What is wrong with my Mongoose Relationship? - node.js

Question

I am learning mongoose relationship and stuck in this problem... someone tell me where am I wrong..? and Is there a better approach of doing this..?
Employee.js
const mongoose = require("mongoose");
const { departmentSchema, addDepartment } = require("./Departments");
const schema = new mongoose.Schema();
const employeeModel = mongoose.model("Employee", {
Name: { type: String, required: true, minlength: 5, maxlength: 50 },
Department: departmentSchema
});
async function addEmployee(Employee, Department, Language, Framework) {
const result = await new employeeModel({
...Employee,
Department: addDepartment(Department, Language, Framework)
});
return await result.save();
}
Department.js
const mongoose = require("mongoose");
const { languageSchema, addLanguage } = require("./Language");
const departmentSchema = new mongoose.Schema({
Depart: { type: String, required: true, minlength: 5, maxlength: 50 },
Languages: languageSchema
});
const DepartmentModel = mongoose.model("Department", departmentSchema);
async function addDepartment(Department, Language, Framework) {
const result = await new DepartmentModel({
...Department,
Languages: addLanguage(Language, Framework)
});
return await result.save();
}
module.exports = {
departmentSchema,
addDepartment
};
Language.js
const mongoose = require("mongoose");
const { frameworkSchema, addFramework } = require("./Frameworks");
const languageSchema = new mongoose.Schema({
Language: { type: String, required: true },
Framework: [frameworkSchema]
});
const languageModel = mongoose.model("Language", languageSchema);
async function addLanguage(Language, Framework) {
const result = await new languageModel({
...Language,
Framework: addFramework(Framework)
});
return await result.save();
}
module.exports = {
languageSchema: languageSchema,
addLanguage
};
Framework.js
const mongoose = require("mongoose");
const frameworkSchema = new mongoose.Schema({
Name: { type: String, required: true, minlength: 4, maxlength: 50 },
Version: { type: String, required: true, minlength: 1, maxlength: 50 }
});
const frameworkModel = mongoose.model("Framework", frameworkSchema);
async function addFramework(Framework) {
const result = await new frameworkModel(...Framework);
return await result.save();
}
module.exports = {
frameworkSchema,
addFramework
};
Error from Framework.js
Found non-callable ##iterator
what I am trying to do is
Employee ->
Name
Department ->
Depart
Language ->
Language Name
Framework ->
Framework Name
Framework Version
Every -> represents a new object (collection)
I know it's a little bit complex for a newbie like me...
I am a MySql database user and I loved it but now I am trying to grasp NoSql...
Thanks in advance :)

Answer 1

I will show you an example:
Suppose you have employSchema already like that:
const {Schema} = mongoose;
const employeeModel = mongoose.model("Employee", new Schema({
Name: { type: String, required: true, minlength: 5, maxlength: 50 },
Department: {type: Schema.Types.ObjectId, ref: "Department"}
}));
In the above model, I use ref property to connect to Department model through ObjectId (it mean "_id" property in Department collection).
Ex: You will create an new employeeModel like that:
let newEmployee = new employeeModel("Employee Name", Department ID here).
You absolutely do the opposite or do for others.
And you need to use .populate() function to query database.
Example:
employModel.find({}).populate("Department").exec(callback what you want to do);
You can read official document at: https://mongoosejs.com/docs/populate.html

Answer 2

Solved the error as always :p
The error is because of the spread operator (...) in Framework.js
const result = await new frameworkModel(...Framework);
still if someone can tell me a better approach of doing this, it will be highly appreciated.
Thanks everyone.