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 }
  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]
  many :children, :class_name => name, :foreign_key => configuration[:foreign_key], :order => configuration[:order], :dependent => :destroy

  before_save :set_parents

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