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kotlinlang

```AppScope.launch {
            DataAccess.getRecords().catch {
                Toast.error("Błąd pobierania danych z serwera")
            }.then { records -&gt;
                println("Records: $records")
                val filtered = ArrayList&lt;EntryRecord&gt;()
                for(record in records.unsafeCast&lt;List&lt;EntryRecord&gt;&gt;()) {
                    if(!record.pricePrepaidConfirmed || !record.priceTotalConfirmed) {
                        filtered.add(record)
                    }
                }```
records variable is of type kotlin.Unit apparently...

```fun getRecords(): Promise&lt;List&lt;EntryRecord&gt;&gt; {
    return RestClient().call("/api/v1/records")
}```


try this:
```fun getRecords(): Promise&lt;List&lt;EntryRecord&gt;&gt; {
    return RestClient().call("/api/v1/records") {
        deserializer = ListSerializer(EntryRecord.serializer())
    }
}```


No, it's a small project I'm working on, but the endpoint response is this:

``````

```[{"id":1,"creationDate":null,"contractType":"Test","contractNumber":"Test","pricePrepaid":20099,"pricePrepaidConfirmed":false,"priceTotal":400099,"priceTotalConfirmed":false,"additionalInformation":""}]```

Also since it doesnt look like kvision has any specific piping for handling reponses from server-side APIs, I should probably move this question to javascript channel I think...

It seems to work for me but you have got a typo "additionaInformation" instead of "additionalInfo".

Also new  `RestClient` from KVision 5 doesn't include serialization module for `Date` type. So you will need to provide a serializer if you want to use `Date`.
E.g.:
```    fun getRecords(): Promise&lt;List&lt;EntryRecord&gt;&gt; {
        return RestClient{
            serializersModule = serializersModuleOf(DateSerializer)
        }.call("/test.json") {
            deserializer = ListSerializer(EntryRecord.serializer())

        }
    }```

And what do you mean by "specific piping for handling reponses from server-side APIs"?

&gt; And what do you mean by "specific piping for handling reponses from server-side APIs"?
A long time ago when I was trying to learn js I remember that a few frameworks had some helper methods to fetch data from the backend, I suspected that kvision might have something like this as well

&gt; It seems to work for me but you have got a typo "additionaInformation" instead of "additionalInfo".
Eh, where? Full project search for the phrase returns only additionalInformation in my project. Also I setill have the same problem...

Can't tell if I was using old sources or if it's what I think, but when I return the final list instead of a promise everything seems to work correctly