How to use Calendar Google API in ruby on rails? - ruby-on-rails

Question

I try to use calendar api from google for flatsharing application in Ruby On Rails that we are making in bootcamp.
A can only access to my calendars, but I want to create a shared calendar for all roommates with the possibility adding events. I can really use some help.
I have this Rails error : Unexpected error: #<ArgumentError: Missing authorization code.>
pages controller
class PagesController < ApplicationController
skip_before_action :authenticate_user!
def home
end
def redirect
client = Signet::OAuth2::Client.new(client_options)
redirect_to client.authorization_uri.to_s, allow_other_host: true
end
def client_options
{
client_id: ENV["google_client_id"],
client_secret: ENV["google_client_secret"],
authorization_uri: 'https://accounts.google.com/o/oauth2/auth',
token_credential_uri: 'https://accounts.google.com/o/oauth2/token',
scope: Google::Apis::CalendarV3::AUTH_CALENDAR,
redirect_uri: callback_url
}
end
def callback
client = Signet::OAuth2::Client.new(client_options)
client.code = params[:code]
response = client.fetch_access_token!
session[:authorization] = response
redirect_to calendars_url
end
def calendars
client = Signet::OAuth2::Client.new(client_options)
client.update!(session[:authorization])
service = Google::Apis::CalendarV3::CalendarService.new
service.authorization = client
#calendar_list = service.list_calendar_lists
rescue Google::Apis::AuthorizationError
response = client.refresh!
session[:authorization] = session[:authorization].merge(response)
retry
end
def events
client = Signet::OAuth2::Client.new(client_options)
client.update!(session[:authorization])
service = Google::Apis::CalendarV3::CalendarService.new
service.authorization = client
#event_list = service.list_events(params[:calendar_id])
end
def new_event
client = Signet::OAuth2::Client.new(client_options)
client.update!(session[:authorization])
service = Google::Apis::CalendarV3::CalendarService.new
service.authorization = client
today = Date.today
event = Google::Apis::CalendarV3::Event.new({
start: Google::Apis::CalendarV3::EventDateTime.new(date: today),
end: Google::Apis::CalendarV3::EventDateTime.new(date: today + 1),
summary: 'New event!'
})
service.insert_event(params[:calendar_id], event)
redirect_to events_url(calendar_id: params[:calendar_id])
end
end
My routes
get '/redirect', to: 'pages#redirect', as: 'redirect'
get '/callback', to: 'pages#callback', as: 'callback'
get '/calendars', to: 'pages#calendars', as: 'calendars'
get '/events/:calendar_id', to: 'pages#events', as: 'events', calendar_id: /[^\/]+/
post '/events/:calendar_id', to: 'pages#new_event', as: 'new_event', calendar_id: /[^\/]+/
And my view
<div class="container">
<ul>
<% #calendar_list.items.each do |calendar| %>
<li><%= calendar.summary %> (<%= calendar.id %>)</li>
<% end %>
</ul>
<ul>
<% #event_list.items.each do |event| %>
<li><%= event.summary %> (<%= event.id %>)</li>
<% end %>
</ul>
<%= form_tag new_event_url do %>
<%= submit_tag 'Add event' %>
<% end %>
</div>
And I tried to follow this tutorial : https://readysteadycode.com/howto-integrate-google-calendar-with-rails