GraphQL array/list variables?

Question

I want to use an array/list as variable for a GraphQL mutation like this:

Schema

type User {
  id: Id!
  email: String
  name: String
  bookmarks: [Bookmark]
}

type Mutation {
  updateUser(data: UserInput!): User
}

input UserInput {
  email: String
  name: String
  bookmarks: [Bookmark]
}

type Bookmark {
  vidId: String!
  timestamp: Int!
}

Mutation

mutation($email: String, $name: String, $bookmarks: [{vidId: String!, timestamp: Int!}]) {
  updateUser(data: {email: $email, name: $name, bookmarks: $bookmarks}) {
    email
    name
  }
}

However, the variable syntax in the mutation regarding the bookmarks array seems invalid. How can I pass in an array as a GraphQL variable?

I'm not sure, Bookmark is also used elsewhere outside the input type. Does everything in the input type have to be recursively input types? Edit: I added another type to show this — rasperry
– rasperry, Commented Mar 24, 2020 at 19:34
Yes, I'm pretty certain that they do. Does your schema validate? — Bergi
– Bergi, Commented Mar 24, 2020 at 19:39

Bergi · Accepted Answer · 2020-03-24 19:31:38Z

2

GraphQL does not support anonymous type declarations (that {vidId: String!, timestamp: Int!} literal), you must refer to a named type (or a list of it or a non-null of it). So just write

mutation($email: String, $name: String, $bookmarks: [BookmarkInput]) {
#                                                    ^^^^^^^^^^^^^
  updateUser(data: {email: $email, name: $name, bookmarks: $bookmarks}) {
    email
    name
  }
}

instead with a

input BookmarkInput {
  vidId: String!
  timestamp: Int!
}

defined in your schema.

answered Mar 24, 2020 at 19:31

Bergi

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2 Comments

rasperry Over a year ago

I see. Does this have to be an input type? I thought only the outmost layer has to be input type, because String, Int are not input types

Bergi Over a year ago

@rasperry String and Int are scalar types (not object types). Those can be contained in both input and output types.

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