BigDecimal不能被强制转换为BigDecimal
这应该很简单，但它正在爆炸。 有任何想法吗？
d = BigDecimal.new("2.0") YAML::load({:a => d}.to_yaml) TypeError: BigDecimal can't be coerced into BigDecimal from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/inspector.rb:86:in `inspect' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/inspector.rb:86:in `inspect' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/inspector.rb:86:in `block in ' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/inspector.rb:30:in `call' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/inspector.rb:30:in `inspect_value' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/context.rb:260:in `inspect_last_value' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb.rb:311:in `output_value' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb.rb:160:in `block (2 levels) in eval_input' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb.rb:273:in `signal_status' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb.rb:156:in `block in eval_input' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/ruby-lex.rb:243:in `block (2 levels) in each_top_level_statement' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `loop' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `block in each_top_level_statement' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `catch' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `each_top_level_statement' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb.rb:155:in `eval_input' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb.rb:70:in `block in start' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb.rb:69:in `catch' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb.rb:69:in `start' from /Users/benjohnson/.rvm/rubies/ruby-1.9.3-p125/bin/irb:16:in `'Maybe IRB bug! 这是一个已报告并修复的错误。
最好的解决方案是升级到最新的Ruby（修补程序在补丁级别194以后）。
如果您无法升级Ruby版本，可以通过安装Psych gem来获得修复。 如果你这样做，你需要在你require 'yaml' gem 'psych'之前添加Gemfile require 'yaml' （或者如果你使用Bundler将它添加到你的Gemfile ）来从gem而不是从标准库加载代码。
是的，我遇到过那一次。 这是我所做的一个版本：
YAML和BigDecimal解决方法
这是大卫的回答，由于这个相关的问题 ，更新到1.9.3工作：
require 'yaml' require 'bigdecimal' YAML::ENGINE.yamler= 'syck' class BigDecimal def to_yaml(opts={}) YAML::quick_emit(object_id, opts) do |out| out.scalar("tag:induktiv.at,2007:BigDecimal", self.to_s) end end end YAML.add_domain_type("induktiv.at,2007", "BigDecimal") do |type, val| BigDecimal.new(val) end x = BigDecimal.new("2.0") puts x.to_yaml y = YAML.load(x.to_yaml) puts x == y