从Mongoose调用了存储的javascript函数? [英] Called a stored javascript function from Mongoose?

问题描述

我在MongoDB实例中创建了一个存储的javascript函数，该函数对每个集合中的记录数进行计数.如果我进入mongo shell并输入:

I have created a stored javascript function in my MongoDB instance that counts the number of records in each collection. If I go to my mongo shell and type:

> db.eval("getTotals()");

它按预期工作.如果我这样尝试通过mongo调用它:

it works as expected. if I try to call it through mongo like so:

totals = mongoose.connection.db.eval("getTotals()");
console.log(totals);

undefined被记录.有人在这里看到我在做什么错吗?

undefined gets logged. Does anyone see what I am doing wrong here?

推荐答案

大多数猫鼬调用不会像这样以内联方式返回，而是希望传递一个回调来处理结果.

Most mongoose calls do not return in-line like this, but rather expect a callback to be passed in to process the results.

完全未经测试，但您可能想要以下内容:

Completely untested, but you probably want something like:

mongoose.connection.db.eval("getTotals()", function(err, retVal) {
   console.log(retVal)
});

在现实世界中，将结果分配给该范围之外的var或您想要执行的任何操作.

And in the real world, assign your result to a var outside of that scope or whatever you want to do.

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