UDF GraphQL resolver with nested type

[ptpaterson]

Hi @ClaudiaGiv!

first, you want @index here. The docs provide such an example, so you should check that out.

@index directive

In fact, fauna will automatically generate the index Query with just the following

type Query {
  boardsByTitle(title: String): [Board!]!
}

if you want to piggy back the existing index then call out @index(name: 'board_by_title')

But if you want to use a UDF, do not attempt to expand the related field. The strategy is to return just the an array of Documents. Or a whole Page. If you are not paginating, then your UDF would return something like Select('data', Paginate(...))

See also:

Best Practices for custom GraphQL resolvers

More of a How-To, than a best practice, but since Pagination with GraphQL resolvers is a bit confusing, here are some things on that: Using Pagination Arguments in a UDF Docs can be helpful, even if they get a bad reputation! They have a good example of how to use pagination arguments in a UDF. I created a helper function that builds on that example: const paginateWithOptions = (set, size, after, before) => q.If( q.Equals(before, null), q.If( q.Equals(after, null), q.P…