instance method `touch`

Ruby on Rails 5.2.8.1

Since v3.0.20

Available in: v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

touch(*names, time: nil)

Saves the record with the updated_at/on attributes set to the current time or the time specified. Please note that no validation is performed and only the after_touch, after_commit and after_rollback callbacks are executed.

This method can be passed attribute names and an optional time argument. If attribute names are passed, they are updated along with updated_at/on attributes. If no time argument is passed, the current time is used as default.

product.touch                         # updates updated_at/on with current time
product.touch(time: Time.new(2015, 2, 16, 0, 0, 0)) # updates updated_at/on with specified time
product.touch(:designed_at)           # updates the designed_at attribute and updated_at/on
product.touch(:started_at, :ended_at) # updates started_at, ended_at and updated_at/on attributes

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

Note that touch must be used on a persisted object, or else an ActiveRecordError will be thrown. For example:

ball = Ball.new
ball.touch(:updated_at)   # => raises ActiveRecordError

Parameters

names rest
time key = nil

Source

# File activerecord/lib/active_record/persistence.rb, line 651
    def touch(*names, time: nil)
      unless persisted?
        raise ActiveRecordError, <<-MSG.squish
          cannot touch on a new or destroyed record object. Consider using
          persisted?, new_record?, or destroyed? before touching
        MSG
      end

      attribute_names = timestamp_attributes_for_update_in_model
      attribute_names |= names.map(&:to_s)

      unless attribute_names.empty?
        affected_rows = _touch_row(attribute_names, time)
        @_trigger_update_callback = affected_rows == 1
      else
        true
      end
    end

Defined in activerecord/lib/active_record/persistence.rb line 651 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::Persistence

Signature

Parameters