我已经使用acts_as_list非常成功地实现了可排序对象。此外,我会将页面的元素抽象为一个单独的模型,这里称为PageElement
.
我认为没有必要切换到 NoSQL 数据库(尽管我不反对这种方法)。这是我在想什么的粗略草图:
class Page < ActiveRecord::Base
has_many :page_elements, :order => 'position'
has_many :todo_lists, :through => :page_elements, :source => :element, :source_type => 'TodoList'
has_many :notes, :through => :page_elements, :source => :element, :source_type => 'Note'
has_many :files, :through => :page_elements, :source => :element, :source_type => 'File'
has_many :discussions, :through => :page_elements, :source => :element, :source_type => 'Discussion'
end
class PageElement < ActiveRecord::Base
belongs_to :page
belongs_to :element, :polymorphic => true
acts_as_list :scope => :page
end
class TodoList < ActiveRecord::Base
has_one :page_element, :as => :element
has_one :page, :through => :page_elements
end
class Note < ActiveRecord::Base
has_one :page_element, :as => :element
has_one :page, :through => :page_elements
end
class File < ActiveRecord::Base
has_one :page_element, :as => :element
has_one :page, :through => :page_elements
end
class Discussion < ActiveRecord::Base
has_one :page_element, :as => :element
has_one :page, :through => :page_elements
end