class KnowledgeBackup < ActiveRecord::Base

  has_many :knowledge_figure_backups, :dependent => :destroy

#  validates_length_of :title, :within => 0..400
  validates_length_of :textbody, :within => 0..100000
  
  #<< class methods >>

  class << self
    def new_comment_number_from_parent_document(parent_knowledge_id, user)
      comments = Knowledge.find(:all, :conditions => ["comment_on = ? AND comment_number IS NOT NULL", parent_knowledge_id], :user => user)
      if comments.length > 0
        comments.collect! {|comment|
          comment = comment.comment_number
        }
        comment_number = comments.max + 1
      else
        comment_number = 1
      end
    end

    # copy of ./node.rb
    def set_rgroups(*groups)
      groups = groups[0] if groups.length==1 and groups[0].is_a?(Array)
      self.rgroups = Group.bit_mask_for(*groups)
    end
  end
end