I wonder if the fact that this currently doesn't work the way you want it to
is a necessary consequence of structural sharing and the desired performance
guarantees of dissoc.
In other words: I wonder if, on account of how struct maps are implemented
(sort of like a vector, right?), the only way to get a hash map with one key
gone is to do a linear copy of the struct map.
If that's true (I have no idea if it is!), then there might be a reason for
forcing you to do
(dissoc (into {} mystruct) :akey)
explicitly. Namely, it preserves the performance guarantees of dissoc.
Garth
On Tue, Dec 15, 2009 at 5:05 AM, ataggart <alex.tagg...@gmail.com> wrote:
>
>
> On Dec 14, 11:23 pm, Richard Newman <holyg...@gmail.com> wrote:
> > Something I keep bumping into: the SQL library returns rows as struct-
> > maps. Often I want to do things like rename keys (:foo_bar => :foo-
> > bar), strip out :id columns, etc.
> >
> > Nope!
> >
> > java.lang.Exception: Can't remove struct key
> >
> > Any opinions on returning a hash-map after 'removing' (remember, these
> > are persistent data structures) a key from a struct-map? They print
> > the same, act the same... except in this instance.
>
> So have (dissoc mystruct :akey) act like (dissoc (into {}
> mystruct) :akey)? Sounds reasonable to me.
>
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