I summarized the flow until implementing simple_calendar in Ruby on Rails.

I wanted to implement a reservation time setting function using a calendar in the original application and summarized the flow.

ruby '2.6.5' rails '6.0.0' simple_calendar "~> 2.0"

`As a prerequisite, different devises are created for user and doctor. `` Below is the related URL. Routing settings from file creation when creating multiple devises and creating separate login screens [I want to change the path after new registration after logging in with multiple devises. ] (https://qiita.com/kinpin/items/57b1657f9054189956c3)

** What you want to do ** Image from Gyazo

Create a function that can perform such a calendar function with user and doctor (each devise).

Create reservation, edit reservation time, delete → Function that doctor can do

Make a reservation → Function that user can do

① Write the following in the Gemfile and bundle install.

   gem "simple_calendar", "~> 2.0"

② Rails s will be restarted.

③ Create a model. Since this is a reservation function, we will create a reservation model.

  % rails g model reservation

④ Create a migration file.

   class CreateReservations < ActiveRecord::Migration[6.0]
  def change
    create_table :reservations do |t|
      t.references :doctor,   foreign_key:true 
      t.references :user,    foreign_key:true  
      t.datetime :start_time
      t.datetime :end_time

⑤ Create an association in the model file. I also write it in the user model doctor model (omitted)

   class Reservation < ApplicationRecord
     belongs_to :doctor
     belongs_to :user, optional: true
     validates :start_time, presence: true
     validates :end_time, presence: true

optional: true is described because it allows the foreign key nil. This is because there is no user_id when creating a new reservation. The reservation is created by the doctor, so there is always a doctor_id.

Run rails db; migrate.

   % rails db:migrate

⑥ Next, you need a controller, but there are some caveats.

The function that user can do is different from the function that doctor can do, and it is strange that user and doctor pass through the same controller due to security issues. So create controllers under different directories.

   % rails g controller doctors/reservations
   % rails g controller users/reservations

⑦ By doing this, you can separate the controller that the user passes through and the controller that the doctor passes through.



⑧ Set the routing. I want to use the namespace because I want to use the specified path for each devise.

   namespace :doctors do
      resources :reservations 
    namespace :users do
      resources :reservations 

If you do rails routes, you can see that each route has been created.

                            DELETE /users/:id(.:format)                                                                     users#destroy
                 doctors_reservations GET    /doctors/reservations(.:format)                                                          doctors/reservations#index
                                      POST   /doctors/reservations(.:format)                                                          doctors/reservations#create
              new_doctors_reservation GET    /doctors/reservations/new(.:format)                                                      doctors/reservations#new
             edit_doctors_reservation GET    /doctors/reservations/:id/edit(.:format)                                                 doctors/reservations#edit
                  doctors_reservation GET    /doctors/reservations/:id(.:format)                                                      doctors/reservations#show
                                      PATCH  /doctors/reservations/:id(.:format)                                                      doctors/reservations#update
                                      PUT    /doctors/reservations/:id(.:format)                                                      doctors/reservations#update
                                      DELETE /doctors/reservations/:id(.:format)                                                      doctors/reservations#destroy
                   users_reservations GET    /users/reservations(.:format)                                                            users/reservations#index
                                      POST   /users/reservations(.:format)                                                            users/reservations#create
                new_users_reservation GET    /users/reservations/new(.:format)                                                        users/reservations#new
               edit_users_reservation GET    /users/reservations/:id/edit(.:format)                                                   users/reservations#edit
                    users_reservation GET    /users/reservations/:id(.:format)                                                        users/reservations#show
                                      PATCH  /users/reservations/:id(.:format)                                                        users/reservations#update
                                      PUT    /users/reservations/:id(.:format)                                                        users/reservations#update
                                      DELETE /users/reservations/:id(.:format)                                                        users/reservations#destroy

⑨ Create the required view.

It is displayed on the doctor's show screen. The doctor creates a link that transitions to the new reservation screen, edit screen, and delete screen on the doctor show screen, and the user creates a link that transitions to the reservation screen on the doctor show screen.

First, insert the calendar.

   <%= month_calendar do |date| %>
     <%= date.day %>
   <% end %>

This completes the calendar template creation.

⑩ Define reservation creation, edit, and delete methods in the doctor controller, and make reservation decisions in the user controller.

`Here, which method is used to determine the reservation of user, but the conclusion is edit. `` Since the reservation table contains data at the time of the reservation list, adding user_id is considered to add one of the records.


 def new
    @reservation = Reservation.new

  def create
    @reservation = Reservation.new(reservation_params)
    if @reservation.save
      redirect_to doctor_path(current_doctor.id)
      render :new

  def edit
    @reservation = Reservation.find(params[:id])

  def update
    @reservation = Reservation.find(params[:id])
    if @reservation.update(reservation_params)
      redirect_to doctor_path(current_doctor.id)
      render :edit

  def destroy
    @reservation = Reservation.find(params[:id])
    if @reservation.destroy
      redirect_to doctor_path(current_doctor.id)
      render :show


  def reservation_params
    params.require(:reservation).permit(:start_time, :end_time).merge(doctor_id: current_doctor.id)


def edit
    @reservation = Reservation.find(params[:id])
    @doctor = Doctor.find(params[:id])

  def update
    @reservation = Reservation.find(params[:id])
    if @reservation.update(user_id: current_user.id)
      redirect_to doctor_path(@reservation.doctor_id)
      render :edit

The view display still needs to be fine-tuned, but this allows you to set a minimum calendar reservation feature. I will add it again. This is how we introduced simple_calendar. If you have any suggestions, please let us know! !!

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