Yes and no. The PR for master demonstrated  that building from params and
from build are different. For 4.0 even the behaviour is the same, given the
different API it'd still be a good idea to have the coverage IMO.

On Thursday, May 8, 2014, Carlos Antonio da Silva <notifications@github.com>
wrote:

> In activerecord/test/models/developer.rb:
>
> > @@ -19,6 +19,8 @@ def find_most_recent
> >      end
> >    end
> >
> > +  accepts_nested_attributes_for :projects
>
> Yes, but you could build the developer record and the project record and
> associate them, wouldn't that work the same?
>
> —
> Reply to this email directly or view it on GitHub<https://github.com/rails/rails/pull/14995/files#r12407871>
> .
>


-- 

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