Ruby on Rails的3 - 序列化阵列不匹配类的困惑 [英] Ruby on Rails 3 - Serialize Array Mismatched Class Bafflement

问题描述

嘿， 我对这个序列不匹配的问题，Rails的3.0.5和Ruby 1.9.2百思不得其解。我播种与阵列的一个子类的数据库，然后试图保存到一个ActiveRecord对象。谁能帮帮我吗？我最初是想序列化为图形，但它降低到阵列，以避免错误与自定义类。我很为难，因为这没有任何直观的感觉来了我。非常感谢您的帮助！

 类图＆LT;排列
  ..

一流的设置和LT;的ActiveRecord :: Base的
  连载：图表，阵列
  ..
 

在seeds.rb

非常最后几行 - 如没有之后发生的。只是节省了大量用于调试的目的：

  sh_1g = sh_1g.to_a
  d.company.settings.add_graph（sh_1g.to_a）
  d.company.settings.save！
  d.company.save！
  d.save！
  如果sh_1g == d.company.settings.graphs [0]
    把所添加的图形的第一图表中的图表阵列匹配
  结束
  提出增加了+ sh_1g.inspect +到+ d.company.settings.graphs.inspect
  把类保存添加图形是+ d.company.settings.graphs [0] .class.inspect
  把类加图的是+ sh_1g.class.inspect
  把类图序列的是+ d.company.settings.graphs.class.inspect
 

seeds.rb输出所说，因为它是运行：

 在图形数组中的第一个图形中添加图形匹配
加入[[[0,0，..]]]向[[[[0，0，..]]] ..
班加图作为保存IsArray的
班加图的是数组
类图系列是数组
 

不过，在控制台：

 红宝石-1.9.2-P180：002＆GT; Company.all [1] .settings
ActiveRecord的:: SerializationTypeMismatch：图应该是一个数组，而是一个字符串
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/attribute_methods/read.rb:106:in `unserialize_attribute
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/attribute_methods/read.rb:82:in `read_attribute
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/base.rb:1586:in`attribute_for_inspect
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/base.rb:1667:in`块检查
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/base.rb:1665:in'收集'
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/base.rb:1665:in'检查'
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/associations/association_proxy.rb:146:in '检查'
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.5/lib/rails/commands/console.rb:44:in'开始'
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.5/lib/rails/commands/console.rb:8:in'开始'
    从/Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.5/lib/rails/commands.rb:23:in`＆LT;顶（必填）＆GT;
    从脚本/导轨：6：在'要求'
    从脚本/导轨：6：`＆lt;主＆GT;
 

解决方案

我有一个与此相似的问题。 some_column，阵列语句：从我的位置连载了我的问题源于。如果由于某种在你的ActiveRecord对象类属性的方法获得定义在打电话之前连载，你不会有正确定义的setter和getter方法​​。

所以，我会确保该 define_attribute_methods 不会被调用您的设置类，你声明的列进行序列化之前。

Hey there, I am baffled by this serialization mismatch problem in Rails 3.0.5 and Ruby 1.9.2. I am seeding the database with a subclass of Array and then trying to save to an ActiveRecord object. Can anyone please help me? I was initially trying to serialize as Graph but reduced it to Array to avoid bugs with the custom class. I am very stumped as this doesn't make intuitive sense to me. Thank you very much for your help!

class Graph < Array
  ..

class Settings < ActiveRecord::Base
  serialize :graphs, Array
  ..

Very last lines in seeds.rb -- eg nothing happens after. Just saving a lot for debugging purposes:

  sh_1g = sh_1g.to_a
  d.company.settings.add_graph(sh_1g.to_a)
  d.company.settings.save!
  d.company.save!  
  d.save!
  if sh_1g == d.company.settings.graphs[0]
    puts "the added graph matches the first graph in the graphs array"
  end
  puts "added " + sh_1g.inspect + " to " + d.company.settings.graphs.inspect
  puts "class of added graph as saved is" + d.company.settings.graphs[0].class.inspect
  puts "class of added graph is " + sh_1g.class.inspect
  puts "class of graphs serial is " + d.company.settings.graphs.class.inspect

Output of seeds.rb puts as it is run:

the added graph matches the first graph in the graphs array
added [[[0, 0, ..]]] to to [[[[0, 0, ..]]]..]
class of added graph as saved isArray
class of added graph is Array
class of graphs serial is Array

However, in console:

ruby-1.9.2-p180 :002 > Company.all[1].settings
ActiveRecord::SerializationTypeMismatch: graphs was supposed to be a Array, but was a String
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/attribute_methods/read.rb:106:in `unserialize_attribute'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/attribute_methods/read.rb:82:in `read_attribute'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/base.rb:1586:in `attribute_for_inspect'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/base.rb:1667:in `block in inspect'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/base.rb:1665:in `collect'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/base.rb:1665:in `inspect'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/activerecord-3.0.5/lib/active_record/associations/association_proxy.rb:146:in `inspect'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.5/lib/rails/commands/console.rb:44:in `start'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.5/lib/rails/commands/console.rb:8:in `start'
    from /Users/dlipa/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.0.5/lib/rails/commands.rb:23:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

解决方案

I was having a problem similar to this one. My problem stemmed from the placement of my serialize :some_column, Array statement. If by some chance the attribute methods on your ActiveRecord object class get defined before you call serialize, you will not have the setter and getter methods properly defined.

So, I would make sure that the define_attribute_methods is not being called on your Settings class before you declare which columns are serialized.

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