Created
January 14, 2018 14:54
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My Ruby Debugging Cheatsheet
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| # Figure out where a method was defined | |
| object = Object.new | |
| puts object.method(:blank?).source_location | |
| # Opening a dependency from a project | |
| $ bundle open active_support | |
| # Find which method Super is Calling | |
| def foo | |
| puts method(:foo).super_method.source_location | |
| super | |
| end | |
| # List all methods on an object | |
| object.methods | |
| # Un-debug a gem | |
| $ gem pristine activesupport # $ gem pristine --all | |
| # Print stack | |
| puts "#" * 90 | |
| puts caller | |
| puts "#" * 90 | |
| # or just `raise` | |
| # Vim Shortcut | |
| # " puts the caller | |
| # nnoremap <leader>wtf oputs "#" * 90<c-m>puts caller<c-m>puts "#" * 90<esc> | |
| # Print source location of method | |
| p method(:render).source_location | |
| # Disassemble Ruby code: | |
| code = <<~CODE | |
| a = 4 | |
| b = 10 | |
| puts a + b | |
| CODE | |
| puts RubyVM::InstructionSequence.compile(code).disasm | |
| References: | |
| 1) http://www.schneems.com/2016/01/25/ruby-debugging-magic-cheat-sheet.html | |
| 2) https://tenderlovemaking.com/2016/02/05/i-am-a-puts-debuggerer.html |
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