Question

I’ve inherited a project in which an ActiveRecord model is giving me strange behaviour. This is the only model that’s behaving this way, so far.

car = Car.first
car.respond_to?(:each) # true

There is no each method defined in Car that I can find.

I read in another post that you can find out who injected the method, so I gave it a shot:

car.method(:each) # raises "undefined method `each' for class `Car'

I want to use Car with draper but because my instance behaves like an Enumerable, draper treats it as such. Draper is not the issue, however.

What should I do to figure it out?

Answer 1

The comments to my question helped me find it! I used Dmitry’s binary-search to figure out what caused it, and found the problem in a gem that the model is using. The gem, Mark Reed, overrides respond_to. So the lesson is: if responds_to is funky, perhaps it’s being overridden somewhere.