限制流星中从mongodb返回的字段数 [英] Limit number of field return from mongodb in Meteor

问题描述

我有一个存储文档的集合，其中包含电子邮件、电话号码等用户信息.

I am have a collection that stores documents that contains user informations like Email, Phone Number, etc.

例如，我希望能够仅返回文档中存在的 5 个字段.

I want to be able to return only 5 fields that exist in the document, for example.

电子邮件:[[e-mail], [e-mail]]

Email: [[e-mail], [e-mail]]

手机:[012345, 6789]

Mobile: [012345, 6789]

国家:美国

服务:[批发、零售]

邮编:30001

城市:纽约

它会返回:

[e-mail]，012345，美国，批发，30001

[e-mail], 012345, USA, Wholesale, 30001

或者如果文档是

服务:[批发、零售]

邮编:30001

城市:纽约

它会返回:

批发，30001，纽约

Wholesale, 30001, New York

基本上限制返回的字段数为5个字段，如果该字段是数组，则只返回该数组中的第一项.

Basically limits the number of fields to return to 5 fields, and if that field is an array, then only return first item in that array.

我的英语不是很好，但我已尽力解释我的问题，如果有任何部分不清楚，我很乐意尝试进一步解释.

My english is not that good but I have tried my best to explain my problem, if any part is unclear I'd be happy to try to explain further.

非常感谢任何帮助.

即使我可以对把手/空格键而不是光标施加这种限制，也没关系.什么都行~

It would be fine even if I could impose this kind of limit on handlebars/spacebars instead of cursor. Whatever works~

推荐答案

这个想法是将你的收藏转移到另一个(结果)数组中，并在你的把手模板中检索这个数组:

The idea is to transfer your collection in another ( result ) array, and to retrieve this array in your handlebar template :

Users  = new Meteor.Collection("users"); 
LIMIT =4;

Template.userShow.users = function () {
    var users = Users.find().fetch();
    for (var i = 0; i < LIMIT; i++) {
        result[i] =  users[i];  
    }
    return result ;
};

这篇关于限制流星中从mongodb返回的字段数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！