diff options
Diffstat (limited to 'activerecord/lib')
| -rw-r--r-- | activerecord/lib/active_record/attributes.rb | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/attributes.rb b/activerecord/lib/active_record/attributes.rb index c89099589e..8b2c4c7170 100644 --- a/activerecord/lib/active_record/attributes.rb +++ b/activerecord/lib/active_record/attributes.rb @@ -82,6 +82,14 @@ module ActiveRecord # # StoreListing.new.my_string # => "new default" # + # class Product < ActiveRecord::Base + # attribute :my_default_proc, :datetime, default: -> { Time.now } + # end + # + # Product.new.my_default_proc # => 2015-05-30 11:04:48 -0600 + # sleep 1 + # Product.new.my_default_proc # => 2015-05-30 11:04:49 -0600 + # # Attributes do not need to be backed by a database column. # # class MyModel < ActiveRecord::Base @@ -204,7 +212,8 @@ module ActiveRecord # # +default+ The default value to use when no value is provided. If this option # is not passed, the previous default value (if any) will be used. - # Otherwise, the default will be +nil+. + # Otherwise, the default will be +nil+. A proc can also be passed, and + # will be called once each time a new value is needed. # # +user_provided_default+ Whether the default value should be cast using # +cast+ or +deserialize+. |