Hello experts. The graphql-kotlin project looks gr...

# graphql-kotlin

[Eamonn]

Hello experts. The graphql-kotlin project looks great to me, but one tiny point in the ktor example was unclear. In the dataloaders, the entities are searched for based on a set of ids Book.search(ids.flatten()), and the resulting list is then filtered for only those that match that same set of ids allBooks.filter { idSet.contains(it.id) } . Is that filter not superfluous? Thanks, Eamonn https://github.com/ExpediaGroup/graphql-kotlin/blob/master/examples/server/ktor-se[…]aphql/examples/server/ktor/schema/dataloaders/BookDataLoader.kt

[Shane Myrick]

You are correct that all the ids have been filtered, but the DataLoader is actually a List<Int> for the ids mapped to a List<Book> so that is why we have the double filter there to group the ids by all books so we only have to call books.search once

I suppose what we could actually do is map every id to call the Books.search function instead, but this is just a basic example