GraphQL:如何处理在其自己的类型定义中引用类型? [英] GraphQL: How to handle referencing a type within its own type definition?

问题描述

假设我有以下内容:

type User {
  id: Int!
  name: String
  dob: String
  friends: [User]
}

Query {
  user(id: Int!): User
}

在我看来，我刚刚创造了无限递归的潜力:

Looks to me like I just created the potential for infinite recursion:

query GetUser($userId: Int!) {
  user(id: $userId) {
    friends {
      name
      friends {
        name
        friends {
          name
          ...etc
        }
      }
    }

  }
}

我如何在我的 user 解析器中防止这种情况发生?

How would I guard against this is in my user resolver?

推荐答案

这可能是一个潜在的问题，但您可以使用自定义验证来阻止此类请求，例如https://github.com/stems/graphql-depth-limit

This could be a potential problem, but you can use custom validation to prevent those kind of requests, e.g. https://github.com/stems/graphql-depth-limit

import depthLimit from 'graphql-depth-limit'
import express from 'express'
import graphqlHTTP from 'express-graphql'
import schema from './schema'

const app = express()

app.use('/graphql', graphqlHTTP((req, res) => ({
  schema,
  validationRules: [ depthLimit(10) ]
})))

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