如何在 GraphQL 中将复杂的 object 作为标量类型返回？

Question

Let's imagine we have GraphQL API that can return an object Entity with Id and Name properties and I requested Name only:

query {
    entities {
        name
    }
}

And it returns

{
    "data": {
        "entities": [
        {
            "name": "Name1"
        },
        {
            "name": "Name2"
        }
        ]
    }
}

But what if I want to have only the name of entities as a scalar type? In other words, I want to have something like:

{
    "data": {
        "entities": [
            "Name1",
            "Name2"
        ]
    }
}

Is it possible to have such result without changes on the GraphQL API side? Aliases, Fragments, etc. GraphQL has a lot of built-in query capabilities, but none of the known me can return complex objects as scalar type.

Answer 1

what you're asking for is almost impossible if you don't want to change the type definition for Entities .

This:

Entity: id: int! name: String
entities(): [Entity]

returns an array of objects with keys name and id .

To achieve what you're asking you either change Entity to be just a string or have your client reduce that object to an array of just Entity names when they receive it.

They could do something like this:

 const data = { entities: [ { name: 'Name1', }, { name: 'Name2', }, ], }; const entityNames = data.entities.reduce( (acc, curr) => [...acc, curr.name], [] ); console.log(entityNames);