Looking for MongoDB schema suggestions - mongodb

Question

I'm relatively new to MongoDB and I'm wondering what the "best" solution would be for handling the following type of data in my database.
Collections:
Users
Lessons
Overview:
Note: Think of the implementation to be similiar to Duolingo or some other learning site.
Users have all the standard generic user information but they also need to track how many points, words learned, percentage complete, and so on, that they have for each given lesson they've started.
Lessons have data like: words learned, total points, words to review, etc.
Picture
Example of what a user would see in the widget when they view a lesson they've already started...
So what's a good way to handle this? I feel that I will need at a minimum a collection for users and lessons, but where would I store that user specific data relating to lessons they've taken?
What I've thought of so far ...
// user collection
const UserSchema = new mongoose.Schema({
email: { type: String, required: true, unique: true },
username: { type: String, required: true, unique: true },
password: { type: String, required: true },
firstName: { type: String },
lastName: { type: String },
gender: { type: String, enum: ['male', 'female', 'other'] },
admin: Boolean,
address: {
street: String,
city: String,
state: {
type: String,
uppercase: true,
required: true,
enum: statesArray,
},
zip: Number,
},
});
// lesson_results collection
const LessonResultsSchema = new mongoose.Schema({
user_id: Schema.Types.ObjectId,
results: [
{
id: Number,
lesson_id: Schema.Types.ObjectId,
pointsEarned: Number,
wordsLearned: Number,
wordsToPractice: [
{
id: Number,
correct: Number,
incorrect: Number,
bookmarked: Boolean,
},
],
},
],
});
// lesson collection
const LessonSchema = new mongoose.Schema({
title: String,
description: String,
totalPoints: Number,
totalWords: Number,
words: [
{
id: Number,
word: String,
points: Number
}
]
})
// if logged in
// find user in user collection
// find user's results in lessonsResults collection by using user_id
// iterate over each result to find their lesson & lesson's data
// combine data and send to frontend
// calculate percentage complete + other calculations
// render aggregate data on screen
I'm curious how you would resolve this.
Apologies if it's a bit long-winded! (+ hopefully the examples make sense)

Answer 1

You need to have the reference of user in LessonSchema, so that you can track how many lessons are taken by a user.
const LessonSchema = new mongoose.Schema({
user:{type:mongoose.Schema.Types.ObjectId,ref:'UserSchema',required:true},
title: String,
description: String,
totalPoints: Number,
totalWords: Number,
words: [
{
id: Number,
word: String,
points: Number
}
]
})
And you need to maintain a FLAG in LessonResultsSchema to track whether a user has completed that lesson or not. Once the lesson gets completed, you need to update the pointsEarned so that you can have the updated points data.
const LessonResultsSchema = new mongoose.Schema({
user_id: Schema.Types.ObjectId,
completed:{type:Boolean, default:0},
results: [
{
id: Number,
lesson_id: Schema.Types.ObjectId,
pointsEarned: Number,
wordsLearned: Number,
wordsToPractice: [
{
id: Number,
correct: Number,
incorrect: Number,
bookmarked: Boolean,
},
],
},
],
});