class method self.instantiate

# File activerecord/lib/active_record/base.rb, line 1654
        def instantiate(record)
          object =
            if subclass_name = record[inheritance_column]
              # No type given.
              if subclass_name.empty?
                allocate

              else
                # Ignore type if no column is present since it was probably
                # pulled in from a sloppy join.
                unless columns_hash.include?(inheritance_column)
                  allocate

                else
                  begin
                    compute_type(subclass_name).allocate
                  rescue NameError
                    raise SubclassNotFound,
                      "The single-table inheritance mechanism failed to locate the subclass: '#{record[inheritance_column]}'. " +
                      "This error is raised because the column '#{inheritance_column}' is reserved for storing the class in case of inheritance. " +
                      "Please rename this column if you didn't intend it to be used for storing the inheritance class " +
                      "or overwrite #{self.to_s}.inheritance_column to use another column for that information."
                  end
                end
              end
            else
              allocate
            end

          object.instance_variable_set("@attributes", record)
          object.instance_variable_set("@attributes_cache", Hash.new)

          if object.respond_to_without_attributes?(:after_find)
            object.send(:callback, :after_find)
          end

          if object.respond_to_without_attributes?(:after_initialize)
            object.send(:callback, :after_initialize)
          end

          object
        end