Question

When I get exceptions, it is often from deep within the call stack. When this happens, more often than not, the actual offending line of code is hidden from me:

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 

That ‘… 8 levels…’ truncation is causing me a great deal of trouble. I’m not having much success googling for this one: How do I tell ruby that I want dumps to include the full stack?

Answer 1

Exception#backtrace has the entire stack in it:

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

(Inspired by Peter Cooper’s Ruby Inside blog)