【发布时间】：2010-12-10 01:49:22
【问题描述】：
我有 3 个类具有以下关系：
战场拥有多支队伍。
BattleTeam 有一个成员数组，以及对 Battlefield 的引用。
Jaguar 是 BattleTeam 的成员，并且有对其的引用。
如果我对 Jaguar 和 BattleTeam 进行序列化/反序列化，则没有问题。序列化/反序列化 Battlefield 时会出现问题。
序列化它会产生适当的结果，但反序列化它会使 BattleTeam 中的成员为零。
让我告诉你：
>> j = Jaguar.new
=> #<Jaguar:0xa2221f8 @vitality=nil, @spirituality=nil, @log=nil, @name=nil>
#A battleteam might have many members:
>> t = BattleTeam.new
=> #<BattleTeam:0xa21fafc @members=[], @dead_members=[]>
#A battlefield might have many teams:
>> b = Battlefield.new
=> #<Battlefield:0xa2075d8 @teams=[]>
#Add a member to the team
>> t.add_member(j)
=> #<BattleTeam:0xa21fafc @members=[#<Jaguar:0xa2221f8 @vitality=nil, @spirituality=nil, @log=nil, @name=nil, @battle_team=#<BattleTeam:0xa21fafc ...>], dead_members[]
#Add a team to the battlefield
>> b.add_team(t)
=> #<Battlefield:0xa2075d8 @teams=[#<BattleTeam:0xa21fafc @members=[#<Jaguar:0xa2221f8 @vitality=nil, @spirituality=nil, @log=nil, @name=nil, @battle_team=#<BattleTeam:0xa21fafc ...>>], @dead_members=[], @battlefield=#<Battlefield:0xa2075d8 ...>>]>
#Serialize and deserialize the jaguar object (it works as expected):
>> YAML::load j.to_yaml
=> #<Jaguar:0xa1e3cdc @vitality=nil, @spirituality=nil, @log=nil, @name=nil, @battle_team=#<BattleTeam:0xa1e4204 @members=[#<Jaguar:0xa1e3cdc ...>], dead_members[], battlefield#<Battlefield:0xa1e4038 @teams=[#<BattleTeam:0xa1e4204 ...>]
#Serialize and deserialize the battle team object (it words as expected):
>> YAML::load t.to_yaml
=> #<BattleTeam:0xa1d0664 @members=[#<Jaguar:0xa1cfee4 @vitality=nil, @spirituality=nil, @log=nil, @name=nil, @battle_team=#<BattleTeam:0xa1d0664 ...>], dead_members[], battlefield#<Battlefield:0xa1d0470 @teams=[#<BattleTeam:0xa1d0664 ...>]
#Serialize and deserialize the battle team object
#(here the @members array is deserialized as nil, this is not expected!):
>> YAML::load b.to_yaml
=> #<Battlefield:0xa1c370c @teams=[#<BattleTeam:0xa1c33b0 @members=nil, @dead_members=[], @battlefield=#<Battlefield:0xa1c370c ...>]
>> YAML::load(b.to_yaml).teams[0].members
=> nil
#Here is the generated yaml, it looks right, the member is there:
>> puts b.to_yaml
--- &id002 !ruby/object:Battlefield
teams:
- &id001 !ruby/object:BattleTeam
battlefield: *id002
dead_members: []
members:
- !ruby/object:Jaguar
battle_team: *id001
log:
name:
spirituality:
vitality:
=> nil
有人知道这是怎么回事吗？
【问题讨论】：
-
请不要发布您的完整程序。大多数人不想整天回答你的问题。尝试找到仍然显示症状的最小示例。然后我们可以尝试帮助您了解为什么 ruby 的工作方式与您的预期不同。
-
事实上，它并不是完整的程序。我省略了类定义。放在那里我可以提供的最简单的示例失败：具有 2 级嵌套的嵌套结构，这就是需要 3 个不同实例的原因。它不会因为 2 就失败。我不知道我怎样才能让它更简单。
-
我们需要简单的类定义来测试它。
-
是的，这是一个错误，让一些人重现它。如果您有兴趣复制我会发布代码。
标签： ruby serialization yaml