I'm using mean stack to create a hybrid app.I'm using nosql to create DB in mongoose.My DB consists of two tables one is 'donors' and another one is 'bloodGroup'.
My 'bloodGroup' schema is as follows:
module.exports = function(mongoose) {
var Schema = mongoose.Schema;
/* bloodGroup Schema */
var bloodGroupSchema = new Schema({
name: { type: String, required: true }
});
}
My 'Donor'schema is as follows:
/* Donor Schema */
var DonorSchema = new Schema({
Name: { type: String, required: true },
DOB: { type: Date, required: true, trim: true },
Sex: { type: String },
BloodGroupID: { type: Schema.Types.ObjectId, ref: 'BloodGroup', required: true },
ContactNo: { type: String, required: true },
LocationId: { type: Schema.Types.ObjectId, ref: 'Location', required:true },
EmailId: { type: String, required: true },
Password: { type: String, required: true }
});
When many donors refer to a single blood group then BloodGroup object Id error is reported.How to solve this problem?
You can refer this link for documentation: http://mongoosejs.com/docs/populate.html
Saving Refs
/* Donor Schema */
var DonorSchema = new Schema({
_id : {type: Number},
Name: { type: String, required: true },
DOB: { type: Date, required: true, trim: true },
Sex: { type: String },
BloodGroupID: { type: Schema.Types.ObjectId, ref: 'BloodGroup', required: true },
ContactNo: { type: String, required: true },
LocationId: { type: Schema.Types.ObjectId, ref: 'Location', required:true },
EmailId: { type: String, required: true },
Password: { type: String, required: true }
});
/* bloodGroup Schema */
var bloodGroupSchema = new Schema({
_bid :{ type: Number, ref: 'Donor' },
name: { type: String, required: true }
});
module.exports = mongoose.model('Donor', DonorSchema);
module.exports = mongoose.model('Blood', bloodGroupSchema);
var vidya = new Donor({ _id: 0, name: 'Vidya', sex: 'F' });
vidya.save(function (err) {
if (err) return handleError(err);
var blood = new BloodGroup({
name: 'B+',
_bid: vidya._id // assign the _id from the Donor
});
blood.save(function (err) {
if (err) return handleError(err);
// thats it!
});
});
Mongo is not a Relational database, relation one to many does not exist in mongDB. The question is quite confusing, but following the title, you should either embed the donnors into the BloodGroup, or create an Id field unique to which you will refer and do two queries.
Related
I am using nodejs,mongodb and mongoose. This query is not fetching match data from user and order table. I have read mongoose docs and alot of other articeles. It's according to it but doesn't fetch match data from tables.
Query code:
const data = await order
.find({ admin_id: req.params.id })
.populate("orderRelate");
console.log(data);
My user and order schema code is:
const mongoose = require("mongoose");
const UserSchema = new mongoose.Schema(
{
username: { type: String, required: true, unique: true },
email: { type: String, required: true, unique: true },
password: { type: String, required: true },
mobile_no: { type: Number, required: true },
profilePic: { type: String, defaut: "" },
owner: { type: Boolean, defaut: false },
},
{ timestamps: true }
);
const orderSchema = new mongoose.Schema(
{
customer_id: { type: String, required: true },
admin_id: { type: String, required: true },
order_type: { type: String, defaut: "normal" },
order_status: { type: String, required: true },
order_price: { type: Number, required: true },
order_address: { type: String, required: true },
order_pickDate: { type: String, required: true },
order_pickTime: { type: String, required: true },
orderRelate: [{ type: mongoose.Schema.Types.ObjectId, ref: "User" }],
},
{ timestamps: true }
);
module.exports = mongoose.model("User", UserSchema);
module.exports = mongoose.model("Order", orderSchema);
Please let me know if anyone know why I am facing this issue.
Thanks
Please try with findById maybe it's work
i don't know how you wrote your middleware function but..
await Order.find({orderRelate: req.user.id})
Here is my very basic product schema:
const productSchema = new Schema({
productName: {
type: String,
required: true,
},
productDescription: {
type: String,
},
productPrice: {
type: Number,
},
});
module.exports = mongoose.model("Product", productSchema);
These products are listed out and a user can add a quantity for each. I am storing in an array of objects as per below. I want to join these two collections together so that I can output the qty of products selected by the user. I believe I need to use populate here but not sure how to set up the Refs and so on.
const PartySchema = new Schema({
firstName: {
type: String,
required: true,
},
lastName: {
type: String,
required: true,
},
catering: [{ id: mongoose.Types.ObjectId, qty: Number }],
created_at: {
type: Date,
default: Date.now,
},
});
module.exports = mongoose.model("Party", PartySchema);
I'm sharing this solution with the assumption that the catering field is the sub-document array pointing to the Product Schema:
The Product Schema is fine so it stays the same (although to keep to convention I would advice naming your schema 'Products' instead of 'Product', Mongo Naming Covention):
const productSchema = new Schema({
productName: {
type: String,
required: true,
},
productDescription: {
type: String,
},
productPrice: {
type: Number,
},
});
module.exports = mongoose.model("Products", productSchema);
And next the Party Schema would be:
const PartySchema = new Schema({
firstName: {
type: String,
required: true,
},
lastName: {
type: String,
required: true,
},
catering: [{
id: {
type: mongoose.Types.ObjectId,
ref: 'Products',
},
qty: {
type: Number,
}
}],
created_at: {
type: Date,
default: Date.now,
},
});
module.exports = mongoose.model("Parties", PartySchema);
I just started learning express and mongodb. I recently faced the kind of problem, I'm trying to select all the subdocuments which are inside of Room model.
const books = await Room.find().populate('book');
But it returns whole room document when i want to select only bookings field.
Here's the book schema
const bookSchema = new mongoose.Schema({
startDate: {
type: Date,
required: true,
},
endDate: {
type: Date,
required: true,
},
name: {
type: String,
required: true,
},
phone: {
type: String,
required: true,
},
});
module.exports = mongoose.model("book", bookSchema)
And here's the room schema
const roomSchema = new mongoose.Schema({
currentlyReserved: {
type: Boolean,
default: false,
},
people: {
type: Number,
required: true,
},
roomNumber: {
type: Number,
required: true,
},
pricePerPerson: {
type: Number,
required: true,
},
reservedUntil: {
type: Date,
default: null,
},
reservedBy: {
type: String,
default: null,
},
bookings: {
type: [{ type: mongoose.Schema.Types.ObjectId, ref: "book" }],
},
});
module.exports = mongoose.model("room", roomSchema);
You can project with with second arg to find().
https://docs.mongodb.com/manual/reference/method/db.collection.find/#projection
const books = await Room.find({}, {bookings: 1}).populate('bookings');
Im relatively new to MongoDB and Mongoose. Im much used to MySQL so in used to inner joining tables on calls. Ive read a lot that you can link two Mongoose Schemas to achieve the same outcome. How would like like the two schemas together to when I make a call to get a chore by id it'll return the chore and then for the assignedTo & createdBy have the user scheme data for the said userId?
Chore Schema
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var ChoreSchema = new Schema({
title: {
type: String,
required: true
},
desc: {
type: String,
required: true
},
time: {
type: Number,
required: true
},
reaccurance: {
type: [{
type: String,
enum: ['Daily', 'Weekly', 'Bi-Weekly', 'Monthly']
}]
},
reward: {
type: Number,
required: true
},
retryDeduction: {
type: Number,
required: false
},
createdDate: {
type: Date,
default: Date.now
},
createdBy: {
type: String,
required: true
},
dueDate: {
type: Date,
required: true
},
status: {
type: [{
type: String,
enum: ['new', 'pending', 'rejected', 'completed', 'pastDue']
}],
default: ['new']
},
retryCount: {
type: Number,
default: 0,
required: false
},
rejectedReason: {
type: String,
required: false
},
familyId: {
type: String,
required: true
},
assignedTo: {
type: String,
required: false,
default: ""
}
});
let Chores = module.exports = mongoose.model('Chores', ChoreSchema);
module.exports.get = function (callback, limit) {
Chores.find(callback).limit(limit);
};
User Schema
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var UserSchema = new Schema({
firstName: {
type: String,
required: true
},
lastName: {
type: String,
required: true
},
role: {
type: [{
type: String,
enum: ['Adult', 'Child']
}]
},
birthday: {
type: String,
required: false
},
familyId: {
type: String,
required: true
},
balance: {
type: Number,
required: true,
default: 0.00
}
});
let Users = module.exports = mongoose.model('Users', UserSchema);
module.exports.get = function (callback, limit) {
Users.find(callback).limit(limit);
};
Im trying to link ChoreSchema.createdBy & ChoreScheme.assignedTo by UserSchema._id
How I make the call in Node.js:
exports.index = function(req, res) {
Chore.get(function(err, chore) {
if (err)
res.send(err);
res.json({
message: 'Chore List',
data: chore
});
});
};
Mongoose has a more powerful alternative called populate(),
which lets you reference documents in other collections.
https://mongoosejs.com/docs/populate.html
Here is how you can link ChoreSchema.createdBy and ChoreScheme.assignedTo by UserSchema._id
var mongoose = require('mongoose');
const { Schema, Types } = mongoose;
var UserSchema = new Schema({
firstName: { type: String, required: true },
...
})
var ChoreSchema = new Schema({
title: { type: String, required: true },
...
//The ref option is what tells Mongoose which model to use during population
assignedTo: { type: Types.ObjectId, ref: 'Users' },
createdBy: { type: Types.ObjectId, ref: 'Users' },
})
let Chores = mongoose.model('Chores', ChoreSchema);
let Users = mongoose.model('Users', UserSchema);
Then in your express route handler you can populate assignedTo & createdBy like this
router.get('/chores/:id', function (req, res) {
const choreId = req.params.id;
Chores.find({ _id: choreId })
.populate('createdBy') // populate createdBy
.populate('assignedTo') // populate assignedTo
.exec(function (err, chore) {
if(err) {
return res.send(err)
}
res.json({ message: 'Chore List', data: chore });
});
})
I have three documents as below:
var TrackAudioSchema = new Schema({
track_id: {
type: Number,
},
track_path:{
type:String,
required:'Please upload audio track'
}
});
mongoose.model('TrackAudio', TrackAudioSchema);
var trackSchema = new Schema({
title: {
type: String,
trim:true,
required:'Please fill track title'
},
version : {
type: String,
trim: true,
default: ''
},
trackpath:{
type: Schema.ObjectId,
ref: 'TrackAudio'
},
});
var AlbumSchema = new Schema({
language: {
type: String,
default: '',
trim: true
},
tracks:[trackSchema],
user: {
type: Schema.ObjectId,
ref: 'User'
},
)};
AlbumSchema.plugin(deepPopulate);
mongoose.model('Album', AlbumSchema);
but when I try to populate trackpath from trackSchema using the below query, it doesn't populate:
Album.findById(albumId)
.populate('user','name label').
deepPopulate('tracks.trackpath').
exec(function(err, albumdetail) {
}
Please help.
You're missing:
mongoose.model('Track', TrackSchema);