Question 1

How do I set up MetricFu with SimpleCov for test coverage?

Accepted Answer

Modify your spec_helper to require SimpleCov and set the formatter to SimpleCov::Formatter::MetricFu, then run tests before metric_fu. Specify the coverage_file path in the configuration for accurate reporting.

Question 2

MetricFu vs CodeClimate for Ruby code analysis?

Accepted Answer

MetricFu is a self-hosted, customizable tool that aggregates multiple local metrics, offering more control but requiring manual setup. CodeClimate is a cloud service with automated reviews, better for teams wanting out-of-the-box integration.

Question 3

Why is my MetricFu report taking so long to generate?

Accepted Answer

MetricFu runs multiple analysis tools sequentially; enabling metrics like Flog and Flay on large codebases increases runtime. Consider disabling non-essential metrics in the .metrics configuration file to speed it up.

Question 4

How to exclude specific files from MetricFu analysis?

Accepted Answer

In the .metrics file, use the exclude option for individual metrics, e.g., for Rails Best Practices, set `rbp.exclude = ["config/chef"]` to ignore certain directories or files.

Question 5

Does MetricFu work with Ruby 3.x or later versions?

Accepted Answer

Yes, it supports MRI >= 1.9.3, including modern versions, and is tested on CI, but always check the compatibility section in the README for updates on specific Ruby releases.

Question 6

How to create a custom formatter for MetricFu?

Accepted Answer

Define a class with methods like start and finish, then reference it in configuration or command line. Examples are in the lib/metric_fu/formatter directory, and you can require it in your .metrics file.

Metric Fu

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