TypeError:无法读取未定义的属性'createProduct‘？(来自graphql mutation.js文件)

Question

当我为面向公众的API (localhost)编写相同的查询时，我得到错误：

TypeError: Cannot read property 'createProduct' of undefined
    at createProduct (/Users/gavish/Desktop/Final Beta/sick-fits/backend/src/resolvers/Mutation.js:5:42)
    at field.resolve (/Users/gavish/Desktop/Final Beta/sick-fits/backend/node_modules/graphql-extensions/lib/index.js:119:77)
    at resolveFieldValueOrError (/Users/gavish/Desktop/Final Beta/sick-fits/backend/node_modules/graphql/execution/execute.js:531:18)
    at resolveField (/Users/gavish/Desktop/Final Beta/sick-fits/backend/node_modules/graphql/execution/execute.js:495:16)
    at /Users/gavish/Desktop/Final Beta/sick-fits/backend/node_modules/graphql/execution/execute.js:339:18
    at /Users/gavish/Desktop/Final Beta/sick-fits/backend/node_modules/graphql/jsutils/promiseReduce.js:25:10
    at Array.reduce (<anonymous>)
    at promiseReduce (/Users/gavish/Desktop/Final Beta/sick-fits/backend/node_modules/graphql/jsutils/promiseReduce.js:22:17)
    at executeFieldsSerially (/Users/gavish/Desktop/Final Beta/sick-fits/backend/node_modules/graphql/execution/execute.js:336:38)
    at executeOperation (/Users/gavish/Desktop/Final Beta/sick-fits/backend/node_modules/graphql/execution/execute.js:289:55)

由于我是graphql的新手，使用graphql和Prisma数据库，当我为demo-prisma服务器编写查询和突变时，我能够查询和更改对象，但不能在我的应用程序的公共api的本地主机端点上！

下面是我的突变文件，它显示了一个错误：

const Mutations = {
    async createProduct(parent, args, ctx, info) {
        console.log('mutation started!')
        const product = await ctx.db.mutations.createProduct({
            data: {
                ...args
            }
        }, info)
        console.log('mutation done!')
        return product
    }
};

module.exports = Mutations;

这也是我的schema.graphql文件

# import * from './generated/prisma.graphql'

type Mutation {
  createProduct(
  id:ID
  name: String
  description: String
  price: Int
  colors: String
  quantity: Int ): Product!
}

type Query {
products:[Product]!
}

我认为我使用的语法有问题。还有什么是ES6格式写的变异函数！

Answer 1

这是ctx.db.mutation而不是ctx.db.mutations。

您可能希望切换到prisma-client而不是prisma-binding，因为它更具类型安全，这样您就可以避免像这样的错误。

https://www.prisma.io/docs/prisma-client/