I need more context to give a complete answer. The error message means
that some type is not uniquely determined, and the message will show you
where the undetermined type appears.
My first guess, though: Start the function declaration like this:
fun checkPassword (r : {Email : string, Password : string}) =
Otherwise, there might be other fields in [r].
On 10/21/2012 05:39 PM, David Snider wrote:
What's the correct way of doing this?
Error: Some constructor unification variables are undetermined in
declaration
cookie userSession : { Email : string, Password : string }
... snip ...
fun checkPassword r =
let
val cryptPass = {Email=r.Email, Password=Sha.hash r.Password}
in
re' <- oneOrNoRows1(SELECT user.Id
FROM user
WHERE user.Email = {[cryptPass.Email]}
AND user.Password = {[cryptPass.Password]});
case re' of
None => return False
| Some re => setCookie userSession { Value = cryptPass,
Expires=None,Secure=False };
return True
end
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