Step 1: Set up Google Calendar API

Before we can start integrating the API, we need to set it up in the Google Developer Console. Follow these
steps:

1. Go to the Google Developer Console and create a new
   project.
2. Enable the Google Calendar API for your project.
3. Create credentials (API Key or OAuth 2.0 Client IDs) for accessing the API.

Step 2: Install necessary dependencies

In your Rails application, add the following dependencies to your Gemfile:

gem 'google-api-client', '~> 0.42'

gem 'google-auth-client', require: 'googleauth'



        

Then run bundle install to install the gems.

Step 3: Configure the API client

In your Rails application, create a new file named google_calendar_api.rb in the config/initializers
directory. Add the following code to configure the API client:

require 'google/apis/calendar_v3'



Google::Apis::RequestOptions.default.authorization = `googleauth.authorize(

  client_id: ENV['GOOGLE_CLIENT_ID'],

  client_secret: ENV['GOOGLE_CLIENT_SECRET'],

  redirect_uri: ENV['GOOGLE_REDIRECT_URI']

)`



        

Make sure to set the values of ENV['GOOGLE_CLIENT_ID'],
ENV['GOOGLE_CLIENT_SECRET'], and ENV['GOOGLE_REDIRECT_URI'] in your environment
variables.

Step 4: Use Google Calendar API in your Rails application

Now you can use the Google Calendar API in your Rails application. For example, to create a new event in a
user’s calendar, you can use the following code:

calendar_service = Google::Apis::CalendarV3::CalendarService.new

event = Google::Apis::CalendarV3::Event.new(

  summary: 'New Event',

  start: { date_time: DateTime.parse('2022-01-01T10:00:00+02:00') },

  end: { date_time: DateTime.parse('2022-01-01T12:00:00+02:00') }

)

calendar_service.insert_event('primary', event)



        

This code creates a new event with the summary “New Event” starting from 10 AM and ending at 12 PM on January 1,
2022.

Step 5: Explore more functionality

Google Calendar API offers various functionalities such as updating events, deleting events, retrieving events,
and more. Refer to the official
documentation for more details and explore the possibilities.