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ruby-on-rails

How to interpret Rails stats outputs table data?

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How to interpret Rails stats?
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What does the following columns means?

  • Lines
  • LOC
  • M/C
  • LOC/M

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When looking at the output from rake stats, there are a few important bits of information that you should look at first, and that are all in the final summary line, in this case:

  • Lines of Code (Excluding test code): 337
  • Lines of Test Code: 406
  • Code to Test Ratio: 1:1.2

A Code to Test Ratio of 1:1.2 is pretty good.
For example, a Code to Test Ratio of 1 to 4 is somewhat ridiculous. Its incredibly high, and when you see something like this, its important to ask why? That’s pretty much the entire usefulness of the output of rake stats as a metric. Here are some -personal- guidelines:

  • Anything less than 1:1 the code probably lacks sufficient tests.
  • Anything more than 1:2 is suspect to questioning, but upon investigation could be found to be perfectly reasonable.

There are a few other nice things in the output from rake stats that are helpful for a birds eye view of the application. For example, I can tell that your application has 6 models and 5 controllers.

Hope that helped.

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