[Rails] Re: question about a where condition

[Robert Walker]

John Merlino wrote in post #1021280:
> Hey all,
>
> This example of working code:
>
> @a = @b.where(:a_group_id.ne => nil).collect { |b| b.a_group }
>
> doesn't make too much sense to me. For one, I am not sure what that
> "ne" is doing there. Is this a postgresql thing? Second, it looks like

The "ne" is Arel's version of "Not Equal." So that's ":a_group_id not 
equal to nil"

> we are collecting active record objects where the a_group_id is null,
> collecting them in an array and then invoking the a_group association
> method on it to get its association. That doesnt make sense because
> the fact that we collected objects which had no association, how can
> we invoke the association method on it?

@a will contain a collection of the associated objects for records where 
the associated object exists (is not nil).

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