Pry step function namespace collision with cucumber #14

daveroberts opened this Issue Jun 4, 2012 · 5 comments


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Pry's step function has a namespace collision with cucumber's step function. Calling step when inside a binding pry from within cucumber causes an infinite loop. Setting an alias doesn't help. Perhaps in addition to alias, there should be a rename?


We've logged this in Cucumber here. I'm over here to see how I can help.

It seems to me that there should be a way for pry-nav to add its commands into the context of the REPL session without stomping on the methods of the class it's debugging, but that's just my first impression :)

How can we best solve this?

banister commented Jun 4, 2012

@daveroberts The current ways to resolve a command/method collision aren't sufficient?

  1. Prepend a space before typing step (this will invoke the RSpec step)
  2. You can turn on Pry.config.command_prefixthis will require you to type %step (typically) before the pry-nav step command is invoked.
  3. You can manually rename step yourself in your .pryrc, i.e `Pry.commands.rename "my-step", "step"
nixme commented Jun 4, 2012

I don't understand how it causes an infinite loop. Either pry-nav's step gets invoked or cucumber's. If there's an infinite loop, besides the naming conflict, there might also be a bug in pry-nav's step?

Do you no longer get the infinite looping if you rename the step command like @banister showed in option 3?


I'm unable to reproduce this in a stripped down Rails environment, and I can't share the source for the project this is occurring in. If I can reproduce in a smaller environment I'll revisit this issue.

nixme commented Jun 12, 2012

@mattwynne @daveroberts Somewhat unrelated to this issue, but I've rewritten pry-nav with a different tracing mechanism and additional features. I encourage you to try it out:

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