Module: Sequel::Plugins::Tree::InstanceMethods

Defined in:
lib/sequel/plugins/tree.rb

Instance Method Summary collapse

Instance Method Details

#ancestors ⇒ Object

Returns list of ancestors, starting from parent until root.

subchild1.ancestors # => [child1, root]



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# File 'lib/sequel/plugins/tree.rb', line 81

def ancestors
  node, nodes = self, []
  nodes << node = node.parent while node.parent
  nodes
end

#descendants ⇒ Object

Returns list of ancestors, starting from parent until root.

subchild1.ancestors # => [child1, root]



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# File 'lib/sequel/plugins/tree.rb', line 90

def descendants
  nodes = children.dup
  nodes.each{|child| nodes.concat(child.descendants)}
  nodes 
end

#root ⇒ Object

Returns the root node of the tree that this node descends from. This node is returned if it is a root node itself.



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# File 'lib/sequel/plugins/tree.rb', line 98

def root
  ancestors.last || self
end

#root? ⇒ Boolean

Returns true if this is a root node, false otherwise.

Returns:

  • (Boolean) 


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# File 'lib/sequel/plugins/tree.rb', line 103

def root?
  !new? && self[model.parent_column].nil?
end

#self_and_siblings ⇒ Object

Returns all siblings and a reference to the current node.

subchild1.self_and_siblings # => [subchild1, subchild2]



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# File 'lib/sequel/plugins/tree.rb', line 110

def self_and_siblings
  parent ? parent.children : model.roots
end

#siblings ⇒ Object

Returns all siblings of the current node.

subchild1.siblings # => [subchild2]



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# File 'lib/sequel/plugins/tree.rb', line 117

def siblings
  self_and_siblings - [self]
end