使用简单模式和反应时出现未定义的集合错误(流星应用程序)

undefined collection error when using simple schema and react (meteor app)

我正在使用 meteor 1.4 并作出反应以创建一个 poll/vote 网站并在集合中使用了简单的架构。但是当我在 React 组件中订阅我的集合时,我在 chrome 控制台中收到此错误:Uncaught TypeError: Cannot read 属性 'find' of undefined.

这是合集文件:

import { Mongo } from 'meteor/mongo';
import {SimpleSchema} from 'meteor/aldeed:simple-schema';

const Polls = new Mongo.Collection('polls');
Polls.schema = new SimpleSchema({
   createdAt: {
    type: Date,
    autoValue: function() {
        return new Date()
    }
},
question: {
    type: String
},
answers: {
  type: [String]
},
ownerId: {
    type: String,
    autoValue: function() {
        return this.userId
    }
},
votes: {
    type: [Number]
}
});



Meteor.methods({
'poll.new': function() {
    return Polls.insert({});
},

'poll.remove': function(poll) {
    return Polls.remove(poll);
},

'poll.update': function(poll, question, answers) {
    // db.users.update({"username": "tom"}, {"$set": {"documents": []}})
    return Polls.update(poll._id, { $set: { question }}, { $push: {answers: { $each: answers }} });
},

'poll.vote': function(poll, vote) {
    return Polls.update(poll._id, {$push: { vote } });
}
});

export default Polls;

这是反应组件:

import React, { Component } from 'react';
import { createContainer } from 'meteor/react-meteor-data';
import { Link } from 'react-router';
import { Polls } from '../../../imports/collections/polls';

class PollsList extends Component {
  render() {
      return (
          <div>
           {this.props.polls.map(poll => {
                const { question } = poll;
                <Link to= {`/polls/vote/${poll._id}`} key={ poll._id }> {       question } </Link>
               })}
          </div>
       );
    }
 }

export default createContainer(() => {
     Meteor.subscribe('polls');
     return { polls: Polls.find({}).fetch() };
 }, PollsList);

这是服务器内部的发布代码:

import { Meteor } from 'meteor/meteor';
import { Polls } from '../imports/collections/polls';

Meteor.startup(() => {
Meteor.publish('polls', function() {
  return Polls.find({});
});

Meteor.publish('myPolls', function() {
  return Polls.find({ownerId: this.userId});
});
});

因为我的 cmd 中没有任何错误,所以我无法弄清楚这里的问题是什么。

如果此错误未出现在服务器上,请专注于在此行中首次亮相您在 React 组件上的代码

return { polls: Polls.find({}).fetch() };

好像民意调查未定义,也检查民意调查导入的路径

import { Polls } from '../../../imports/collections/polls';

希望对您有所帮助。