gistfile1.ru

ActiveRecord::Base.class_eval do
  
  # ActiveRecord looks up the columns for a table each time it loads a class using that table
  # With STI, this means repeated calls to 'SHOW FIELDS FROM table_name' for each subclass.
  def self.columns
    @@table_columns ||= {}
    unless @@table_columns[table_name]
      retrieved_columns = connection.columns(table_name, "#{name} Columns")
      retrieved_columns.each { |column| column.primary = column.name == primary_key }
      @@table_columns[table_name] = retrieved_columns
    end
    @@table_columns[table_name]
  end
  
  #original code we are overriding at the time that I wrote this:
  # def columns
  #   unless defined?(@columns) && @columns
  #     @columns = connection.columns(table_name, "#{name} Columns")
  #     @columns.each { |column| column.primary = column.name == primary_key }
  #   end
  #   @columns
  # end
  
end