class Tag
  
  @@original_find = self.method(:find) 
  # Rename the find method to find_with_pendings that includes all tags in the search regardless if its pending or not 
  def self.find_with_pendings(*args)
      @@original_find.call(*args)
  end
  
  # Redefine the find method to exclude the pending tags from the search not allowing to tag something with an unapproved tag
  def self.find(*args)
    self.with_scope(:find => { :conditions => ['pending = ?', false] }) do
      self.find_with_pendings(*args)
    end
  end

  # Return all the tags that were suggested but not yet approved
  def self.find_pendings
    self.find_with_pendings(:all, :conditions => ['pending = ?', true])
  end

  # All the tags that can be a new parent for this tag, that is all but itself and its descendents to avoid loops
  def parent_candidates
    Tag.find(:all) - descendents - [self]
  end
  
  # All tags that have this tag as its one of its ancestors
  def descendents
    children.to_a.sum([], &:descendents) + children 
  end

end