Mongoose是一个Node.js的对象模型工具,用于在应用程序中操作MongoDB数据库。在Mongoose中,可以使用find()和populate()方法来执行查询和关联查询。 1. fin...
注:官方说明:In Mongoose >= 4.0, you can manually populate a field as well. //官方例子 Story. findOne({ title:/casino royale/i }). populate('author', 'name').//only return the Persons nameexec(function(err, story) {if(err)returnhandleError(err); console.log('The author is %s', ...
AI代码解释 // 引入自定义的数据库连接文件varmongoose=require('./db.js');varUserSchema=newmongoose.Schema({username:{type:String,unique:true},password:String,name:String,age:Number,sex:String,tel:Number,status:{type:Number,default:1}});module.exports=mongoose.model('User',UserSchema,'user');...
mongoose具备关系数据库一样的关联查询,通过在schema模型中设置ref属性,然后在查询时使用populate关键字,可以达到关联查询的目的。 以下内容参考了mongoose官方文档http://mongoosejs.com/docs/2.7.x/docs/populate.html,代码也由该文档而来。 先上代码: //schema var mongoose = require('mongoose'); var mydb =mo...
Schema = mongoose.Schema; var UserSchema = new Schema({ username: { type: String, required: true, index: { unique: true } }, is_admin: {type: Boolean, required: true, default: false } }); save - id hardcoded for example app.post('/api/new_story', function(req, res){ ...
mongoose.connect('mongodb://localhost/population-test', function (err){ if (err) throw err; createData(); }); function createData() { var userIds = [new ObjectId, new ObjectId, new ObjectId]; var postIds = [new ObjectId, new ObjectId, new ObjectId]; ...
mongoose Well, there aren't docs for this in the Mongoose website; what I do is something like this: schema.statics.createQuery = function( populates ) { var query = this.find(); populates.forEach(function( p ) { query.populate( p ); ...
Using the function import{reversePopulate}from"mongoose-promise-reverse-populate";// The next step requires access to the 'Author' and 'Post' mongoose modelconstauthors=awaitAuthor.find();constoptions={modelArray:authors,storeWhere:"posts",arrayPop:true,mongooseModel:Post,idField:"author",};const...
'Post' }]});const postSchema = Schema({ owner: { type: Schema.Types.ObjectId, ref: 'User' }, title: String, content: String,});const User = mongoose.model('User', userSchema);const Post = mongoose.model('Post', postSchema);const userIds = [];async function seed() { await Use...
exec(function(error, author){// `comments.author.posts` now contains an array of all posts that the// comment's author wrote}); Moving On The virtual populate API is an exciting addition to mongoose that enables you to design your schemas in an idiomatic way rather than design around the...