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This document discusses different ways that models can be structured and organized in Rails using acts_as_list, acts_as_tree, and acts_as_nested_set. Acts_as_list allows models to be organized and reordered as a simple list. Acts_as_tree allows models to be organized hierarchically with parent-child relationships like a tree. Acts_as_nested_set allows complex hierarchical relationships and includes additional methods for managing the tree structure.

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? acts as list ? acts as tree ? acts as nested set ? better nested set
acts as list ? Rails ?
? position integer ? model acts_as_list class CreateUsers < ActiveRecord::Migration class User < ActiveRecord::Base def self.up acts_as_list create_table :users do |t| validates_presence_of :name t.column :name, :string end t.column :position, :integer end end def self.down drop_table :users end end
? decrement_position ? ?rst? ? higher_item ? in_list? ? increment_position ? insert_at ? last? ? lower_item ? move_higher ? move_lower ? move_to_bottom ? move_to_top ? remove_from_list
position ? acts_as_list :scope=>XXX class CreateMobileSuits < class MobileSuit < ActiveRecord::Base ActiveRecord::Migration belongs_to :group def self.up acts_as_list :scope => :group create_table :mobile_suits do |t| end t.column :group_id,:integer t.column :position,:integer t.column :name, :string end end def self.down drop_table :mobile_suits end end
? XXcrement_position ? ? remove_from_list ? position nil
acts as tree ? Rails ?
? parent_id integer ? model acts_as_tree class CreateDepartments < ActiveRecord::Migration class Department < ActiveRecord::Base def self.up acts_as_tree :order => :id create_table :departments do |t| end t.column :name, :string t.column :parent_id, :integer end end def self.down drop_table :departments end end
? ancestors ? root ? self_and_siblings siblings+ ? siblings belongs_to parent has_many children has_many belongs_to department=Department.?nd(5) department.children.create(:name=>¡± ¡±) department.root.name #
acts as tree ? ? ? ?
acts as nested set ? Rails ? ? acts as tree
acts as nested set root |_ Child 1 |_ Child 1.1 |_ Child 1.2 |_ Child 2 |_ Child 2.1 |_ Child 2.2 leaf select
? parent_id,lft,rgt integer ? model acts_as_nested_set class CreateOrganizations < ActiveRecord::Migration class Organization < ActiveRecord::Base def self.up acts_as_nested_set create_table :organizations do |t| end t.column :name, :string t.column :parent_id, :integer t.column :lft, :integer t.column :rgt, :integer end end def self.down drop_table :organizations end end
? add_child(child) ? all_children ? before_destroy ? child? ? children_count ? direct_children ? full_set ? root? ? unknown?
acts as nested set ? ? before_destroy add_child ? ?
better nested set ? http://d.hatena.ne.jp/xibbar/20060922#1159014466 ? move_to_child_of ? move_to_right_of ? move_to_left_of ? root ? roots ? level ? ancestors ? self_and_ancestors ? siblings ? self_and_siblings ? children_count ? children ? all_children ? left_col_name ? right_col_name ? parent_col_name
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  • 2. ? acts as list ? acts as tree ? acts as nested set ? better nested set
  • 3. acts as list ? Rails ?
  • 4. ? position integer ? model acts_as_list class CreateUsers < ActiveRecord::Migration class User < ActiveRecord::Base def self.up acts_as_list create_table :users do |t| validates_presence_of :name t.column :name, :string end t.column :position, :integer end end def self.down drop_table :users end end
  • 5. ? decrement_position ? ?rst? ? higher_item ? in_list? ? increment_position ? insert_at ? last? ? lower_item ? move_higher ? move_lower ? move_to_bottom ? move_to_top ? remove_from_list
  • 6. position ? acts_as_list :scope=>XXX class CreateMobileSuits < class MobileSuit < ActiveRecord::Base ActiveRecord::Migration belongs_to :group def self.up acts_as_list :scope => :group create_table :mobile_suits do |t| end t.column :group_id,:integer t.column :position,:integer t.column :name, :string end end def self.down drop_table :mobile_suits end end
  • 7. ? XXcrement_position ? ? remove_from_list ? position nil
  • 8. acts as tree ? Rails ?
  • 9. ? parent_id integer ? model acts_as_tree class CreateDepartments < ActiveRecord::Migration class Department < ActiveRecord::Base def self.up acts_as_tree :order => :id create_table :departments do |t| end t.column :name, :string t.column :parent_id, :integer end end def self.down drop_table :departments end end
  • 10. ? ancestors ? root ? self_and_siblings siblings+ ? siblings belongs_to parent has_many children has_many belongs_to department=Department.?nd(5) department.children.create(:name=>¡± ¡±) department.root.name #
  • 12. acts as nested set ? Rails ? ? acts as tree
  • 13. acts as nested set root |_ Child 1 |_ Child 1.1 |_ Child 1.2 |_ Child 2 |_ Child 2.1 |_ Child 2.2 leaf select
  • 14. ? parent_id,lft,rgt integer ? model acts_as_nested_set class CreateOrganizations < ActiveRecord::Migration class Organization < ActiveRecord::Base def self.up acts_as_nested_set create_table :organizations do |t| end t.column :name, :string t.column :parent_id, :integer t.column :lft, :integer t.column :rgt, :integer end end def self.down drop_table :organizations end end
  • 15. ? add_child(child) ? all_children ? before_destroy ? child? ? children_count ? direct_children ? full_set ? root? ? unknown?
  • 16. acts as nested set ? ? before_destroy add_child ? ?
  • 17. better nested set ? http://d.hatena.ne.jp/xibbar/20060922#1159014466 ? move_to_child_of ? move_to_right_of ? move_to_left_of ? root ? roots ? level ? ancestors ? self_and_ancestors ? siblings ? self_and_siblings ? children_count ? children ? all_children ? left_col_name ? right_col_name ? parent_col_name
  • 18. ? ?