Ruby on Rails

You can generally use debuggers anywhere in Ruby code. (most of the community prefers byebug I think, but I can't speak for everyone. I know some who still use pry).

In your views, sometimes I stick a debugging statement in just inside the markup, like so (assuming your view is ERB):

The only exceptions to that might be a cached partial, which won't get re-evaluated. To work around such a problem, remove the caching or clear the Rails cache. 

-Jason

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