virtual - Can't get Mongoose virtuals to be part of the result object

Question

bI'm declaring a virtual that I want to appear as part of the results of its schema's queries, but it's not showing up when I do a console.log on the object. Here's the schema:

var schema = new mongoose.Schema(
{
    Name: { type: String }
},
{
    toObject: { virtuals: true }
});

schema.virtual("Greet").get(function()
{
    return "My name is " + this.Name;
});

Should that toObject not set the virtual as a property of the results of any queries? It does not, nor does schema.set("toObject", { virtuals: true }). Am I doing this right?

Answer 1

因为您JSON.stringify在console.log调用中使用，所以调用toJSON模型实例上的方法，而不是toObject.

所以要么JSON.stringify在你的电话中省略：

console.log(results[0]);

或者toJSON像您当前设置选项一样在架构上设置toObject选项。

...
{
    toObject: { virtuals: true },
    toJSON: { virtuals: true }
});

Answer 2

我的错误是没有在查询中包含所需的字段。如果没有在投影中选择它们，那么 mongoose 不知道如何组合/计算虚拟场。

Answer 3

我最终在这里做了一些非常愚蠢的事情。我使用的是Doc.find代替，Doc.findOne所以我试图访问文档数组而不是文档本身上的虚拟。