模板助手中的异常：TypeError：无法读取未定义的属性“profile” [英] Exception in template helper: TypeError: Cannot read property 'profile' of undefined

问题描述

现在我在遇到此错误之前遇到了类似的问题：

Now I had a similar problem before where I was getting this error:

模板助手中的异常：TypeError：无法读取属性
'profile'of undefined

Exception in template helper: TypeError: Cannot read property 'profile' of undefined

同样的事情再次发生，但在第二个订单上，其中包含另一个用户个人资料信息（第一个配置文件已定义）。
我如何让它在{{#each orders}}中重新呈现？

The same thing is happening again but on the second order, which contains another users profile information (the first profile is defined). How would I get it to re-render in {{#each orders}}?

看来info.firstName，lastName和building得到了由于某种原因，当只有2个订单时被调用3次...

It also appears that info.firstName, lastName, and building gets called 3 times for some reason when there are only 2 orders...

在HTML中：

<template name="orderItem">
  <section>
    <form role="form" id="ordersList">
      <div>
        {{#each orders}}
          <input type="text" name="name" value="{{info.firstName}} {{info.lastName}}">
        {{/each}}
      </div>
      <div>
        {{#each orders}}
          <input type="text" name="building" value={{info.building}}>
        {{/each}}
      </div>
      <div>
        {{#each orders}}
          <input type="text" name="featuredDish" value={{featuredDish}}>
        {{/each}}
      </div>
    </form>
  </section>
</template>

在javascript中：

In javascript:

Template.orderItem.orders = function() {
  var todaysDate = new Date();
  return Orders.find({dateOrdered: {"$gte": todaysDate}});
};

Template.orderItem.info = function() {
  var userId = this.userId;
  var user = Meteor.users.findOne(userId)
  var firstName = user.profile.firstName;
  var lastName = user.profile.lastName;
  var building = user.profile.building;

  return {
    firstName: firstName,
    lastName: lastName,
    building: building
  }
};

感谢帮助！

推荐答案

此错误是常见问题。
您正在尝试访问未定义的用户对象。
函数 info 不检查 user 是否是正确的对象。使用名为守卫的技术：

This error is common issue. You are trying to access user object which is undefined. Function info doesn't check if user is correct object. Use technique called guarding :

Template.orderItem.info = function() {
  var userId = this.userId;
  var user = Meteor.users.findOne(userId)

  var firstName = user && user.profile && user.profile.firstName;
  var lastName = user && user.profile  && user.profile.lastName;
  var building = user && user.profile  && user.profile.building;

  return {
    firstName: firstName,
    lastName: lastName,
    building: building
  }
};

即使用户 undefined，上述代码也不会抛出任何错误。

我假设你已经删除了 autopublish 包。
可能你没有发布/订阅 Meteor.users 集合，所以没有数据可以在minimongo中找到。

I assume that you have removed autopublish package. Probably you haven't published/subscribed from/to Meteor.users collection, so there is no data to find in minimongo.

请记住发布 Meteor.users 集合并订阅它：

Remember to publish Meteor.users collection and subscribe to it:

Meteor.publish("users", function(){
  return Meteor.users.find({},{fields:{profile:1}})
})

Meteor.subscribe("users");

为Meteor.users发布某些信息，并为Meteor.user发布更多信息

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