method

touch

v3.0.0 - Show latest stable - 0 notes - Class: ActiveRecord::Persistence

touch(name = nil) public

Saves the record with the updated_at/on attributes set to the current time. Please note that no validation is performed and no callbacks are executed. If an attribute name is passed, that attribute is updated along with updated_at/on attributes.

  product.touch               # updates updated_at/on
  product.touch(:designed_at) # updates the designed_at attribute and updated_at/on

If used along with belongs_to then touch will invoke touch method on associated object.

  class Brake < ActiveRecord::Base
    belongs_to :car, :touch => true
  end

  class Car < ActiveRecord::Base
    belongs_to :corporation, :touch => true
  end

  # triggers @brake.car.touch and @brake.car.corporation.touch
  @brake.touch

Show source

# File activerecord/lib/active_record/persistence.rb, line 226
    def touch(name = nil)
      attributes = timestamp_attributes_for_update_in_model
      unless attributes.blank?
        attributes << name if name

        current_time = current_time_from_proper_timezone
        changes = {}

        attributes.each do |column|
          changes[column.to_s] = write_attribute(column.to_s, current_time)
        end

        @changed_attributes.except!(*changes.keys)
        primary_key = self.class.primary_key
        self.class.update_all(changes, { primary_key => self[primary_key] }) == 1
      end
    end

touch

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