module Sequel::Plugins::Tree::InstanceMethods
Public Instance Methods
ancestors()
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Returns list of ancestors, starting from parent until root.
subchild1.ancestors # => [child1, root]
# File lib/sequel/plugins/tree.rb 87 def ancestors 88 node, nodes = self, [] 89 meth = model.parent_association_name 90 while par = node.send(meth) 91 nodes << node = par 92 end 93 nodes 94 end
descendants()
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Returns list of descendants
node.descendants # => [child1, child2, subchild1_1, subchild1_2, subchild2_1, subchild2_2]
# File lib/sequel/plugins/tree.rb 99 def descendants 100 nodes = send(model.children_association_name).dup 101 send(model.children_association_name).each{|child| nodes.concat(child.descendants)} 102 nodes 103 end
root()
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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 107 def root 108 ancestors.last || self 109 end
root?()
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Returns true if this is a root node, false otherwise.
# File lib/sequel/plugins/tree.rb 112 def root? 113 !new? && possible_root? 114 end
self_and_siblings()
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Returns all siblings and a reference to the current node.
subchild1.self_and_siblings # => [subchild1, subchild2]
# File lib/sequel/plugins/tree.rb 119 def self_and_siblings 120 if parent = send(model.parent_association_name) 121 parent.send(model.children_association_name) 122 else 123 model.roots 124 end 125 end
siblings()
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Returns all siblings of the current node.
subchild1.siblings # => [subchild2]
# File lib/sequel/plugins/tree.rb 130 def siblings 131 self_and_siblings - [self] 132 end
Private Instance Methods
possible_root?()
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True if if all parent columns values are not NULL.
# File lib/sequel/plugins/tree.rb 137 def possible_root? 138 !Array(model.parent_column).map{|c| self[c]}.all? 139 end