You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: face.rb
    path of file: ./repos/gallerist/lib/gallerist/models/photos_extensions
    
    the code of the file until where you have to start completion: # This code is 
    
  def __extend
    self.table_name = 'RKFace'

    has_one :person, primary_key: 'personId', foreign_key: 'modelId'
    has_one :photo, primary_key: 'imageModelId', foreign_key: 'modelId'

    alias_attribute :center_x, :centerX
    alias_attribute :center_y, :centerY
    alias_attribute :source_height, :sourceHeight
    alias_attribute :source_width, :sourceWidth
  end