On Apr 13, 3:25 pm, Shawn <[email protected]> wrote:
> Thanks, Jeremy.
>
> Why must it clone instead of returning self? A dataset filtered by an
> empty argument need not change at all, so why not just return the same
> dataset? Is this to uphold the expectation that filter will always
> return a new object, so subsequent operations do not affect the
> original?
Yes:
ds = Album.dataset
ds = ds.filter(h) # where h can be {}
ds.filter!(:a=>1)
Because Sequel allows mutable actions on datasets, all dataset methods
that return clones must do so in all cases. They can't clone in some
cases and not others.
Jeremy
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