On 07/27/2015 07:50 PM, Stefan Scott Alexander wrote:
Strangely, this error message mentions a field [Id = string] - but my
code only uses [Id = int].
The problem is in this code, where you use [r.Id] as an <option> value,
which must be a string. The type of [option] in basis.urs makes that
requirement explicit.
colorOptions <-
queryX1 (SELECT * FROM color)
(fn r => <xml> <option value={r.Id}> {[r.Nam]} </option> </xml>);
The Ur/Web compiler gives the following error:
```
Some constructor unification variables are undetermined in declaration
(look for them as "<UNIF:...>")
```
It can be difficult to debug this error, as it refers to a wide range
of lines (covering all the function definitions).
As the message indicates, you're supposed to do a text search for
"<UNIF:" to see where the undetermined unification variables are.
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