active_record_patch.rb (ActiveRecord::Base#method_missing monkey patch) interferes with dynamic finders

[smtlaissezfaire]

Why is method_missing overwritten on ActiveRecord::Base?

This took plenty of my time today: tracking down why dynamic finders like find_by_foo! weren't working, but find_by!(foo: ...) was working. Here's a debugging session that tracked it down:

https://gist.github.com/smtlaissezfaire/1669e7ddc66773c3a95794ce41b29d49

This happened when I ran the following:

rake db:drop db:create db:migrate db:seed

Strangely enough it didn't happen when I ran seeds alone:

rake db:seed

I guess the annotate code wasn't loaded in the second example, which is why I didn't run into it.