Using Restforce Gem to connect Rails with Salesforce platform.

salesforce.rb

class Salesforce
  include Singleton

  def restforce
    @client ||= \
      Restforce.new :oauth_token => ENV['SALESFORCE_OAUTH'],
        :refresh_token => ENV['SALESFORCE_REFRESH_TOKEN'],
        :instance_url  => ENV['SALESFORCE_INSTANCE_URL'],
        :client_id     => ENV['SALESFORCE_CLIENT_ID'],
        :client_secret => ENV['SALESFORCE_SECRET']
  end
end

salesforce_contact.rb

class SalesforceContact
  def create(first_name, last_name, email)
    connect_to_salesforce.create(
      'Contact',
      FirstName: "#{first_name}",
      LastName: "#{last_name}",
      Email: "#{email}"
    )
  end

  def update(uid, email)
    connect_to_salesforce.upsert(
      'Contact',
      'ywam__Devise_UID__c',
      ywam__Devise_UID__c: "#{uid}",
      Email: "#{email}"
    )
  end
  
  private

  def connect_to_salesforce
    Salesforce.instance.restforce
  end
end