With Google API Client, how to create client

https://gist.github.com/lightman76/2357338dcca65fd390e2 says client should be a Hurley client. It looks like you are passing an OAuth2::Client, which apparently doesn't respond to

get()

For client and auth, I would recommend trying a Hurley client and a Signet::OAuth2::Client auth.

You're getting that error because you're using passing the wrong objects to
ContactList::GoogleContactsApi.new(client, auth). That gist expects for client to be an instance of the dead Hurley HTTP client and auth to be an OAuth2 instance from Google's Signet library. Instead you're trying to Intridea's OAuth2 libary.

Since Hurley is a dead project, and that gist lacks any unit tests, I'd recommend you use a tested and working implementation such as the google_contacts_api gem which is compatible with Intridea's OAuth2 library:

require 'google_contacts_api'

auth = User.first.authentications.first
client = OAuth2::Client.new('x', 'x', :site => 'https://accounts.google.com')
oauth2_object = OAuth2::AccessToken.new(client, auth.token)
google_contacts_user = GoogleContactsApi::User.new(oauth2_object)

---

The issue of refreshing tokens really belongs in a separate question. In short, you'll have to make a request for a new token periodically using the refresh token Google provides:

data = {
  :client_id => GOOGLE_APP_KEY,
  :client_secret => GOOGLE_APP_SECRET,
  :refresh_token => oauth2_refresh_token_for_user,
  :grant_type => "refresh_token"
}
response = ActiveSupport::JSON.decode(RestClient.post("https://accounts.google.com/o/oauth2/token"), data)
if response["access_token"].present?
  puts response["access_token"]
else
  # No Token
end
rescue RestClient::BadRequest => e
  # Bad request
rescue
  # Something else bad happened
end

Note : As getting a contacts list usually requires a user's authentication to read private data, in the example below I assume that you've already implemented Oauth2 authentication with a sufficient scope and you got a valid ’token’ from that first step.

Lot of outdated/confusing documentation online because APIs' authentication and APIs themselves have been upgraded many times. To me most useful documentation is the one at http://www.rubydoc.info/github/google/google-api-ruby-client/

gem 'google-api-client' is still in alpha and moving quite fast, after lot of struggling I've been able to work with authenticated calls to Youtube, Gmail and Analytics APIS. I hope Contacts API work the same.

The Google API Ruby Client contains everything needed to manage API authentication and then request authorized subservices APIs. No need to struggle with Hurley, Signet or other HTTP/Rest clients.

#Gemfile
gem 'google-api-client'


#Class file
require 'google/api_client/client_secrets.rb' #Manage global google authentication
require 'google/apis/youtube_v3' #To be replaced with the proper Contact API

access = {...} #Credentials object returned by your Oauth strategy (gem 'omniauth-google-oauth2' works like a charm) 
secrets = Google::APIClient::ClientSecrets.new({
"web" => {"access_token" => access['token'], 
"refresh_token" => access['refresh_token'],
"client_id" => "xxxxxxxx.apps.googleusercontent.com", 
"client_secret" => "xxxxxxxxxxxx"}})

client = Google::Apis::YoutubeV3::YouTubeService.new #As per the require line, update it with you service API
client.authorization = secrets.to_authorization
client.authorization.refresh!

So far client variable is an authorized and ready to query object that I use like this for example in order to search for Youtube contents

client.list_searches('snippet', q: 'xxxxxx', type: 'channel'){ |res, err|