Question

我在Mongo有一个名为Programs的集合，其中一个文档看起来像这样（我在Meteor中）：

{ id: "gMyxyez43sxya",
 .
 .
 Teachers: { 
             Week1: { Sunday: "SAM", Monday: "GEORGE" },
             Week2: { Sunday: "FIONA", Monday: "JEFFERS" }
           },
 CampYear: "ssipc16",
 }

我需要"Week1", "Week2"属性作为变量。变量在这里计算：

var week = "Week" + Session.get('CurrentWeek').substr(0, 1); //this would render 'Week1', for example
var teacher = document.getElementById('sunday').value;

我需要的查询是：

Programs.find({ "Teachers.week.Sunday": teachers });

但这不起作用。所以我构建了这样的对象：

var query = { Teachers: {} };
query.Teachers[week].Sunday = teacher;

然后：

Programs.find(query).count();

但我收到类型错误'Uncaught TypeError: Cannot set property 'Sunday' of undefined'。

我也尝试过这样：

query.Teachers[week] = { 'Sunday': teacher };
Programs.find(query).count();

没有错误但每次都在计算0的计数。

如何使这项工作？

Answer 1

我找到了解决方案：我需要像这样构建它：

var teacher = document.getElementById('sunday-lessons-students').value;
var week = "Week" + Session.get('CurrentWeek').substr(0, 1);
var query = {};
query['Teachers.' + week + '.Sunday'] = teacher;
console.log(Programs.find(query).count());

使用查询时在Mongo中设置属性名称中的变量时出错

1 个答案: