字段别名

Alias:
  Name:

By default, the key in the response object will use the field name queried. However, you can define a different name by specifying an alias.

In this example, we can fetch two profile pictures of different sizes and ensure the resulting object will not have duplicate keys:

{
  user(id: 4) {
    id
    name
    smallPic: profilePic(size: 64)
    bigPic: profilePic(size: 1024)
  }
}

Which returns the result:

{
  "user": {
    "id": 4,
    "name": "Mark Zuckerberg",
    "smallPic": "https://cdn.site.io/pic-4-64.jpg",
    "bigPic": "https://cdn.site.io/pic-4-1024.jpg"
  }
}

Since the top level of a query is a field, it also can be given an alias:

{
  zuck: user(id: 4) {
    id
    name
  }
}

Returns the result:

{
  "zuck": {
    "id": 4,
    "name": "Mark Zuckerberg"
  }
}

A field’s response key is its alias if an alias is provided, and it is otherwise the field’s name.