Ruby Rescue To Display Full Backtrace

Question

Here's a real quick example:

puts File.join(nil, "hello") 

Would output

test.rb:4:in 'join': can't convert nil into String (TypeError) from test.rb:4 

But when I do this:

begin   puts File.join(nil, "hello") rescue => exception   puts exception.backtrace end 

This will output

test.rb:4:in 'join' test.rb:4 

Now how do I capture the full backtrace, including the "can't convert nil into String (TypeError)" part?

@Sarah Vessels: In my specific code, this snippet:

puts "==============================" puts error.message puts "==============================" puts error.inspect puts "==============================" puts error.backtrace puts "==============================" 

returns

============================== exit ============================== #<SystemExit: exit> ============================== /usr/lib/ruby/1.8/glib2.rb:37:in `exit' /usr/lib/ruby/1.8/glib2.rb:37:in `exit_application' multi.rb:234:in `main' multi.rb:347 ============================== 

Answer 1

The value is stored there somewhere, based on this call to #inspect:

irb(main):001:0> begin irb(main):002:1* puts File.join(nil, "Hello") irb(main):003:1> rescue => exception irb(main):004:1> puts exception.inspect irb(main):005:1> end #<TypeError: can't convert nil into String> => nil 

Exception#message is the descriptive part:

irb(main):006:0> begin irb(main):007:1* puts File.join(nil, "hello") irb(main):008:1> rescue => ex irb(main):009:1> puts ex.message irb(main):010:1> end can't convert nil into String => nil 

So to get the type of data you're looking for, you could do something like the following:

irb(main):015:0> begin irb(main):016:1* puts File.join(nil, "hey") irb(main):017:1> rescue => ex irb(main):018:1> puts "#{ex.backtrace}: #{ex.message} (#{ex.class})" irb(main):019:1> end (irb):16:in `join'(irb):16:in `irb_binding'C:/Ruby/lib/ruby/1.8/irb/workspace.rb :52:in `irb_binding':0: can't convert nil into String (TypeError) => nil