Module: MongoDoc::Timestamps

Defined in:
lib/mongo_doc/timestamps.rb

Instance Method Summary collapse

Instance Method Details

#timestamps! ⇒ Object

Create automatic timestamps on a root Document. Timestamps are not implemented for embedded documents.

Two timestamps fields are created: created_at, updated_at

created_at

set on initial save only

updated_at

set on every save



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# File 'lib/mongo_doc/timestamps.rb', line 11

def timestamps!
  [:created_at, :updated_at].each do |name|
    _add_key(name)
    attr_reader name
    class_eval(<<-RUBY, __FILE__, __LINE__)
      def #{name}=(value)                       # def created_at=(value)
        if value.kind_of?(String)               #   if value.kind_of?(String)
          value = Time.cast_from_string(value)  #     value = Time.cast_from_string(value)
        end                                     #   end
        @#{name} = value.nil? ? nil : value.utc #   @created_at = value.nil? ? nil : value.utc
      end                                       # end
    RUBY
  end

  class_eval(<<-RUBY, __FILE__, __LINE__)
    def _save(safe)
      if new_record?
        self.created_at = self.updated_at = Time.now
      else
        original_updated_at = updated_at
        self.updated_at = Time.now
      end
      super
    rescue Mongo::MongoDBError => e
      if new_record?
        self.created_at = self.updated_at = nil
      else
        self.updated_at = original_updated_at
      end
      raise e
    end

    def _update(selector, data, safe)
      original_updated_at = updated_at
      self.updated_at = Time.now
      data[:updated_at] = updated_at
      super
    rescue Mongo::MongoDBError => e
      self.updated_at = original_updated_at
      raise e
    end
  RUBY
end