pageviews.rb

class Pageviews < ActiveRecord::Base
  #google analytics api shenanigans
  require 'google/api_client'
  require 'date'
  include ReportingHelper

  def self.getviews post
    client, analytics, parameters = ReportingHelper.initclient

    parameters = {
      'ids'         => PROFILE,
      'start-date'  => (Date.today - 30).strftime("%Y-%m-%d"),
      'end-date'    => Date.today.strftime("%Y-%m-%d"),
      'metrics'     => "ga:pageviews",
      'dimensions'  => "ga:date",
      'filters'     => "ga:pagePath=~/#{post}"
    }

 
    cache_key = post #just for debugging. This is unique for each post.
    # Rails.cache.fetch('google_analytics_api/#{cache_key}', expires_in: 2.minutes) do
    #   result = client.execute(:api_method => analytics.data.ga.get, :parameters => parameters)
    #   result.data.rows.map{|hit| hit[1].to_i}.join(', ')

    # end

  end

end

reporting_helper.rb

require 'google/api_client'
require 'date'

module ReportingHelper

  SERVICE_ACCOUNT_EMAIL = 'email'
  KEY_PATH = File.join(Rails.root, '/config/', 'key.p12')
  PROFILE = 'ga:123456789'

  def self.initclient
    client = Google::APIClient.new(:application_name => 'domain.com', :application_version => '1')

    key = Google::APIClient::PKCS12.load_key(KEY_PATH, 'notasecret')
    service_account = Google::APIClient::JWTAsserter.new(
      SERVICE_ACCOUNT_EMAIL,
      ['https://www.googleapis.com/auth/analytics.readonly', 'https://www.googleapis.com/auth/prediction'],
    key)
    client.authorization = service_account.authorize
    analytics = client.discovered_api('analytics', 'v3')

    parameters = {
      'accountId' => '~all',
      'webPropertyId' => '~all'
    }

    return client, analytics, parameters
  end

end

view.haml

%div.left-meta
  =Pageviews.getviews(@post.friendly_id)