John Merlino wrote in post #1060601:
> I read in the Rails 3 Way book that when using select(), you can, in
> addition to adding calculated columns (i.g. using sql aggregate
> functions), include additional attributes in resulting object by
> passing the wild card like this:
>
> Unit.select(:*,"sum(unit_type_id) as
> total").group("created_at").having(["created_at > ?", 2.days.ago])
>
> That should give you the new method "total" in addition to the default
> attributes of the object. However, when I do it, I get this:
>
> ArgumentError: wrong number of arguments (2 for 1)

As far as I can tell from the docs Model.select takes one argument in 
all forms:

http://api.rubyonrails.org/classes/ActiveRecord/QueryMethods.html#method-i-select

So that error makes sense as far as I can tell.

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