assuming i have this 2 schemas
company schema with an array of categories
//category
export const CategorySchema = new mongoose.Schema({
name: { type: String },
}, { timestamps: true });
//company
export const CompanySchema = new mongoose.Schema({
user: { type: Schema.Types.ObjectId, ref: 'User' },
name:String,
email:String,
categories:{type: [CategorySchema], default: [] },
}, { timestamps: true });
product schema with category as a ref to the category from company
export const ProductSchema =new mongoose.Schema({
name:String,
category:{ type: Schema.Types.ObjectId, ref: 'Category' },
}, { timestamps: true })
is it possible to populate category from the product ?
i tried this code and it's not working
const products=await this.productModel.find({}).populate({'path':"category","model":"Category"}) ``
what you need is just
productModel.find({}).populate("category")
try this code for populate
const products=await this.productModel.find({}).populate({'path':"category","model":"company.categories"})
Related
I have created two models where I am trying to ref one model to another but it's not working and I don't have any idea about it I used it exactly the same way as in the mongoose example but it is not helping, the only difference between my working and their example is I have two different files for both models and I am exporting them to use in another file
The example I took reference from Mongoose
First Model
const userModel = require('./userModel')
const {Schema} = mongoose
const tweet = new Schema({
date: {
type: Date,
required: true,
},
msg:{
type: String,
maxlength:140,
required:true
},
tweetid:{
type: mongoose.Types.ObjectId
}
})
const tweetSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'userModel'
},
tweets: {
type: [{tweet}],
default: []
}
})
const tweetModel = mongoose.model('tweet',tweetSchema)
module.exports = tweetModel
Second Model
const {Schema} = mongoose
const userSchema = new Schema({
email: {
type:String,
required: true,
unique: true,
trim:true
},
password: {
type:String,
required: true,
trim:true
},
follows: {
type: [String],
default: []
}
})
const userModel = mongoose.model("User",userSchema)
module.exports = userModel
Your reference string should be equal to the model name that you have passed to mongoose.model:
const tweetSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'User'
},
tweets: {
type: [{tweet}],
default: []
}
})
How can I populate category in courses model?
I have courses, courses will have category from categories->subcategories model.
I don't know how to populate from nested objects.
Reference model is category, I have to populate from array subcategories!
**courses:**
const CourseSchema = new mongoose.Schema({
userId: {
type: mongoose.Schema.Types.ObjectId,
ref: 'users'
},
name: {
type: String
},
description: {
type: String
},
category: {
type: mongoose.Schema.Types.ObjectId,
ref: 'category'
}
});
**category:**
const mongoose = require("mongoose");
const CategorySchema = new mongoose.Schema({
userId: {
type: mongoose.Schema.Types.ObjectId,
ref: 'users'
},
name: {
type: String,
required: true
},
subcategories: [{
name: {
type: String
}
}]
});
const Category = mongoose.model('category', CategorySchema);
module.exports = Category;
use seprate collection for subCetagory like:
**courses**
const CourseSchema = new mongoose.Schema({
userId: {
type: mongoose.Schema.Types.ObjectId,
ref: 'users'
},
name: {
type: String
},
description: {
type: String
},
category: {
type: mongoose.Schema.Types.ObjectId,
ref: 'SubCategory'
}
});
**SubCategory:**
const mongoose = require("mongoose");
const SubCategorySchema = new mongoose.Schema({
name: {
type: String,
required: true
},
categorie: {
type: String,
ref: "category"
}
});
const SubCategory = mongoose.model('category', SubCategorySchema);
module.exports = SubCategory;
**Category**
const mongoose = require("mongoose");
const CategorySchema = new mongoose.Schema({
userId: {
type: mongoose.Schema.Types.ObjectId,
ref: 'users'
},
name: {
type: String,
required: true
},
subcategories: [
{
type: Schema.types.objectId,
ref: "SubCategory"
}
]
});
then just add subcetagory id to course when insert new course or update a course and when you want to get course along with subcetagory and category use populate query of mongoose
currently i created a schema for storing products using mongoose as below
const Schema = mongoose.Schema;
const ProductSchema = new Schema({
title: {
type: String,
required: true
},
price: {
type: Number,
required: true
},
description: {
type: String,
required: true
},
quantity: {
type: Number,
required: true
},
manufacture: {
type: String,
required: true
},
creator: {
type: Schema.Types.ObjectId,
ref: 'user'
},
category: {
type: Schema.Types.ObjectId,
ref: 'category'
}
});
module.exports = { Product: mongoose.model('product', ProductSchema) };
and here another schema for storing categories that products are related to
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const CategorySchema = new Schema({
title: {
type: String,
required: true
}
});
module.exports = { Category: mongoose.model('category', CategorySchema) };
each product is related to a category
the question is how can i display all products that are related to a specific category.
i tried .find() method but i can't use it correctly.
thanks for any advice
You need to use .populate('category'), after .find() in order to populate all the connected data.
products.find().populate('category').exec((err, product) => { })
I'm trying to embed a model in a mongoose schema. Here's what I have:
const People = {
userId: {
type: mongoose.Schema.Types.objectId,
required: true,
ref: 'User'
},
locationId: {
type: mongoose.Schema.Types.objectId,
required: true,
ref: 'Location'
},
};
const Person = mongoose.model(
'Person',
new mongoose.Schema({
...People,
gender: {
type: String
}
})
);
const shmanian = await new Person({gender: 'other', userId:'someUserId', locationId: 'someLocationId'}).save();
The response I get is {gender: 'other'}
The problem is that people doesn't get populated when I create Person.
You should embed an array of "Person" inside a model "People". For example,
const Schema = require("mongoose").Schema;
const model = require("mongoose").model;
const Person = new Schema({
userId: {
type: mongoose.Schema.Types.objectId,
required: true,
ref: 'User'
},
locationId: {
type: mongoose.Schema.Types.objectId,
required: true,
ref: 'Location'
},
});
const People = new Schema({
person: [Person]
});
module.exports = model("People", People);
Here, everytime you create a new Person, you can add it to the People model which contains an array of Person objects.
Not a mongoose Problem.
People is undefined when you create the Object Person.
Thus it doesn't get populated.
Try switching both assignments.
Hello im trying to join these collections i want to get all users which has "active" attribute equal to false. I couldn't figure out how to acquire this query. There are my schemas:
User Schema
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const UserSchema = new Schema({
name: {
type: String,
required: true
},
email: {
type: String,
required: true
},
password: {
type: String,
required: true
},
type: {
type: String,
required: true
},
active:{
type:Boolean
}
});
module.exports = mongoose.model('users', UserSchema);
Company Schema:
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const CompanySchema = new Schema({
userId: {
type: mongoose.Schema.Types.ObjectId,
ref: 'users'
},
companies: [{
name: {
type:String
},
country:{
type:String
}
}
]
});
module.exports = Company = mongoose.model('company', CompanySchema);
Note: Not all users have companies only the type "client" and i want to get both, "client" and "employe"
You may want to refactor your Schema to better accommodate the type of data you have available.
For example:
User Schema:
const UserSchema = new Schema({
name: {
type: String,
required: true
},
email: {
type: String,
required: true
},
password: {
type: String,
required: true
},
type: {
type: String,
required: true
},
active:{
type:Boolean
},
companies: [{
type: mongoose.Schema.Types.ObjectId,
ref: 'company'
}]
});
And Company Schema:
const CompanySchema = new Schema({
name: {
type:String
},
country:{
type:String
}
});
Then to get a list of all users who are active, and automatically populate any company data for those users (Assuming your user model is called UserModel)
UserModel.find({ active: false }).populate('companies').exec();
If you are unable to edit your data structure for any reason, then you could perform a query similar to:
CompanyModel.aggregate([
{ $lookup: { from: 'users', localField: 'userId', foreignField: '_id', as: 'user' } },
{ $match: { '$user.active': false } }
]).exec()
This will perform an aggregate lookup on the UserId field and then only match on ones where the active property is set to false.