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-rw-r--r--activerecord/lib/active_record/nested_attributes.rb12
1 files changed, 12 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb
index 435c81c153..fa20bce3a9 100644
--- a/activerecord/lib/active_record/nested_attributes.rb
+++ b/activerecord/lib/active_record/nested_attributes.rb
@@ -63,6 +63,18 @@ module ActiveRecord
# member.update params[:member]
# member.avatar.icon # => 'sad'
#
+ # If you want to update the current avatar without providing the id, you must add <tt>:update_only</tt> option.
+ #
+ # class Member < ActiveRecord::Base
+ # has_one :avatar
+ # accepts_nested_attributes_for :avatar, update_only: true
+ # end
+ #
+ # params = { member: { avatar_attributes: { icon: 'sad' } } }
+ # member.update params[:member]
+ # member.avatar.id # => 2
+ # member.avatar.icon # => 'sad'
+ #
# By default you will only be able to set and update attributes on the
# associated model. If you want to destroy the associated model through the
# attributes hash, you have to enable it first using the