Rails勉強会＠東北の資料です

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
• first?
• 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.find(5)
department.children.create(:name=>” ”)
department.root.name #

11. acts as tree
•
•
•
•

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. •
•