class UserEntity(val id: UUID, val name: String, val email: String){
val occupation: String? =null
}
class AddressEntity(val id:UUID){
val line1: String,
val line2 : String,
val city: City,
val state: State,
val zipcode: ZipCode
@ManyToOne
@JoinColumn(name = "user_id", referencedColumnName = "id")
var user: UserEntity
}
class UserResolver(private val userService: UserService) {
@DgsQuery(field = DgsConstants.QUERY.GetUsers)
fun getUsersByLocation(
dfe: DataFetchingEnvironment
): UsersPagedResult {
return userService.getAllUsersByLocation(getLocation(dfe))
}
@DgsData(parentType = "User", field = "addressList")
fun getAddressList(dfe: DgsDataFetchingEnvironment): CompletableFuture<Address>? {
val dataLoader: DataLoader<UUID, Address> = dfe.getDataLoader<UUID, Address>(
AddressDataLoader::class.java
)
val user = dfe.getSource<User>()
return dataLoader.load(user.id)
}
}
I have a resolver for getUserList(). I also have a dataLoader for addresses. I want to return users only if the user has an address. Basically, even if the parent resolver returns 10 users, but the address dataloader returns addresses for only 8 users, I want to remove the 2 users who do not have address, from the Parent resultset. How can we achieve this? I wanted to try SchemaDerivative but not sure, if the filed will have access to the children.
Note: I have given an example usecase. I know for the above usecase, its easier to achieve this with the DB query. My original usecase is complicated, where I have to join multiple tables to achieve this and the addresses can only be loaded as data loaders.
