I have two Schemas:
var ProgramSchema = new Schema({
active: Boolean,
name: String,
...
});
var UserSchema = new Schema({
username: String,
email: { type: String, lowercase: true },
...
partnerships: [{
program: { type: Schema.Types.ObjectId, ref: 'Program' },
status: { type: Number, default: 0 },
log: [{
status: { type: Number },
time: { type: Date, default: Date.now() },
comment: { type: String },
user: { type: Schema.Types.ObjectId, ref: 'User' }
}]
}]
});
Now I want to get all Program docs, but also append 'status' to each doc, to return if the program is already in a partnership with the logged in user.
My solution looks like this:
Program.find({active: true}, 'name owner image user.payments', function (err, p) {
if(err) { return handleError(res, err); }
})
.sort({_id: -1})
.exec(function(err, programs){
if(err) { return handleError(res, err); }
programs = _.map(programs, function(program){
var partner = _.find(req.user.partnerships, { program: program._id });
var status = 0;
if(partner){
status = partner.status;
}
program['partnership'] = status;
return program;
});
res.json(200, programs);
});
The req.user object contains all information about the logged in user, including the partnerships array.
To get this solution to work, I have to append
partnership: Schema.Types.Mixed
to the ProgramSchema.
This looks a bit messy and thats why I am asking for help. What do you think?
When you want to freely modify the result of a Mongoose query, add lean() to the query chain so that the docs (programs in this case) are plain JavaScript objects instead of Mongoose doc instances.
Program.find({active: true}, 'name owner image user.payments')
.lean() // <= Here
.sort({_id: -1})
.exec(function(err, programs){ ...
Then you can remove partnership from your schema definition. Your query will also execute faster.
Related
I have 2 mongo schemas related one with the other using ObjectId:
var User = new Schema({
username: {
type:String,
unique: true
},
password: {
type:String
},
verified: {
type: Boolean,
default: false
},
lastActivity:{
type:Date,
default:Date.now
}
});
And a watitingRoom schema with lists all the users:
var WaitingRoom = new Schema({
lastActivity:{
type:Date,
default:Date.now
},
clients: [{
type : mongoose.Schema.ObjectId,
ref: 'User'
}],
videocalls: [{
type: mongoose.Schema.ObjectId,
ref:'VideoCall'
}]
});
So, I want to 'refresh' my clients array pulling all the clients which a lastActivity less than the current time. I tried it by using the $pull tool present in mongoose. After googling and mixing different examples I tried things like:
WaitingRoom.findOneAndUpdate({}, { lastActivity: new Date(),
$pull : {clients : {"clients.lastActivity": { $lt: new Date() }}}
}, options)
.populate("clients")
.exec( function(error, waitingRoom) {
if (err) { return res.status(500).send({ msg: err.message }); }
})
Which finds the unique waiting room, updates the lastActivity field and tries to pull all the clients that has a clients.lastActivity less than the current date.
(Obviously this snipped code doesn't work)
The problem is that I didn't find any documentation or example that explains if it is possible to pull elements from a referred ObjectId schema using a nested condition clients.lastActivity
You need to first find the ids from User database and then need to $pull them from the WaitingRoom database
User.find({ lastActivity: new Date() }).then((users) => {
const ids = []
users.map((user) => {
ids.push(user._id)
})
WaitingRoom.update({}, { $pull: { clients: ids }}, { multi: true }).then(() => {
console.log('removed')
})
})
I have a Torrent item, it has subdocument array named '_replies' to saved user comments, and every comment also include subdocument array '_replies' to saved user reply, this is my all schema define:
var CommentSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'User'
},
comment: {
type: String,
default: '',
trim: true
},
_replies: [this],
createdat: {
type: Date,
default: Date.now
},
editedby: {
type: String,
default: '',
trim: true
},
editedat: {
type: Date,
default: ''
}
});
var TorrentSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'User'
},
torrent_filename: {
type: String,
default: '',
trim: true,
required: 'filename cannot be blank'
},
torrent_title: {
type: String,
default: '',
trim: true,
required: 'title cannot be blank'
},
_replies: [CommentSchema]
});
mongoose.model('Torrent', TorrentSchema);
mongoose.model('Comment', CommentSchema);
the first level comment of torrent update/delete fine, the code of server controller likes below:
exports.update = function (req, res) {
var torrent = req.torrent;
torrent._replies.forEach(function (r) {
if (r._id.equals(req.params.commentId)) {
r.comment = req.body.comment;
r.editedat = Date.now();
r.editedby = req.user.displayName;
torrent.save(function (err) {
if (err) {
return res.status(422).send({
message: errorHandler.getErrorMessage(err)
});
} else {
res.json(torrent); //return data is Correct, and save to mongo is Correct
}
});
}
});
};
but when i used Alike function to update/delete _replies._replies, it can return Correct json of torrent to response, Unfortunate, the save to mongo not fine, the code:
exports.SubUpdate = function (req, res) {
var torrent = req.torrent;
torrent._replies.forEach(function (r) {
if (r._id.equals(req.params.commentId)) {
r._replies.forEach(function (s) {
if (s._id.equals(req.params.subCommentId)) {
s.comment = req.body.comment;
s.editedat = Date.now();
s.editedby = req.user.displayName;
torrent.save(function (err) {
if (err) {
return res.status(422).send({
message: errorHandler.getErrorMessage(err)
});
} else {
res.json(torrent);//return data is Correct, but save to mongo is incorrect
}
});
}
});
}
});
};
also, i can delete first level comment, but can not delete second level comment reply, all the json data of torrent is correct, only not save to mongo.
what can i do more?
I already solve it, i add this code before .save().
torrent.markModified('_replies');
it work fine!
I am not a totally new populate user but now I do not know what's wrong.
Here I need to populate my designerId which is type of ObjectId. Take a look at my route.
ordersAdminRouter.route('/customorder/add')
.post(function(req, res){
body = req.body;
console.log(body);
CustomOrders.create(body, function(err, saved){
if (err) throw err;
Designs.findByIdAndUpdate(saved.designId, {$set: {status: 'Order Sent'}}, {new: true}).exec()
.then(function(updated){
return CustomOrders.findById(saved._id).populate(saved.designId).exec();
})
.then(function(orders){
res.json(orders);
})
.then(undefined, function(err){
console.log(err);
})
});
});
saved._id is working because when I remove the populate, it returns the document that I need without the populated document of course.
Take a look at my schema
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var customOrderSchema = new Schema({
designId: { type: Schema.Types.ObjectId, ref: 'customDesigns' },
size: { type: String },
quantity: { type: Number },
totalPrice: { type: Number },
paymentMode: { type: String },
rcpt_img: { type: String },
refNumber: { type: String }
});
module.exports = mongoose.model('customOrders', customOrderSchema);
Here is my customDesigns schema.
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var customDesignSchema = new Schema({
item_name: { type: String },
price: { type: Number, default: 0 },
img_url_front: { type: String },
img_url_back: { type: String },
designer: { type: Schema.Types.ObjectId, ref: 'users' },
color: { type: String },
designDate: { type: Date, default: Date.now() },
status: { type: String, default: 'For Qoutation' }
});
module.exports = mongoose.model('customDesigns', customDesignSchema);
I need to admit that I am new to promises on mongoose & express and this is my first time doing so. But using populate, i use it more than I can think of. Any suggestions?
return CustomOrders.findById(saved._id).populate('designId').then(.. your code);
By the way, you dont must use .exec() then you want execute your query, .then executes query as well. You can skip .exec()
http://mongoosejs.com/docs/populate.html
http://mongoosejs.com/docs/api.html#query_Query-populate
I am somewhat new to this, so if I am on the completely wrong track feel free to let me know.
I have the following post schema.
var Post = new Schema( {
description: {
type: String,
default: '',
required: 'Please type a description',
trim: true
},
likeCount: {
type: Number,
default: 0
},
url: {
type: String,
default: '',
required: 'Unable to find photo',
trim: true
},
created: {
type: Date,
default: Date.now
},
user: {
type: Schema.ObjectId,
ref: 'User',
required: 'Unable to verify user'
},
comments: {
type: [Comment]
},
//Dynamically added values
hasLiked: {
type: Boolean
}
});
And the following Like schema
var Like = new Schema({
created: {
type: Date,
default: Date.now
},
user: {
type: Schema.ObjectId,
ref: 'User'
},
post: {
type: Schema.ObjectId,
ref: 'Post'
}
});
When I show a user a list of posts I need to indicate whether they have previously "liked" a post, so I am trying to pull the posts, then iterate through them to determine if the person has liked it and update the value in the Post. I'm not getting any errors, but it's also not updating the hasLiked value. I put the hasLiked value into my Mongoose model because I can't just add a value on the fly before returning my results. I don't store an actual value for that in the DB because it would obviously be different for every person that viewed the post.
exports.list = function(req, res) {
Post.find().sort('-created').populate('user', 'displayName')
.exec(function (err, posts) {
if (err) {
return res.status(400).send({
message: errorHandler.getErrorMessage(err)
});
} else {
for (var i = 0; i < posts.length; i++) {
Like.find({ 'post': posts[i]._id, 'user': req.user.id }).exec(function (err, like) {
if (err) {
return res.status(400).send({
message: errorHandler.getErrorMessage(err)
});
} else {
if (like.length == 0)
posts[i].hasLiked = false;
else
posts[i].hasLiked = true;
}
});
}
res.jsonp(posts);
}
});
};
Node is async language. So your mistake here is that when you query to find if the user liked the post:
Like.find({ 'post': posts[i]._id, 'user': req.user.id }).exec(function (err, like)
the answer will return after you return the answer to the client. In other words, line res.jsonp(posts); performed before the answer from mongo returned and enters to the callback. Thats why it isn't working for you.
To handle with async methods, I suggest you to use a third-party library, such as async or q.
Here is one solution for you with Q library:
var Q = require('q');
var promises = [];
posts.forEach(function(post) {
promise = Q(Like.find({ 'post': post._id, 'user': req.user.id }).exec())
.then(
function(like) {
if (like.length == 0)
post.hasLiked = false;
else
post.hasLiked = true;
}
}
,function(err) {
//handle error
});
})
Q.all(promises)
.then(function() {
return res.jsonp(posts);
});
I have a model called Shop whos schema looks like this:
'use strict';
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var ShopSchema = new Schema({
name: { type: String, required: true },
address: { type: String, required: true },
description: String,
stock: { type: Number, default: 100 },
latitude: { type: Number, required: true },
longitude: { type: Number, required: true },
image: String,
link: String,
tags: [{ type: Schema.ObjectId, ref: 'Tag' }],
createdAt: { type: Date, default: Date.now },
updatedAt: { type: Date, default: Date.now }
});
module.exports = mongoose.model('Shop', ShopSchema);
I want to use the array tags to reference to another model via ObjectId obviously. This set up works fine when I add ids into the property via db.shops.update({...}, {$set: {tags: ...}}) and the ids get set properly. But when I try to do it via the Express.js controller assigned to the model, nothing gets updated and there even is no error message. Here is update function in the controller:
// Updates an existing shop in the DB.
exports.update = function(req, res) {
if(req.body._id) { delete req.body._id; }
Shop.findById(req.params.id, function (err, shop) {
if (err) { return handleError(res, err); }
if(!shop) { return res.send(404); }
var updated = _.merge(shop, req.body);
shop.updatedAt = new Date();
updated.save(function (err) {
if (err) { return handleError(res, err); }
return res.json(200, shop);
});
});
};
This works perfect for any other properties of the Shop model but just not for the tags. I also tried to set the type of the tags to string, but that didn't help.
I guess I am missing something about saving arrays in Mongoose?
It looks like the issue is _.merge() cannot handle merging arrays properly, which is the tags array in your case. A workaround would be adding explicit assignment of tags array after the merge, if it is ok to overwrite the existing tags.
var updated = _.merge(shop, req.body);
if (req.body.tags) {
updated.tags = req.body.tags;
}
Hope this helps.. If the workaround is not sufficient you may visit lodash forums.