序列化属性没有作为正确的对象返回

Question

我的模型serialize :vertices, Array 中有一个序列化属性。使用它时似乎一切正常，但是在我重新加载控制台（或在 Web 请求中）之后，序列化数组作为字符串返回，这显然不是我所期望的。这是 rails 控制台中的相同过程：

ruby-1.9.2-p290 :009 > g.vertices = [Vertex.new, Vertex.new]
 => [#<Vertex:0x000000036315e8 @neighbours={}, @options={}, @name=nil, @real_name=nil, @teacher=nil, @discipline=nil, @student_group=nil>, #<Vertex:0x00000003631458 @neighbours={}, @options={}, @name=nil, @real_name=nil, @teacher=nil, @discipline=nil, @student_group=nil>] 
ruby-1.9.2-p290 :010 > g.inspect
 => "#<Graph id: 17, vertices: [#<Vertex:0x000000036315e8 @neighbours={}, @options={}, @name=nil, @real_name=nil, @teacher=nil, @discipline=nil, @student_group=nil>, #<Vertex:0x00000003631458 @neighbours={}, @options={}, @name=nil, @real_name=nil, @teacher=nil, @discipline=nil, @student_group=nil>], oriented: true, max_index: 0, trigger_limit: nil, created_at: \"2011-11-01 09:13:40\", updated_at: \"2011-11-01 09:17:30\", name: nil>" 
ruby-1.9.2-p290 :011 > g.save
   (0.4ms)  UPDATE "graphs" SET "vertices" = '---
- !ruby/object:Vertex
 neighbours: {}
 options: {}
 name: !!null 
 real_name: !!null 
 teacher: !!null 
 discipline: !!null 
 student_group: !!null 
- !ruby/object:Vertex
 neighbours: {}
 options: {}
 name: !!null 
 real_name: !!null 
 teacher: !!null 
 discipline: !!null 
 student_group: !!null 
', "updated_at" = '2011-11-01 09:21:11.516199' WHERE "graphs"."id" = 17
 => true 
ruby-1.9.2-p290 :012 > g.inspect
 => "#<Graph id: 17, vertices: [#<Vertex:0x000000036315e8 @neighbours={}, @options={}, @name=nil, @real_name=nil, @teacher=nil, @discipline=nil, @student_group=nil>, #<Vertex:0x00000003631458 @neighbours={}, @options={}, @name=nil, @real_name=nil, @teacher=nil, @discipline=nil, @student_group=nil>], oriented: true, max_index: 0, trigger_limit: nil, created_at: \"2011-11-01 09:13:40\", updated_at: \"2011-11-01 09:21:11\", name: nil>" 
ruby-1.9.2-p290 :013 > reload!
Reloading...
 => true 
ruby-1.9.2-p290 :014 > g = Graph.last
  Graph Load (0.1ms)  SELECT "graphs".* FROM "graphs" ORDER BY "graphs"."id" DESC LIMIT 1
 => #<Graph id: 17, vertices: "---\n- !ruby/object:Vertex\n  neighbours: {}\n  option...", oriented: true, max_index: 0, trigger_limit: nil, created_at: "2011-11-01 09:13:40", updated_at: "2011-11-01 09:21:11", name: nil> 
ruby-1.9.2-p290 :015 > g.vertices.class
 => String 
ruby-1.9.2-p290 :016 > 

我猜它没有正确反序列化（可能是因为我在数组中的自定义类？）任何提示将不胜感激。谢谢。

Answer 1

保存序列化的 Ruby 实例并不十分优雅。我建议使用更正统的方法，例如使用composed_of，或任何其他实际保存参数以将实例构建到数据库而不是实例本身的解决方案：

http://api.rubyonrails.org/classes/ActiveRecord/Aggregations/ClassMethods.html