ruby - 如何让 ruby​​ 打印完整的回溯而不是截断的回溯？

Question

当我遇到异常时，它通常来自调用堆栈的深处。发生这种情况时，我通常会隐藏实际的违规代码行:

tmp.rb:7:in `t': undefined method `bar' for nil:NilClass (NoMethodError)
        from tmp.rb:10:in `s'
        from tmp.rb:13:in `r'
        from tmp.rb:16:in `q'
        from tmp.rb:19:in `p'
        from tmp.rb:22:in `o'
        from tmp.rb:25:in `n'
        from tmp.rb:28:in `m'
        from tmp.rb:31:in `l'
         ... 8 levels...
        from tmp.rb:58:in `c'
        from tmp.rb:61:in `b'
        from tmp.rb:64:in `a'
        from tmp.rb:67

那个“... 8 levels...”的截断给我带来了很大的麻烦。我在谷歌搜索上没有取得多大成功:如何告诉 ruby​​ 我希望转储包括完整堆栈？

Answer 1

Exception#backtrace 包含整个堆栈:

def do_division_by_zero; 5 / 0; end
begin
  do_division_by_zero
rescue => exception
  puts exception.backtrace
  raise # always reraise
end

(灵感来自 Peter Cooper 的 Ruby Inside 博客)