Returns list of ancestors, starting from parent until root.
subchild1.ancestors # => [child1, root]
# File lib/sequel/plugins/tree.rb, line 86 def ancestors node, nodes = self, [] nodes << node = node.parent while node.parent nodes end
Returns list of ancestors, starting from parent until root.
subchild1.ancestors # => [child1, root]
# File lib/sequel/plugins/tree.rb, line 95 def descendants nodes = children.dup nodes.each{|child| nodes.concat(child.descendants)} nodes end
Returns the root node of the tree that this node descends from This node is returned if it is a root node itself.
# File lib/sequel/plugins/tree.rb, line 103 def root ancestors.last || self end
Returns true if this is a root node, false otherwise.
# File lib/sequel/plugins/tree.rb, line 108 def root? !new? && self[model.parent_column].nil? end
Returns all siblings and a reference to the current node.
subchild1.self_and_siblings # => [subchild1, subchild2]
# File lib/sequel/plugins/tree.rb, line 115 def self_and_siblings parent ? parent.children : model.roots end
Returns all siblings of the current node.
subchild1.siblings # => [subchild2]
# File lib/sequel/plugins/tree.rb, line 122 def siblings self_and_siblings - [self] end