GraphQl array object inside object

Question

I do a json call from a api to get a list of posts. My problem is that inside of every post object response, i have a other array of object for the category of the post. How can get the array object category using Graphql?

i try this but return me error

const Cat = new ObjectType({
name: 'CatItem',
description: 'cat',
fields: () => ({


    id: {
        type: new NonNull(ID),
        description: 'cat',
        resolve: (root) => root.id
    },
    slug: {
        type: StringType,
        description: 'cat',
        resolve: (root) => root.slug
    },
    name: {
        type: StringType,
        description: 'cat',
        resolve: (root) => root.name
    },


}),
});

const PostType = new ObjectType({
name: 'PostItem',
description: 'post',
fields: () => ({
    id: {
        type: new NonNull(ID),
        description: 'post',
        resolve: (root) => root.id
    },
    slug: {
        type: StringType,
        description: 'post',
        resolve: (root) => root.slug
    },
    title: {
        type: StringType,
        description: 'post',
        resolve: (root) => root.title
    },
    content: {
        type: StringType,
        description: 'post',
        resolve: (root) => root.content
    },
    categories: {
        type: new List(CatType),
        description: 'post',
        resolve: (root) => root.category
    },
    date: {
        type: StringType,
        description: 'post',
        resolve: (root) => root.date
    },
    authorName: {
        type: StringType,
        description: 'post',
        resolve: (root) => root.display_name
    },
    authorAvatar: {
        type: StringType,
        description: 'post',
        resolve: (root) => root.user_avatar
    },
}),
});

Thank you

In general, if something is giving you an error, you should also post what the error is. It help others get an idea of what is wrong. — Andy Carlson
– Andy Carlson, Commented Oct 17, 2016 at 9:08
My error message is Field "categories" of type "[CatItem]" must have a sub selection — gig
– gig, Commented Oct 17, 2016 at 12:40

Eric Streeper · Accepted Answer · 2016-10-17 16:25:19Z

0

You're getting that message because you have to tell GraphQL which fields (the subselection) within categories you want to retrieve.

You're probably trying to run a query something like this:

{
  post(id: 1) {
    title
    categories
  }
}

But you need to specify the fields to return (subselection) on categories, like the following:

{
  post(id: 1) {
    title
    categories {
      name
    }
  }
}

Incidentally, there is a great tool called GraphiQL which is especially helpful when getting started writing queries. You might want to take a look at the middleware express-graphql.

answered Oct 17, 2016 at 16:25

Eric Streeper

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1 Comment

gig Over a year ago

I try to get all the posts but inside each post, i have a array object of each category like this.

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