hollow wharf
I have the following DTO:
export class DataTableRequestDto /extends MetricDataRequestDto<TableMetricRequestDto>/ {
@ApiProperty()
@ArrayLength(2)
@Transform(({ value }) => value.map(DateTime.fromISO))
timeFrame: string[];
}
For whatever reason this transformation results in an error from Luxon
"Cannot read properties of undefined (reading 'zone') "
Any idea what's going on here?
ocean lily
do some debugging like this:
@Transform(({ value }) => value.map(e => { console.debug({e}); return DateTime.fromISO(e) }))
analog pulsar
This is a common trap with array.map(fn)
If fn accepts exactly one argument, this is fine
Buf if fn can accept multiple arguments, then these will be passed, because map passed the item, index and the entire array, respectively, as the three arguments to fn
Which, I presume, is the reason for the error, because DateTime.fromISO optionally accepts more parsmeters, but they are wrong
The simple.fix is to wrap fn into an unary lambda array.map(e => fn(e))
hollow wharf
Thanks for the advice guys.
I tried both of your suggestions and got the same issue.
When debugging, I noticed that the error is coming from luxon. After a couple of successful calls, somehow, luxon is called without going through the constrictor. Meaning the config is null and from there the error stems
hollow wharf
So the issue had to do with a package that I was using which had a module that was adding an interceptor that had the arguments "transform: true".