How can I reference a document from another database?
This is how I'm connecting to the databases as mentioned in the docs (Docs):
import mongoose from "mongoose";
export default async function connect() {
const usersConn = await mongoose
.createConnection(process.env.USERS_MONGO_URI)
.asPromise(); // Wait for the connection to be created
const videosConn = await mongoose
.createConnection(process.env.VIDEOS_MONGO_URI)
.asPromise(); // Wait for the connection to be created
const User = usersConn.model(
"User",
new mongoose.Schema({
id: {
type: String,
required: true,
},
name: {
type: String,
required: true,
},
email: {
type: String,
required: true,
},
image: {
type: String,
required: true,
},
})
);
const Video = videosConn.model(
"Video",
new mongoose.Schema({
title: {
type: String,
required: true,
},
path: {
type: String,
required: true,
},
author: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
},
})
);
return {
usersClient: usersConn.getClient(), // For next-auth
User,
Video,
};
}
But when I try to populate my query:
const video = await Video.findById(
new mongoose.Types.ObjectId(id as unknown as string)
)
.populate("author")
.exec((err, v) => {
console.log(err, v);
});
It gives me the following error:
MissingSchemaError: Schema hasn't been registered for model "User".
Use mongoose.model(name, schema)
I've been trying to look for this for a long time, but I'm unable to find an answer. The way I solved this, although a bit hacky, is by saving the id in a field called author_id, then searching through the User model for the id when querying.
Related
I have tried so many times to add new field to the existing MongoDB document but I failed. I tried following code to do the job but nothing happened.
Here is the User model.
const UserSchema = new mongoose.Schema(
{
name: {
type: String,
required: true,
},
email: {
type: String,
required: true,
unique: true,
},
password: {
type: String,
required: true,
},
},
{ timestamps: true }
);
Here is the code to add new field to the document.
const updateDocument = async () => {
const updatedUser = await User.findOneAndUpdate(
{ _id: "63eb30f466127f7a0f7a9b32" },
{
$set: { lastName: "syed" },
}
);
console.log(updatedUser);
};
updateDocument();
NOTE 1: lastName field does not exist in the MongoDB document and in the UserSchema. I want to add that field to the MongoDB document.
NOTE 2: The same code works when I update the existing field inside the document but it does not work when adding new field.
You need to pass strict:false as an option to findOneAndUpdate.
According to the mongoose doc:
The strict option, (enabled by default), ensures that values passed to our model constructor that were not specified in our schema do not get saved to the db.
const updatedUser = await User.findOneAndUpdate(
{ _id: "63eb30f466127f7a0f7a9b32" },
{
$set: { lastName: "syed" },
},
{ strict: false }
);
An alternative way is to pass this parameter when you defined the schema:
const UserSchema = new mongoose.Schema(
{
name: {
type: String,
required: true,
},
email: {
type: String,
required: true,
unique: true,
},
password: {
type: String,
required: true,
},
},
{ timestamps: true, strict: false }
);
I am building an app in which the user adds and deletes objects (Pic) in an array('pics') after registering, but not sure how to dynamically load or populate('pics') to userSchema to automatically render. The user registers on the app with that array originally empty ('pics' = zero), and will create or delete those objects thereafter when logged in.
Following the documentation, I used "await User.find().populate('pics');" to migrate data in index method, but did not work.
Besides, should I include 'pics' key at store method, or userSchema 'pics' should be enough?
const userSchema = new mongoose.Schema({
name: {
type: String,
required: true,
trim: true
},
pics: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Pic"
}
],
});
const picSchema = new mongoose.Schema({
thumbnail: String,
description: String,
dev: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
},
);
const User = mongoose.model('User', userSchema);
const Pic = mongoose.model('Pic', picSchema)
async index(req, res, next) {
const users = await User.find().populate('pics');
res.status(200).json(
devs
);
},
async store(req, res) {
try {
const { name } = req.body;
let user = await User.create({
name,
pics
})
// await user.populate('pics').execPopulate();
res.send({ user })
}
} catch (error) {
res.status(400).send(error);
}
},
I worked a time ago with MongoDB and NodeJS. I think that you have a problem with the definitions. Also, you can read the documentation https://mongoosejs.com/docs/populate.html
You need to define the _id for collections (Schema).
const userSchema = new mongoose.Schema({
_id: new mongoose.Types.ObjectId(),
name: {
type: String,
required: true,
trim: true
},
pics: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Pic"
}
],
});
const picSchema = new mongoose.Schema({
_id: new mongoose.Types.ObjectId(),
thumbnail: String,
description: String,
dev: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
},
);
So, when you create a new User, the _id is completed (you can generate it or it can be generated automatically) and ignore the field pics. When you create a Pic, you need to read the _id of the User and assigned as 'dev', something like:
let pic = new Pic({
thumbnail: '', description: '',
dev: yourUser._id
});
Using this way to create documents, you can use the populate function.
Here I am trying to fetch Users Created places using userId. Here are User model and places model and in Controller, I have writing logic to fetch places by userId. Unfortunately, I am getting error "UnhandledPromiseRejectionWarning: TypeError: place.toObject is not a function" during sending response in res.json({ }) method.
Place Model
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const placeSchema = new Schema({
title: { type: String, required: true },
description: { type: String, required: true },
image: { type: String, required: true },
address: { type: String, required: true },
location: {
lat: { type: Number, required: true },
lng: { type: Number, required: true },
},
creator: { type: mongoose.Types.ObjectId, required: true, ref: 'User'}
});
module.exports = mongoose.model('placemodels', placeSchema);
User Model
const mongoose = require('mongoose');
const uniqueValidator = require('mongoose-unique-validator');
const Schema = mongoose.Schema;
const userSchema = new Schema({
name: { type: String, required: true },
email: { type: String, required: true, unique: true },
password: { type: String, required: true, minlength: 6 },
image: { type: String, required: true },
places: [{ type: mongoose.Types.ObjectId, required: true, ref: 'Place'}]
});
userSchema.plugin(uniqueValidator);
module.exports = mongoose.model('usermodels', userSchema);
Controller
const getPlacesByUserId = async (req, res, next) => {
const userId = req.params.uid;
let userWithPlaces;
try {
userWithPlaces = await User.findById(userId).populate('placemodels');
} catch (err) {
console.log(err);
const error = new HttpError(
'Fetching places failed, please try again later',
500
);
return next(error);
}
// if (!places || places.length === 0) {
if (!userWithPlaces || userWithPlaces.places.length === 0) {
return next(
new HttpError('Could not find places for the provided user id.', 404)
);
}
res.json({
places: userWithPlaces.places.map(place =>
place.toObject({ getters: true })
)
});
};
The references are really important in mongoose populate. In the schema, the refs refer to the mongoose name of the schema. Since the names are: 'placemodels' and 'usermodels'. The refs fields should use the exact name.
Reference: https://mongoosejs.com/docs/api.html#schematype_SchemaType-ref
The second important part is the parameters of the populate methods. The documentation specifies that the first argument of the populate function is a name path and is an object or a string. In the case above a string is used. It should refer to the name field to populate.
This means that the code should be the following because we want to populate the places field. The schema is responsible to know from where to get the information
...
userWithPlaces = await User.findById(userId).populate('places');
...
References: https://mongoosejs.com/docs/api.html#query_Query-populate
The references are really important in mongoose populate. In the schema, the refs refer to the mongoose name of the schema. Since the names are: 'placemodels' and 'usermodels'. The refs fields should use the exact name.
Reference: https://mongoosejs.com/docs/api.html#schematype_SchemaType-ref
The second important part is the parameters of the populate methods. The documentation specifies that the first argument of the populate function is a name path and is an object or a string. In the case above a string is used. It should refer to the name field to populate.
This means that the code should be the following because we want to populate the places field. The schema is responsible to know from where to get the information
I have two models
1.PageType Model
module.exports = (mongoose) => {
const pageTypeSchema = new mongoose.Schema({
title: {
type: String,
key: {
type: String,
required: true,
},
}, {
timestamps: { createdAt: 'created_at', updatedAt: 'updated_at' },
});
return mongoose.model('PageType', pageTypeSchema);
};
WorkFlow Model
module.exports = (mongoose) => {
const workFlowSchema = new mongoose.Schema({
title: {
type: String,
default: null,
},
key: {
type: String,
default: null,
},
level: {
type: Number,
required: true,
},
page_type_id: {
type: mongoose.Schema.Types.ObjectId,
ref: 'PageType',
},
}, {
timestamps: { createdAt: 'created_at', updatedAt: 'updated_at' },
});
return mongoose.model('WorkFlow', workFlowSchema);
};
But when I try to use populate it throws Schema hasn't been registered for model PageType
async getFlowById(flowId) {
const result = await this.workFlow.findById(flowId).populate('page_type_id').exec();
return result;
}
Can anyone please help me with this??
In app.js the models are included before routes also PageType model is also declared before WorkFlow model
You typed wrong collection name. Collection name is Workflow and you are trying to findById at workflow. So i think Workflow should be there. Just try with that.
I have a user schema and a post schema, wherein a user has many posts. I would like to return all posts that the user has on a route called '/post/dashboard'.
Here is my schemas:
let UserSchema = new Schema({
username: {
type: String,
required: true,
unique: true,
},
password: {
type: String,
default: null,
},
profile_pic: {
type: String,
default: '/img/profilepic.png',
},
posts: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Post'
}
})
let PostSchema = new Schema({
title: {
type: String,
},
description: {
type: String,
}
original_poster: {
type: Schema.Types.ObjectId,
ref: 'User',
required: true
},
tags: {
type: [String]
}
})
So, for example something like:
app.get('/', (req,res) => {
Post.find({ original_poster: req.session.user }).then((posts) =>{
res.send(JSON.stringify(posts));
}) //where req.session.user is an id (the logged in user's object id or _id)
})
Essentially in sql syntax it might be something like:
SELECT * FROM POSTS WHERE ORIGINAL_POSTER = <req.session.user>
What is the proper way to return all posts by the req.session.user?
It seems that original_poster field represent a reference to User's model, If req.session.user is stored as a string you have to cast it to objectID:
const mongoose = require('mongoose');
...
let userId = mongoose.Types.ObjectId(req.session.user);
Post.find({ original_poster: userId }).then((posts) => {
res.send(JSON.stringify(posts));
});