尝试使用 Mutation 删除，但它给出错误提示 authorsCollection.delete is not a function

Question

当我尝试运行它时，它给我 error.Trying 使用 Mutation 删除但它给出错误说 "authorsCollection.delete" 不是函数

const Mutation = new GraphQLObjectType({
  name: "Mutations",
  fields: {
    DeleteAuthor: {
      type: Author,
      args: {
        _id: {type: new GraphQLNonNull(GraphQLString)},
        name: {type: GraphQLString},

      },
      resolve: function(rootValue, args) {
        let author = Object.assign({}, args);
        console.log(args);
        return authorsCollection.delete(author._id)
          .then(_ => author);
      }
    }

我应该在代码中编辑什么才能实现删除操作？

它给我如下错误

{
  "data": {
    "DeleteAuthor": null
  },
  "errors": [
    {
      "message": "authorsCollection.delete is not a function",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ]
    }
  ]
}

Answer 1

错误消息 authorsCollection.delete is not a function 表明 authorsCollection 没有任何名为 delete 的函数。在您的 jsfiddle 代码中，我看到您使用了 promised-mongo 库。删除文档的 API 是 remove，而不是 delete。

改为

authorsCollection.remove({_id: ObjectId(author._id)})

传递的_id是一个字符串。但是DB中author的_id属性是ObjectID类型。因此，您必须将其转换为 ObjectID 类型。您可以使用 promised-mongo 的 ObjectId 来实现。所以，在开头导入它：

import {ObjectId} from 'promised-mongo';

尝试使用 Mutation 删除，但它给出错误提示 authorsCollection.delete is not a function

Trying to delete using Mutation but its giving the error saying authorsCollection.delete is not a function

graphql

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graphql-js