Node.js NodeJS+;猫鼬:种群不起作用
我想向Node.js NodeJS+;猫鼬:种群不起作用,node.js,mongoose,populate,Node.js,Mongoose,Populate,我想向博客对象添加几个类别对象,然后访问博客的第一个类别 var ObjectId = mongoose.Schema.Types.ObjectId; var categorySchema = mongoose.Schema({ title: String, blogs: [{ type: ObjectId, ref: 'Blog' }] }) var blogSchema = mongoose.Schema({ title: String, descript
博客
对象添加几个类别
对象,然后访问博客的第一个类别
var ObjectId = mongoose.Schema.Types.ObjectId;
var categorySchema = mongoose.Schema({
title: String,
blogs: [{ type: ObjectId, ref: 'Blog' }]
})
var blogSchema = mongoose.Schema({
title: String,
description: String,
category: [{ type: ObjectId, ref: 'Category' }],
created: {type: Number, default: new Date().getTime()}
})
var Category = mongoose.model('Category', categorySchema)
var Blog = mongoose.model('Blog', blogSchema)
exports.addBlog = function (object, callback) {
Blog({
title: object.title,
description: object.description,
category: object.category //array of sting ObjectID's - ['',''] – from multiselect box
}).save(function (err, _) {
Blog
.find({title: _.title})
.populate('category')
.exec(function (err, __) {
if (err) return handleError(err);
console.log('Category is ', __.category[0].title);
})
callback(err, _);
});
}
因此,我得到:
TypeError: Cannot read property '0' of undefined
Mongoose似乎在上一次回调(_;)中找不到对象,但我已经检查了–
。title
是有效的。如何填充它?谢谢。问题是Blog.find()
返回一个数组,我应该使用\uuu[0].category[0]。title
或findOne()查找第一眼:似乎没有定义\uuuuu.category
,因为错误消息说0,这是唯一一个0的地方。@gustavohenke我已经解决了:问题是Blog.find()返回一个数组,我应该使用_[0].category[0]。title或findOne()查找