From: "Víctor Adrián de la Cruz Serrano" <adrian@...>
Date: 2009-11-12T09:14:23+09:00
Subject: Re: Need help to detect error

Or anyone knows where can I contact some YAML guys to help me with this
obscure problem?

El mié, 11-11-2009 a las 16:58 +0900, Víctor Adrián de la Cruz Serrano
escribió:
> I don't know what am I doing wrong, can anyone help me?
> These two programs look very similar, but they yield different results.
> Can anyone confirm this "error"?
> 
> 
> =================================================================
> # FAILING EXAMPLE
> =================================================================
> class Battlefield
>   attr_accessor :teams
>   def initialize
>     @teams = []
>   end
>   def add_team(team)
>     @teams << team
>     team.bparent = self
>   end
> end
> 
> class Team
>   attr_accessor :members, :bparent
>   def initialize
>     @members = []
>     @bparent = nil
>   end
>   def add_member(child)
>     @members << child
>     child.team = self
>   end
> end
> 
> class Warrior
>   attr_accessor :team
>   def initialize
>     @team = nil
>   end
> end
> 
> w = Warrior.new
> t = Team.new
> t.add_member(w)
> b = Battlefield.new
> b.add_team(t)
> b.inspect
> #Convert to YAML and back
> y = YAML.load(b.to_yaml)
> #Now have a look at the "members" array inside a team... it's gone
> y.inspect
> y.teams.first.members.inspect
> 
> 
> =================================================================
> # GOOD EXAMPLE
> =================================================================
> require 'yaml'
> 
> class Battlefield
>   attr_accessor :teams
>   def initialize
>     @teams = []
>   end
>   def add_team(team)
>     @teams << team
>     team.parent = self
>   end
> end
> 
> class Team
>   attr_accessor :members, :parent
>   def initialize
>     @members = []
>     @parent = nil
>   end
>   def add_member(child)
>     @members << child
>     child.team = self
>   end
> end
> 
> class Warrior
>   attr_accessor :team
>   def initialize
>     @team = nil
>   end
> end
> 
> w = Warrior.new
> t = Team.new
> t.add_member(w)
> b = Battlefield.new
> b.add_team(t)
> b.inspect
> #Convert to YAML and back
> y = YAML.load(b.to_yaml)
> #Now have a look at the "members" array inside a team, it's still there
> y.inspect
> y.teams.first.members.inspect
> 
> 
>