Custom scalar types
Apollo supports custom scalar types, such as Date.
You first need to define the mapping in your build.gradle file. This maps from the GraphQL type to the Java/Kotlin class to use in code.
Groovy
Kotlin
1apollo {
2 customTypeMapping = [
3 "Date" : "java.util.Date"
4 ]
5}1apollo {
2 customTypeMapping.set(mapOf(
3 "Date" to "java.util.Date"
4 ))
5}Next, register your custom adapter and add it to your ApolloClient builder:
Kotlin
1val dateCustomTypeAdapter = object : CustomTypeAdapter<Date> {
2 override fun decode(value: CustomTypeValue<*>): Date {
3 return try {
4 DATE_FORMAT.parse(value.value.toString())
5 } catch (e: ParseException) {
6 throw RuntimeException(e)
7 }
8 }
9
10 override fun encode(value: Date): CustomTypeValue<*> {
11 return GraphQLString(DATE_FORMAT.format(value))
12 }
13}
14
15ApolloClient.builder()
16 .serverUrl(serverUrl)
17 .addCustomTypeAdapter(CustomType.DATE, dateCustomTypeAdapter)
18 .build()