mongoose-populate

问题 I am studying the Populate Virtuals: https://mongoosejs.com/docs/populate.html#populate-virtuals require("./connection"); // //---------------------------------------------------- const mongoose = require("mongoose"); const Schema = mongoose.Schema; const PersonSchema = new Schema({ name: String, band: String }); const BandSchema = new Schema({ name: String }); BandSchema.virtual("members", { ref: "Person", // The model to use localField: "name", // Find people where `localField` foreignField

问题 I'm trying to get a particular user's posts. It's returning me an empty array of posts. Here's my code. I think I have referenced everything correctly, there must be some mistake. User model const Schema = mongoose.Schema const userSchema = new Schema({ username: { type: String, required: true }, email: { type: String, reuired: true }, password: { type: String, required: true }, posts:[{ type: Schema.Types.ObjectId, ref: "Post" }] }, { timestamps: true }) Post model const Schema = mongoose

问题 I can see the populated value in the console but when trying to access it I'm getting undefined : const AccountProfile = new Schema({ owner: { type: String }, firstName: { type: String }, lastName: { type: String }, countryId: { type: mongoose.Schema.Types.ObjectId, ref: "Country" } }); const Country = new Schema({ name: String }); AccountProfile.statics.getProfile = function (username, cb) { this.model("AccountProfile").findOne({owner: username}) .populate("countryId") .exec(function (err,

问题 I have two models. The first one is UserSchema and the second one is CategorySchema var UserSchema = Schema({ firstName: { type: String, required: true }, secondName: String, lastName: { type: String, required: true }, email: { type: String, unique: true, required: true }, password: { type: String, required: true }, status: { type: String, required: true }, roles: [{ type: Schema.ObjectId, ref: 'Role' }], publications: [{ title: { type: String, }, description: String, status: { type: String,

问题 Campaign data is storing except user reference in MongoDB campaign collection. How do I render only campaigns that were created by the user but not all campaigns by every user? I need this after the user logged in to website. Campaign schema var mongoose = require('mongoose'); var Schema = mongoose.Schema; var campaignSchema = new Schema({ Title: {type: String}, Description: { type: String }, Rules: {} , Banner: { type: String }, user: { type: mongoose.Schema.Types.ObjectId, ref: 'User' } });

问题 Setup Let's say we have schemas for Foo and Bar . Foo has a field bar . This field can either contain an ObjectId that reference a document Bar , or it could contain other arbitrary objects that are not ObjectIds. const fooSchema = new mongoose.Schema({ bar: { type: mongoose.Schema.Types.Mixed, ref: 'Bar' } }); const Foo = <any>mongoose.model<any>('Foo', fooSchema); const barSchema = new mongoose.Schema({ name: String }); const Bar = <any>mongoose.model<any>('Bar', barSchema); Problem Now

问题 here is my schema: var UserSchema = new Schema({ email: String, name: String, city: String, username: String, profilePic: String, phoneNo: Number, shortList: { project: [{ type: Schema.ObjectId, ref: "Project" }], flat: [{ type: Schema.ObjectId, ref: "Flat" }], }, }); var FlatSchema = new Schema({ project: { type: Schema.ObjectId, ref: "Project" }, status: String, floor: Number, size: String, type: String, flat_number: String, price: Number, flooringType: String, createdAt: { type: Date,

问题 I came across the following line of code which I couldn't understand ,although there are lot of tutorials that gives information related to examples of populate but there is none that explains what exactly it means.Here is a example var mongoose = require('mongoose'), Schema = mongoose.Schema var PersonSchema = new Schema({ name : String, age : Number, stories : [{ type: Schema.ObjectId, ref: 'Story' }] }); var StorySchema = new Schema({ _creator : { type: Schema.ObjectId, ref: 'Person' },

问题 Can you populate an array in a mongoose schema with references to a few different schema options? To clarify the question a bit, say I have the following schemas: var scenarioSchema = Schema({ _id : Number, name : String, guns : [] }); var ak47 = Schema({ _id : Number //Bunch of AK specific parameters }); var m16 = Schema({ _id : Number //Bunch of M16 specific parameters }); Can I populate the guns array with a bunch of ak47 OR m16? Can I put BOTH in the same guns array? Or does it require a

问题 I am building a fairly simple application on the MEAN stack and I am really out of my depth, especially when it comes to mongoose. I have found the mongoose documentation very difficult to wrap my head around and cannot find answers anywhere else. My issue is this: I have a bunch of users, these users have repositories and the repositories have repository providers (GitHub, BitBucket etc). A user has many repositories and a repository has one repository type. My user file contains the