GraphQL - 未由操作定义的变量 [英] GraphQL - variable not defined by operation

问题描述

我的 GraphQL 架构定义为:

My GraphQL schema is defined as:

type Query {
    getEntity(id: Int!): Entity
    getEntityUsers(entityId: Int!, statusId: Int): [User]
}

type Entity {
    id: Int!
    name: String!
    email: String!
    logo: String
    createdAt: DateTime!
    updatedAt: DateTime!

    users(statusId: Int): [User]
}

如您所见，我有两种方法可以为 Entity 对象获取用户.目前适用于我的查询的是 getEntityUsers 根解析器方法.此查询如下所示:

As you can see I have two ways of getting users for an Entity object. The one that is currently working for my query is the getEntityUsers root resolver method. This query looks like this:

query getEntityUsers($entityId: Int!, $statusId: Int) {
        users: getEntityUsers(entityId: $entityId, statusId: $statusId) {
            ...
        }
    }

.. 与变量:

{
    entityId: 1,
    statusId: 2
}

无论如何，是否可以通过允许我传入 statusId 来使另一种方式起作用?现在查询看起来像这样:

Is there anyway to make the other way work by allowing me to pass in the statusId? Right now the query looks like this:

query getEntity($id: Int!) {
        entity: getEntity(id: $id) {
            ...
            users (statusId: 2) {
                ... 
            }
        }
    }

这显然适用于变量:

{
    id: 1
}

但是，如果我想使用第二种方法并更改 statusId 怎么办?如果 statusId 没有在根解析器上定义，是否有任何方法可以传入?

But, what if I wanted to use this second method and change the statusId? Is there anyway to pass in the statusId if it's not defined on the root resolver?

我已经尝试过查询:

query getEntity($id: Int!) {
        entity: getEntity(id: $id) {
            ...
            users (statusId: $statusId) {
                ... 
            }
        }
    }

.. 与变量:

{
    id: 1,
    statusId: 2
}

但我刚刚收到错误消息:变量$statusId"不是由操作getEntity"定义的.有没有办法做到这一点?

But I just get the error: Variable "$statusId" is not defined by operation "getEntity". Is there anyway to do this?

推荐答案

每个操作(查询或变异)都必须明确定义您在该操作中使用的任何变量.因此，如果您有一个名为 $statusId 的变量，则必须将此变量的类型指定为操作定义的一部分:

Every operation (query or mutation) must explicitly define any variables you use inside that operation. So if you have a variable called $statusId, the type for this variable must be specified as part of your operation definition:

query getEntity($id: Int!, $statusId: Int) {
  # your selection set here
}

这些变量在您的查询中的使用位置(无论是在根级别还是其他地方)无关紧要——它们必须始终被定义为您的操作定义的一部分.

Where those variables are used within your query (whether at the root level, or elsewhere) is irrelevant -- they must always be defined as part of your operation definition.

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