I am just learning Mongoose and NodeJS. Attempting my own project after finishing a tutorial.
I have two Models: "Flat" (containing flat numbers) and "User" (users owning the Flats).
var flatsSchema = new mongoose.Schema({
flat: String,
users:[{
userId: String,
username: String,
userType: String //owner or tenant
}]
});
var Flat = new mongoose.model("Flat", flatsSchema);
var userSchema = new mongoose.Schema({
username: String,
flatsRegistered: [{
flat: String,
userType: String //owner or tenant
}]
});
var User = new mongoose.model("User", userSchema);
A User may own multiple Flats, and in each Flat, there can be multiple users.
In the "Flat" model, I have the users living in each flat in the "users" property. I also have flats owned by the users in the flatsRegistered property of "User" model.
Now when a user logs in to his webpage - I want to pass all the details of the flats he is registered to - with all the other users in those flats.
I tried the
flatsRegistered.foreach((userFlat) => {
Flat.findOne({ flat: userFlat }, function (err, flatFound) {
if (!err) {
console.log(flatFound.users) //assign flatFound.users to a variable which i pass to webpage using ejs
}
});
}
Trouble is the foreach loop completes before the Flat.findOne can complete. Is there any way to force Flat.findOne to complete before foreach can continue? After reading up things, I am discovering concepts of async/await and promise - but I really don't know how to use those (and even if they are applicable). Please help.
Just use for of with await like this:
for (const userFlat of flatsRegistered) {
const flatFound = await Flat.findOne({ flat: userFlat });
console.log(flatFound.users) //assign flatFound.users to a variable which i pass to webpage using ejs
}
Related
How can I do to pass the id of a document from outside and not that mongoose generates it?
I need the objects to be stored with the id I tell them, but mongoose overwrites it and saves it with the one he wants. I tried several ways now and nothing happens.
It is an entity that I am distributing through events in several databases, so I need it to be stored with the id I want to maintain the integrity of the data.
Now I have this and it says "document must have an _id before saving", but the id I have already put it, does not recognize it.
The scheme is like this:
const schema = new Schema({
_id: { type: String },
name : { type: String },
});
I also tried with this, and the error is the same:
const schema = new Schema({
_id: { type : String },
name : { type: String },
},
{
_id: false
});
I am passing the object like this:
Item.create({ _id: 'my uuid here', name: 'something' });
but when it is saved it remains with the id generated by mongoose replacing mine, that is, it changes it to me with a _id: '5twt563e3j5i34knrwnt43w'
Your syntax should work, but sometimes mongoose acts weird.
You can try this syntax (works on my project) :
const item = new Item({ name: 'something' });
item._id = 'my uuid here';
await item.save();
Instead of using a random uuid, you need to use a mongoDB objectID. Mongoose can also create that,
var mongoose = require('mongoose');
var id = mongoose.Types.ObjectId();
Store this id in the collection,
Item.create({ _id: id, name: 'something' });
Given a situation where you have a User Scheme that you use to create a base model called User. And then for user roles, you use mongoose discriminators to create inherited models called Admin, Employee and Client. Is there a way to programmatically determine how many discriminations/inheritances/roles of the User model are available, as well as the available names?
My question in terms of code:
File: models/user.js
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var options = {discriminatorKey: 'role'};
var userSchema = mongoose.Schema({
name: String,
email: String,
password: String,
},options);
var User = mongoose.model('User', userSchema);
var Client = User.discriminator("Client", mongoose.Schema({
Address : String,
Tax_identification : String,
Phone_number : String,
Internal_Remarks : String,
CRM_status : String,
Recent_contact : String,
}));
var Employee = User.discriminator("Employee",mongoose.Schema({
Staff_Id: String,
}));
module.exports = {User: User, Client: Client, Employee: Employee };
File: controllers/usersController.js
var User = require('../models/user.js').User;
module.exports = {
registerRoutes: function(app){
app.get('user/create',this.userCreateCallback)
},
userCreateCallback: function(req,res){
//Get Available User Roles - The function below doesn't exist,
//Just what I hypothetically want to achieve:
User.geAvailableDiscriminators(function(err,roles){
res.render('user/create',{roles:roles})
});
}
};
I hope I managed to express what I want to do. Alternative approaches are also welcome.
Since v4.11.13, mongoose model has model.discriminators which is an array of models, keyed on the name of the discriminator model.
In your case if you do console.log(User.discriminators) you will get:
{
Client: {
....
},
Employee: {
}
}
As far as I can see, this is not documented anywhere.
Line 158 in lib.helpers.model.discriminators.js is where this is created.
I think you want to fetch the names and values of all the discriminators as for the names you can simply use
User.discriminators
but for finding values you can use this
return Promise.all(Object.keys(discriminators).map(i =>
discriminators[i].find({ userId: this._id }))
).then(promiseResults =>
promiseResults.reduce((arr, el) => arr.concat(el), [])
);
you need to put userId under each discriminators for that.
I originally have these two schemas:
var UserSchema = new Schema({
first: String,
last: String
});
var SaleSchema = new Schema({
createdAt: Date,
registeredBy: { type: Schema.ObjectId, ref: 'User' }
});
But I want to edit my SaleSchema to save the user name instead of the ID, so I changed it for:
var SaleSchema = new Schema({
createdAt: Date,
registeredBy: String
});
Next, I wanted to edit all the Sales documents and replace the user IDs on registeredBy for the user's full name, but I can't seem to be able to perform a find query for the old ID's.
Long story short, this query returns no matches on mongoose, but it works perfectly using the mongo console:
Mongoose
Sale.find({ registeredBy: '57ea0cbb47431f0b43b87d42' })
.then(results => res.json(results))
.catch(err => res.status(500).json(err));
// result: []
MongoDB console
db.sales.find({ registeredBy: '57ea0cbb47431f0b43b87d42' })
// result: 8 elements
After I modify my schema's property back to ObjectId, the mongoose query works again. Since I need to migrate to a new datatype, I want to be able to query and store both types of values. Is this possible?
Good question this is a complicated edge case. I am not super familiar with Mongoose specifically, but one way to do this would be to migrate your data at a lower level. For example, create a mongo script that uses the low-level mongo API to do the migration, something along the lines of:
db.sales.find().forEach(function(doc){
var user = db.users.find({ _id: doc.registeredBy });
db.sales.update({ _id: doc._id, }, {
$set: { registeredBy: user.first + ' ' + user.last }
});
});
This is similar to what a module like https://github.com/balmasi/migrate-mongoose does, but I've personally found it easier to use mongo scripts on the cli directly.
mongo < sale-schema-migration.js
Allora, I'm using mongoose for the first time and I decided to create 2 schemes: the first one represents a user and the second one represents his enquires. Users have an array of enquires like:
var userSchema = new mongoose.Schema({
name: String,
enquires: { type : [Enquire.schema] , "default" : [] },
});
var enquireSchema = new mongoose.Schema({
status: {type: String, 'default': 'pending'},
enquire: String,
});
I see that if I search for an enquire and update its status, it doesn't update the same enquire on the user's array, meaning that they are different object. I don't want to save an array of IDs as it will be the same as a relational database, so I see only 1 solution which is forgetting about the enquire scheme and use only the User scheme. Is it the way mongoose works? For every relationship do I have to insert everything like nested object?
I think you should use references to achieve what you want to achieve.
For more information on mongoose references and populate see Mongoose Populate documentation.
Try this, It may help you.
User Schema :
var userSchema = new mongoose.Schema({
name: String,
enquires: [{ type : mongoose.Schema.Types.ObjectId , ref : 'Enquiry' }]//array of enquiries
});
var User = mongoose.model('User',userSchema );
module.exports = User;
Enquiry Schema :
var enquireSchema = new mongoose.Schema({
status: {type: String, 'default': 'pending'},
enquire: String,
});
var Enquiry = mongoose.model('Enquiry',enquireSchema );
module.exports = Enquiry ;
Working :
create a new Enquiry.
Push it's ID(_id) into user's enquires array.
var enquiry = new Enquiry();
enquiry.enquire = "Dummy enquiry";//set the enquiry
enquiry.save(function(err,result){
if(!err){
//push 'result._id' into users enquires array
}
});
whenever you update an enquiry, it will be automatically updated in
user's document.
use populate to retrieve user's enquiries.
You can embed sub documents (entity) which has id and is like a document or embed native array like a normal property.
And I think the correct definition for yours is :
var enquireSchema = new mongoose.Schema({
status: {type: String, 'default': 'pending'},
enquire: String,
});
var userSchema = new mongoose.Schema({
name: String,
enquires: { type : [enquireSchema] , "default" : [] },
});
If you use refs in embedded link then there are two separate collections and be like relational db's.
I am new to node.js coming from java experience. I have a situation that I am trying to wrap my head around. My stack is express.js, mongoose, ejs template. Here is my scenario:
I have a schema:
var UserSchema = mongoose.Schema({
name: {
type: String,
index: true
},
password: {
type: String,
select: false
},
email: {
type: String
},
academic: [{
qualification: String,
institute: String,
from: String,
to: String,
about: String
}]
});
there is a list of academics. I want to update only one academic object in that list. How would I go about this?
router.post('/academic/schools/update', function (req, res) {
});
I pass the values from ejs template into the route and getting the values in the req.body. How would I in node and mongoose query that specific object in the route and then updates its values. I have thought about maybe adding an Id to the academic object to be able to keep track of which to update.
Each academic sub document will have an _id after you save.
There are two ways you can do it. If you pass the id of the user and id of the academic sub-doc id in the url or request body, then you can update like this:
User.findById(userId).then(user => {
let academic = user.academic.id(academicId);
academic.qualification = 'something';
return user.save();
});
If you only pass the id of the academic sub-doc, then you can do it like this:
User.findOne({'academic._id': academicId}).then(user => {
let academic = user.academic.id(academicId);
academic.qualification = 'something';
return user.save();
});
Note that sub document array return from mongoose are mongoosearray instead of the native array data type. So you can manipulate them using .id .push .pop .remove method http://mongoosejs.com/docs/subdocs.html