diff options
Diffstat (limited to 'activerecord/lib/active_record/nested_attributes.rb')
| -rw-r--r-- | activerecord/lib/active_record/nested_attributes.rb | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb index 520969adbb..33611b410c 100644 --- a/activerecord/lib/active_record/nested_attributes.rb +++ b/activerecord/lib/active_record/nested_attributes.rb @@ -190,6 +190,34 @@ module ActiveRecord # destruction, are saved and destroyed automatically and atomically when # the parent model is saved. This happens inside the transaction initiated # by the parents save method. See ActiveRecord::AutosaveAssociation. + # + # === Using with attr_accessible + # + # The use of <tt>attr_accessible</tt> can interfere with nested attributes + # if you're not careful. For example, if the <tt>Member</tt> model above + # was using <tt>attr_accessible</tt> like this: + # + # attr_accessible :name + # + # You would need to modify it to look like this: + # + # attr_accessible :name, :posts_attributes + # + # === Validating the presence of a parent model + # + # If you want to validate that a child record is associated with a parent + # record, you can use <tt>validates_presence_of</tt> and + # <tt>inverse_of</tt> as this example illustrates: + # + # class Member < ActiveRecord::Base + # has_many :posts, :inverse_of => :member + # accepts_nested_attributes_for :posts + # end + # + # class Post < ActiveRecord::Base + # belongs_to :member, :inverse_of => :posts + # validates_presence_of :member + # end module ClassMethods REJECT_ALL_BLANK_PROC = proc { |attributes| attributes.all? { |_, value| value.blank? } } |