"2", "schedule_id"=>"-1", "lesson_id"=>"2", "account_id"=>"1"}, "commit"=>"Create Booking"}
User Load (1.4ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 104 ORDER BY `users`.`id` ASC LIMIT 1
↳ /Users/kaspervalentin/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/activerecord-5.2.4.1/lib/active_record/log_subscriber.rb:98
(0.3ms) BEGIN
↳ app/controllers/bookings_controller.rb:30
Account Load (0.4ms) SELECT `accounts`.* FROM `accounts` WHERE `accounts`.`id` = 1 LIMIT 1
↳ app/controllers/bookings_controller.rb:30
Lesson Load (0.4ms) SELECT `lessons`.* FROM `lessons` WHERE `lessons`.`id` = 2 LIMIT 1
↳ app/controllers/bookings_controller.rb:30
(0.3ms) ROLLBACK
↳ app/controllers/bookings_controller.rb:30
Completed 500 Internal Server Error in 63ms (ActiveRecord: 2.8ms)
NoMethodError (undefined method `amoeba' for #<Class:0x00007fa37f7862a0>):
app/models/schedule.rb:15:in `<class:Schedule>'
app/models/schedule.rb:1:in `<main>'
app/controllers/bookings_controller.rb:30:in `block in create'
app/controllers/bookings_controller.rb:29:in `create'

Answer 1

First of all try to inherit your model class from ActiveRecord::Base also when you are using amoeba in model you can avoid enable method which you called in amoeba do block cause you don't need to write enable if you are using somth like include_association or exclude_association