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If it isn’t, keep going down the stack trace until you find the first reference to a file you recognize If the file is part of your project: open the faulting file on the indicated line number.Here is a general algorithm for dealing with a stack trace: It’s basically a method chain, if you keep going down you should eventually find the main method of your app. Undefined local variable or method ‘ invalid_variable‘Īs you can see the error is not that intimidating when broken down in this way.īy the way, you can find a list of exceptions here.Įvery line in the stack trace below the first one tells you how the code got here.
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However, it is a good point to start our investigation. This is where the actual error occurred, but it doesn’t mean the error condition originated here. tmp/stack.rb:6:in 'method2': undefined local variable or method 'invalid_variable' for main:Object (NameError) Running this code will give you the following error: If the problem is that your program is crashing, it is important to pay attention to the error message, which usually will contain clues of what’s going wrong. When you are getting an error from the Ruby interpreter or your program is not doing what it should be doing then it’s time to put on your debugging hat.
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Using the techniques discussed in this article you will learn how to deal with this issue and similar problems! Understanding Errors & Stack Traces This means that a nil value managed to find it’s way into our code. You may be familiar with the following error message: undefined method 'some_method' for nil:NilClass Many times our programs dont’t work like we expect, so we have to use the art of debugging ruby to help us finding out why. How often does your program do exactly what you want the first time around?