ruby: How to step into arbitrary function while debugging

Question

Let's say I'm stopped on point while debugging:

def get_data
    byebug
 => @cache ||= calculate_data
end

And @cache has value, so on step function calculate_data won't be executed. But I need to check what's going on inside of calculate_data at this exact runtime point.

I can just execute calculate_data and see its result in console output, but can I execute function from debug console and at same time step into it? (Using byebug or some other debugging tool).

Goal - is to inspect calculate_data logic at arbitrary time, particularly when get_data called with @cache filled.

Then in that case you have to find calculate_data and put byebug in that method. github.com/deivid-rodriguez/byebug/blob/master/GUIDE.md — Gupta
– Gupta, Commented Dec 22, 2016 at 12:40
That's incorrect suggestion, because then I will stop on initial calculation (before @cache filled). But described goal - is to inspect calculate_data at specific runtime point, particularly when @cache is set. — Daniel Garmoshka
– Daniel Garmoshka, Commented Dec 22, 2016 at 13:14
I'm interested in this question too, because Capybara's DSL works in such dynamic way that even settings breakpoint to /capybara-2.18.0/lib/capybara/node/actions.rb:237 does not make it stop when I call attach_file. — Nakilon
– Nakilon, Commented Oct 16, 2018 at 11:08

Daniel Garmoshka · Accepted Answer · 2018-10-16 14:04:32Z

3

With pry-moves you can execute separate debug of arbitrary function from current context:

def get_data
    binding.pry
 => @cache ||= calculate_data
end

Type debug calculate_data to run calculate_data and stop at first line inside of it.

answered Oct 16, 2018 at 14:04

Daniel Garmoshka

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Joseph Cho Over a year ago

answering a question from 2016 I like the commitment

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