diff options
author | David Heinemeier Hansson <david@loudthinking.com> | 2004-12-16 16:23:59 +0000 |
---|---|---|
committer | David Heinemeier Hansson <david@loudthinking.com> | 2004-12-16 16:23:59 +0000 |
commit | 6860db61f516b813af624d38b47fef0bf983539c (patch) | |
tree | af6fa07944f5af223b96351a629fc38323870137 /activerecord/lib/active_record/acts/tree.rb | |
parent | 12f10f6baf7e38c74db24585d901063cd094867b (diff) | |
download | rails-6860db61f516b813af624d38b47fef0bf983539c.tar.gz rails-6860db61f516b813af624d38b47fef0bf983539c.tar.bz2 rails-6860db61f516b813af624d38b47fef0bf983539c.zip |
Renamed Mixins to Acts to resemble the change from include ActiveRecord::Mixins::List to acts_as_list and renamed @@default_error_messagess to @@default_error_messages
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@190 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
Diffstat (limited to 'activerecord/lib/active_record/acts/tree.rb')
-rw-r--r-- | activerecord/lib/active_record/acts/tree.rb | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/acts/tree.rb b/activerecord/lib/active_record/acts/tree.rb new file mode 100644 index 0000000000..f05bbe9a78 --- /dev/null +++ b/activerecord/lib/active_record/acts/tree.rb @@ -0,0 +1,40 @@ +module ActiveRecord + module Acts + # Including this mixin if you want to model a tree structure by providing a parent association and an children + # association. This mixin assumes that you have a column called parent_id + # + # class Category < ActiveRecord::Base + # include ActiveRecord::Mixins::Tree + # end + # + # Example : + # root + # \_ child1 + # \_ sub-child1 + # + # root = Category.create("name" => "root") + # child1 = root.children.create("name" => "child1") + # subchild1 = child1.children.create("name" => "subchild1") + # + # root.parent # => nil + # child1.parent # => root + # root.children # => [child1] + # root.children.first.children.first # => subchild1 + module Tree + def self.append_features(base) + super + base.extend(ClassMethods) + end + end + + module ClassMethods + def acts_as_tree(options = {}) + configuration = { :foreign_key => "parent_id", :order => nil } + configuration.update(options) if options.is_a?(Hash) + + belongs_to :parent, :class_name => name, :foreign_key => configuration[:foreign_key] + has_many :children, :class_name => name, :foreign_key => configuration[:foreign_key], :order => configuration[:order], :dependent => true + end + end + end +end
\ No newline at end of file |