GraphQL nested filter

Users
1

For example I have a schema:

type Author {
    name: String
    books: [Book] @hasInverse(field: author) 
}
type Book {
    author: Author @hasInverse(field: books) 
    genre: String @search(by: [hash])
}

Is it possible to make nested filter? Something like that:

{
    queryAuthor(filter: { books: { genre: { eq: "detective" }}}) {
        name
        books {
            name
            genre
        }
    }
}

Here I want to get all the authors who wrote books in the genre of detective (and their books)

2 Likes
2

Hi, thanks for looking at our GraphQL features.

Filtering a result based on some deeper feature in the graph is a really powerful thing. Problem is the level of nesting needed is unbounded, so that ends up making a really big schema and really deep queries.

In our extended GraphQL± query language, you can do queries like this with query variables (https://docs.dgraph.io/query-language/#query-variables) or the handy uid_in function (https://docs.dgraph.io/query-language/#uid-in). We are planing on adding those sorts of feature in a GraphQL compliant way.

In the current GraphQL implementation, you’ll need to issue multiple queries where you restrict by ids to create the same effect.

3

Hey @poketulhu,

Adding onto what @michaelcomptonsaid, you can also check out the section on cascade in this blog https://blog.dgraph.io/post/tutorial-8-getting-started/ .
Cascade in Dgraph’s GraphQL± query language helps you filter the top layer results based on the filter in the deeper parts of the query.

4

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