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class Buyer < User
end

class Seller < User
end

class Order
  belongs_to :buyer
  belongs_to :seller
end

class Order
  belongs_to :buyer, foreign_key: :buyer_id, class_name: User
  belongs_to :seller, foreign_key: :seller_id, class_name: User
end

def respond_with_400(exception)
    render json: { success: false, all_errors: ['The user has not authorized application'] }, status: 400
  end

  def respond_with_404(exception=nil)
    render json: { success: false, all_errors: [t('errors.not_found')] }, status: 404
  end

  def respond_with_500(exception)
    render json: {success: false, all_errors: [t('errors.something_went_wrong')], debug: exception.to_s}, status: 500
  end

  def respond_with_success(resource=nil, status=200)
    result = {success: true}
    result.merge!(:"#{resource.class.name.underscore}" => {id: resource.id}) if resource.present?

    render json: result, status: status
  end

  def respond_with_errors(resource=nil, status=422, debug=nil)
    result = {success: false}

    result.merge!(errors: resource.errors.messages, all_errors: resource.errors.full_messages)  if resource.present?
    result.merge!(debug: debug) if debug.present?

    render json: result, status: status
  end

@tmp = 'Some value'
email_body = ERB.new(mail_template_from_database).result(binding)

mail(to: user_email,  body: email_body,   content_type: "text/html",   subject: "Email subject")

unless Rails.application.config.consider_all_requests_local
    rescue_from Exception, with: :respond_with_500

    rescue_from ActiveRecord::RecordNotFound,
                ActionController::RoutingError,
                ActiveRecord::RecordInvalid,
                with: :respond_with_404

    rescue_from ActionController::BadRequest, with: :respond_with_400
  end

def respond_with_404(exception=nil)
    redirect_to root_path
  end

SomeApp.SocialLoginButtonView = Ember.View.extend(
  tagName: "a"
  attributeBindings: ['href']

  click: (e)->
    e.preventDefault()
    provider  = $(e.currentTarget).attr('href')

    url = "/users/auth/#{provider}?transition_to_root=true"
    window.open(
      url, '_blank',
      'width=600,height=500,location=yes,resizable=yes,scrollbars=yes'
    )
)

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController

  layout 'blank'

  def facebook
    sign_in_with_oauth_data(request.env['omniauth.auth'])
  end

  def twitter
    sign_in_with_oauth_data(request.env['omniauth.auth'])
  end

  private

  def sign_in_with_oauth_data(oauth_data)
    unless user_signed_in?
      user =  User.find_or_create_with_oauth(oauth_data)
      sign_in :user, user
      MailWorker.perform_in(1.hour, user.id, :account_dropoff)
    end

    @success = current_user.register_social_profile(normalize_oauth_data(oauth_data))
    @service_name = oauth_data.provider

    render 'shared/social_authentication'
  end

  def normalize_oauth_data(oauth_data)
    { service_name: oauth_data.provider, uid: oauth_data.uid, access_token: oauth_data.credentials.token, secret_key: oauth_data.credentials.secret }
  end
end

<script type="text/javascript" charset="UTF-8">
  <% if @success %>
      window.opener.SomeApp.sendSuccess()
  <% else %>
    window.opener.SomeApp.sendFailure()
  <% end %>

  window.close();
</script>