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I agree with GP as well, but I do think there are unique circumstances with GraphQL. One difference is that if the front-end makes N+1 REST calls, it's (hopefu
by baumandm 6y ago
I agree with GP as well, but I do think there are unique circumstances with GraphQL.
One difference is that if the front-end makes N+1 REST calls, it's (hopefully) obvious to the front-end developer. It's also generally easy to map the REST requests to the database queries being made.
Swap it all out for a single GraphQL query and now you have no idea how it will perform or whether it was optimized for the specific fields you are requesting.
Another difference is that REST-style solutions won't work for GraphQL. Imagine you're making a bunch of REST calls, e.g. querying for a list of articles then querying for a list of comments for each one. You can ask the backend team for a new endpoint that returns them all in one query, easy enough.
But with GraphQL schemas, the potential graph of data is too large to write custom SQL queries that efficiently fetch everything in one batch. For example:
{
articles {
title
contents
author {
name
articles {
title
contents
comments {
content
author {
...
}
}
}
}
comments {
content
author {
name
}
}
}
}
Maybe a bit contrived, but it illustrates my point. Due to the ability to traverse relationships it's much easier to find yourself in a situation where the implementation of the GraphQL resolvers is not ideal for the usage, but it theoretically will work.
- valenterry 6y agoThe GraphQL equivalent to creating a new, specialized REST route would be to create a new, specialized query. E.g. the following REST /articles-with-comments?number=20 which returns title, contents etc. would map to a completely new query in graphql articlesWithComments(number: Integer) { title contents ... } so it is exactly as easy to optimize. Of course this is not very composable, but that is equally true for both solutions.
- gabereiser 6y agoand this is the pattern we see in the wild mostly.
- Aeolun 6y agoApparently you could solve this using the dataloader pattern/library. Every layer would send off one query, unless they’re dependent on each other, but it’d be a far cry from N+1