Forum: Ruby on Rails Clarifying dynamic find_by_attribute deprecations

I've seen a number of blog posts claiming all dynamic find_by_attribute
methods are deprecated come Rails4 (with extraction to a gem).  However,
the Rails release notes specify that some of the API remains:
http://edgeguides.rubyonrails.org/4_0_release_note...

There was initial confusion in this pull request over what all was
deprecated:
https://github.com/rails/rails/pull/8989

The comments there seem to indicate 
find_by_attribute_and_other_attribute
will be deprecated but find_by_attribute is not;  the Rails release note
doesn't seem to go that far.

I think it's worth getting clarity on this, and then maybe I (or 
somebody)
can make it more explicit in the notes if need be.