TypeError：SimpleSchema 不是 Meteor 1.6 项目中的构造函数

Question

我正在 Meteor 中为我的员工集合创建一个 SimpleSchema，我在服务器控制台中收到错误“TypeError：SimpleSchema 不是构造函数”。我已经浏览了 SimpleSchema 文档，并且这个构造函数在那里，我的代码与他们的示例相同。不知道为什么会出现这个错误。

服务器控制台错误

W20180516-23:44:46.314(2)? (STDERR) /Users/anarayan/.meteor/packages/meteor-tool/.1.6.1_1.1rttc72.ip8ui++os.osx.x86_64+web.browser+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:280
W20180516-23:44:46.315(2)? (STDERR)                         throw(ex);
W20180516-23:44:46.315(2)? (STDERR)                         ^
W20180516-23:44:46.316(2)? (STDERR) 
W20180516-23:44:46.316(2)? (STDERR) TypeError: SimpleSchema is not a constructor
W20180516-23:44:46.316(2)? (STDERR)     at Staffs.js (imports/api/Staffs/Staffs.js:20:17)
W20180516-23:44:46.317(2)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:343:9)
W20180516-23:44:46.317(2)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180516-23:44:46.318(2)? (STDERR)     at methods.js (imports/api/Staffs/methods.js:1:193)
W20180516-23:44:46.318(2)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:343:9)
W20180516-23:44:46.318(2)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180516-23:44:46.319(2)? (STDERR)     at api.js (imports/startup/both/api.js:1:67)
W20180516-23:44:46.319(2)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:343:9)
W20180516-23:44:46.319(2)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180516-23:44:46.320(2)? (STDERR)     at index.js (imports/startup/server/index.js:1:50)
W20180516-23:44:46.320(2)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:343:9)
W20180516-23:44:46.320(2)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180516-23:44:46.321(2)? (STDERR)     at main.js (server/main.js:1:14)
W20180516-23:44:46.321(2)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:343:9)
W20180516-23:44:46.321(2)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180516-23:44:46.322(2)? (STDERR)     at /Users/anarayan/project/BusApp/.meteor/local/build/programs/server/app/app.js:7391:1
W20180516-23:44:46.323(2)? (STDERR)     at /Users/anarayan/project/BusApp/.meteor/local/build/programs/server/boot.js:411:36
W20180516-23:44:46.323(2)? (STDERR)     at Array.forEach (<anonymous>)
W20180516-23:44:46.323(2)? (STDERR)     at /Users/anarayan/project/BusApp/.meteor/local/build/programs/server/boot.js:220:19
W20180516-23:44:46.324(2)? (STDERR)     at /Users/anarayan/project/BusApp/.meteor/local/build/programs/server/boot.js:471:5
W20180516-23:44:46.324(2)? (STDERR)     at Function.run (/Users/anarayan/project/BusApp/.meteor/local/build/programs/server/profile.js:510:12)
W20180516-23:44:46.324(2)? (STDERR)     at /Users/anarayan/project/BusApp/.meteor/local/build/programs/server/boot.js:470:11

这是课程

/* eslint-disable consistent-return */

import { Mongo } from 'meteor/mongo';
import { SimpleSchema } from 'simpl-schema';

const Staffs = new Mongo.Collection('staffs');

Staffs.allow({
  insert: () => false,
  update: () => false,
  remove: () => false,
});

Staffs.deny({
  insert: () => true,
  update: () => true,
  remove: () => true,
});

Staffs.schema = new SimpleSchema({
  name: {
    type: String,
    label: 'Staff Name',
  },
  email: {
    type: String,
    label: 'Staff email id',
  },
  mobile: {
    type: String,
    label: 'Staff mobile number',
  },
  status: {
    type: String,
    label: 'Staff Status',
  },
  role: {
    type: String,
    label: 'Role name',
  },
  location: {
    type: String,
    label: 'Location from where staff belongs',
  },
  createdAt: {
    type: String,
    label: 'The date this document was created.',
    autoValue() {
      if (this.isInsert) return (new Date()).toISOString();
    },
  },
  updatedAt: {
    type: String,
    label: 'The date this document was last updated.',
    autoValue() {
      if (this.isInsert || this.isUpdate) return (new Date()).toISOString();
    },
  },
});

Staffs.attachSchema(Staffs.schema);

export default Staffs;

感谢您帮助我。

Answer 1

你需要不带大括号导入包，因为它是公开的as default export:

import SimpleSchema from 'simpl-schema'; 

因此，您甚至可以通过这种方式导入它：

import MyRenamedSchema from 'simpl-schema'; 

然后可以被另一个命名构造函数new MyRenamedSchema调用

资源

文档快速入门：

https://github.com/aldeed/simple-schema-js/blob/master/README.md#quick-start

导出类型：

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/export

Answer 2

为那些来到这里并且已经没有花括号的人添加一个答案。如果您的数据库中已经有数据，似乎也会发生这种情况。

见https://stackoverflow.com/a/52579056/204658

Answer 3

您需要在 .meteor/packages 中添加以下包才能使用 SimpleSchema 构造函数。

aldeed:collection2
aldeed:simple-schema

希望对你有帮助！