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# File 'lib/treeoid.rb', line 2
def self.included(base)
base.class_eval do
field :ancestry, :type => Array
references_many :children, :class_name => base.name, :foreign_key => :parent_id
referenced_in :parent, :class_name => base.name
validate :hierarchical_integrity
before_save :set_ancestry!
after_save :set_child_ancestries!
scope :root, where(:parent_id => nil)
def has_children?
!children.empty?
end
def has_parent?
!parent.nil?
end
protected
def hierarchical_integrity
return unless parent_id
errors.add(:parent_id, "cannot be itself") if parent_id == self.id
unless self.class.where(:ancestry => id).id(parent_id).empty?
errors.add(:parent_id, "cannot be a current child")
end
end
def set_ancestry!
new_path = [(parent.try(:ancestry) || parent_id), id].compact.flatten
write_attribute :ancestry, new_path
end
def set_child_ancestries!
children.each(&:save)
end
end
base.instance_eval do
def hierarchically
criteria.asc :ancestry
end
end
end
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