Module: Applicat::Mvc::Model::Tree

Included in:
Area
Defined in:
lib/applicat/mvc/model/tree.rb

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/applicat/mvc/model/tree.rb', line 5

def self.included(base)
  base.class_eval do
    has_ancestry :cache_depth => true, :orphan_strategy => :rootify

    acts_as_list

    default_scope -> { order('position') }
    
    def add_child(element,position=nil)
      #need to add errors to @element.errors and return something
      temp = element.children
      element.ancestry = self.child_ancestry
      element.position = position || siblings.to_i + 1
      element.save
      return element.update_children(temp)
    end
    
    # Accepts the typical array of ids from a scriptaculous sortable. It is called on the instance being moved
    def sort(array_of_ids)
      if array_of_ids.first == id.to_s
        move_to_left_of siblings.find(array_of_ids.second)
      else
        move_to_right_of siblings.find(array_of_ids[array_of_ids.index(id.to_s) - 1])
      end
    end
    
    def move_to_child_of(reference_instance)
      transaction do
        remove_from_list
        self.update_attributes!(:parent => reference_instance)
        add_to_list_bottom
        save!
      end
    end
    
    def move_to_left_of(reference_instance)
      transaction do
        remove_from_list
        reference_instance.reload # Things have possibly changed in this list
        self.update_attributes!(:parent_id => reference_instance.parent_id)
        reference_item_position = reference_instance.position
        increment_positions_on_lower_items(reference_item_position)
        self.update_attribute(:position, reference_item_position)
      end
    end
    
    def move_to_right_of(reference_instance)
      transaction do
        remove_from_list
        reference_instance.reload # Things have possibly changed in this list
        self.update_attributes!(:parent_id => reference_instance.parent_id)
        if reference_instance.lower_item
          lower_item_position = reference_instance.lower_item.position
          increment_positions_on_lower_items(lower_item_position)
          self.update_attribute(:position, lower_item_position)
        else
          add_to_list_bottom
          save!
        end
      end   
    end
    
    protected
    
    def update_children(children)
      children.each do |child|
        temp = child.children
        child.ancestry = self.child_ancestry
        child.save!
        return child.update_children(temp)
      end
    end
  end
end