Module: MongoMapper::Plugins::ActsAsTree::ClassMethods

Defined in:
lib/mongo_mapper/plugins/acts_as_tree.rb

Overview

Instance Method Summary collapse

Instance Method Details

#acts_as_tree(options = {}) ⇒ Object 



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# File 'lib/mongo_mapper/plugins/acts_as_tree.rb', line 11

def acts_as_tree(options = {})
  configuration = { :foreign_key => :parent_id, :order => nil, :counter_cache => nil }
  configuration.update(options) if options.is_a?(Hash)

  # automatically create needed keys if they don't already exist
  key configuration[:foreign_key], ObjectId unless keys.key?(configuration[:foreign_key])
  key configuration[:foreign_key].to_s.pluralize.to_sym, Array unless keys.key?(configuration[:foreign_key].to_s.pluralize.to_sym)

  belongs_to :parent, :class_name => name, :foreign_key => configuration[:foreign_key], :counter_cache => configuration[:counter_cache]
  many :children, :class_name => name, :foreign_key => configuration[:foreign_key], :order => configuration[:order], :dependent => :destroy
  before_save :set_parents

  class_eval <<-EOV
    def self.roots
      where("#{configuration[:foreign_key]}".to_sym => nil).sort("#{configuration[:order]}").all
    end

    def self.root
      where("#{configuration[:foreign_key]}".to_sym => nil).sort("#{configuration[:order]}").first
    end

    def set_parents
      self.#{configuration[:foreign_key].to_s.pluralize} = parent.#{configuration[:foreign_key].to_s.pluralize}.dup << #{configuration[:foreign_key]} if parent?
    end
    
    def ancestors
      self.class.where(:id => { '$in' => self.#{configuration[:foreign_key].to_s.pluralize} }).all.reverse || []
    end
    
    def root
      self.class.find(self.#{configuration[:foreign_key].to_s.pluralize}.first) || self
    end
    
    def descendants
      self.class.where('#{configuration[:foreign_key].to_s.pluralize}' => self.id).all
    end
    
    def depth
      self.#{configuration[:foreign_key].to_s.pluralize}.count
    end
    
  EOV
end