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Some Notes Before You Begin

Make sure you follow all of the steps in "Setting Up Your Development Environment" before attempting to even look at the code.

Also, read through the docs linked under the "Contributing to the Codebase" section so you can get a feel for the tools and syntax we will be going through.

Setting Up Your Development Environment

Before you begin, create a folder for this team wherever you want to store any GitHub repos that you will be cloning on your device in this cohort. You can name it include, platform_team, or literally anything you want to. If you choose to name it "include", do not use a '#' in your folder name, it'll cause a bunch of problems later.

1. NODE.JS

Node.js is a runtime environment that is used to run Javascript code. It comes with the Node Package Manager (npm) that helps us manage the Javascript packages used in our project. To set up node.js:

  1. Download the Node.js installer for your OS from https://nodejs.org/en/download/current

  2. Run the installer and follow the installation wizard.

  3. Once the installation finishes, open a terminal on VSCode and type node --version to verify your node installation. Type npm --v to verify your npm installation.

    a. If you get an error saying that node or npm is not recognized as a command, try restarting VSCode to see if the issue fixes itself. (If you had VSCode opened while installing Node, this should fix it.) b. If the problem persists, search for Environment variables in your Start menu. Click on Edit your Environment variables. Click on Environment Variables in the new window that opens up. c. Find the variable Path and click on Edit. d. Check for C:\Program Files\nodejs\ in the list of paths that appear. If it's not there, click on New and add it to the list. e. Restart VSCode and it should ideally work now.

If you already have node
Try to update your node version to roughly v21.1.0 so you don't get random warnings.

2. ESLINT EXTENSION

ESLint is an extension that ensures that your code adheres to certain code style. It also auto-formats your code on save in VSCode. To enable it:

  1. Go to the Extensions tab on VSCode and install ESLint.

  2. Once it is installed, open your Command Palette by pressing Ctrl + SHift + P/Command + Shift + P and search for Preferences: Open Workspace Settings (JSON). Open the file and add this code into the file. This will autoformat your code on save and also configure tab sizes:

     {
     "editor.codeActionsOnSave": {
         "source.fixAll.eslint": "explicit"
     },
     "eslint.validate": [
         "javascript",
         "typescript",
     ],
     "[javascriptreact]": {
         "editor.indentSize": 2
     },
     "[javascript]": {
         "editor.indentSize": 2
     },
     "[typescriptreact]": {
         "editor.indentSize": 2
     },
     "[typescript]": {
         "editor.indentSize": 2
     },
     "[jsonc]": {
         "editor.indentSize": 2
     },
     "typescript.tsdk": "node_modules/typescript/lib",
     "typescript.updateImportsOnFileMove.enabled": "never",
 }

3. Optional Extension

  • Auto Rename Tag — useful for JSX

4. MongoDB

4.1 Installation

To get MongoDB set up locally, you'll need to install MongoDB on your machine along with mongosh (the command line tool for MongoDB). Then, you'll also need MongoDBCompass to view your database with a new interface. The goal is to have mongosh working, once that works, other parts of the tutorial are optional.

4.2 Database and User setup

Inside MongoDB Compass, connect to the client and create a new database using the plus sign near the Database part of the sidebar menu. For collections, just name it anything since it will be deleted later.

You will also need to create a user that has a username, password, and dbOwnership role using the mongo shell (mongosh). To enter your mongo shell, type mongosh into your terminal. To switch to your newly created database:

use <DBNAME>

Replace <DBNAME> with the actual name of your database. (remove the angle brackets, they're just there for me to show that this is replaceable)

Then, to create a user that has ownership of the database:

db.createUser({
   user: "<USERNAME>",
   pwd: "<PASSWORD>",
   roles: ['dbOwner']
})

4.3 Connecting with the Codebase

If that worked, then you should be ready to connect using the codebase! To do so, create a file called .env in the root of the repository (same level as package.json) and input the following:

MONGO_USERNAME=<USERNAME>
MONGO_PASSWORD=<PASSWORD>
MONGO_DB_HOST=127.0.0.1:27017/<DBNAME>

Replace <USERNAME>, <PASSWORD>, <DBNAME> with the actual username, password, and database names. (Don't include the angle brackets).

4.4 Testing & Initialization

Do this after the getting started portion (right after this section)

Assuming you have already run npm install and npm run dev is producing a web page for you to view, you can continue with this part. You will be running the npm run init command which will wipe your database and initialize it with a pokemon and trainers collection. In the future, you can edit this initialization in the _utils/db/dbInit.js file. If this works, then your MongoDB Compass (after a refresh) should display that your database has these two collections. This means everything is working!

Getting Started

Set up:

npm install for package installations. This will install all packages specified in the package.json file.

Run the development server:

npm run dev

Run a linting test:

npm run lint

Contributing to the Codebase

React Resources

HTML/CSS Resources

App Router

Next.js versions 13+ implemented the App Router which allows for colocation of files. With the Page Router, we used to define pages directly by creating a jsx file with the page name inside of a pages directory.

Now, with App Router, we define pages by creating a directory within the app folder where a route is defined only when there is a page.jsx file inside of the directory. To create a new route, you will create a folder, for example: about-us and create a page.jsx file inside. Once you populate the page.jsx file with a React Component, the route http://[domain]/about-us should exist.

To create directories that are guarenteed to never produce a new route in your app, prefix the directory name with _, for example: _components. You can achieve the same thing by just naming it components and ensuring that no page.jsx file ever appears in the directory, however, I want to keep things explicit so we will stick with the underscore.

To create groupings of files without affecting the routes, you can wrap your folder name with parenthesis: (index-page). In our codebase, I have done this to seperate the front and backend by creating a grouping for (api) and (pages). Notice how (api) or (pages) never appears in our route when we navigate through the app. I have done this to (index-page) to group our page information for the route at / inside a folder rather than having it linger in the root of our (pages) directory.

Resources

Layouts

Next.js 13+ also added in the super useful tool called layouts. Layouts essentially wrap around your pages to provide the same "layout" to each page that the layout applies to. An example is having a Navbar and Footer that are shared by every page of the app. Rather than defining the Navbar and Footer in each page, you can add it to the root layout and have the layout apply to each page by writing the code once.

Layouts are defined with a layout.jsx file and the layout applies to:

  • the page in the directory of the layout file
  • all other pages that are descendents of the directory that layout.jsx is in.

Layouts also stack on top of each other. You could have a root layout that puts a navbar on the top of the page and another layout in the /examples route that puts a sidebar on anything examples related. This means when you navigate to /examples or /examples/some-example, you will see both a navbar and a sidebar. However, other routes like /about-us will only have a navbar since this route is only affected by the root layout.

Since we have a layout.jsx in the root of the (pages) directory, all of our frontend is affected by this file.

Resources

File Structure

To keep a maintainable codebase, we will be following strict rules that allow us to keep our codebase organized and clean. In the root of (pages), you will notice that we have three folders:

  • _components
  • _data
  • _hooks
  • _contexts

These three folders should account for every type of file you'll ever need to create. In each subdirectory, for example, about-us, we can also have these four folders.

Lets say I want to create the Navbar component. I will first think about which parts of the codebase the navbar is used by. Since the Navbar is a part of every page and called by the root layout, it makes sense to define the Navbar inside the _components folder of the root folder.

If I want to define a Sidebar that is only used by the examples route, and children of the examples route, then it makes sense to put the Sidebar component inside the _components folder of the examples directory. In short, find the level of nesting that accounts for all use cases for your component, data, utils, hooks and define your code in that level.

Note: The layout.tsx file in the root of (pages) sort of breaks the pattern I was talking about. It was supposed to be in the (index-page) directory since that handles all of the / routes, but a nuance of using the parenthesis to create route groupings forces us to put the layout.jsx on layer above. This won't be an issue for other pages however, so just put the layout.tsx with the page.tsx file whenever you plan on making a layout for certain routes.

Public Folder

The public folder is where we can store media such as pdfs, images, videos. To keep this organized, create a new folder for each page the content is related to. To access content in the public folder, you don't need to do any of the ../../public stuff to access these. Next.js automatically routes / to the public folder.

For example, if you have an image stored in /public/about-us/toki.png, you can access it with /about-us/toki.png from anywhere in your code.

SCSS Modules

We will be using SCSS since it just provides more options for how to format our CSS code. If you don't want to learn SCSS, it's fine, since CSS works just as well in scss files. Also, we will be using css modules for our Next.js app. CSS Modules (in our case SCSS modules) are defined like so: Navbar.module.scss. The reason we are using modules is because they localize our CSS classes so there is no possibility of 2 people using the same class name and having conflict.

Resources

Serverless Functions

To create your API from serverless functions, go to the (api) folder which contains a file structure similar to the (pages) folder. Instead of having _components and _hooks, the (api) folder only has the _utils folder which will be used to define global utility functions. I defined three folders: db, request, and response. These are designed such that all database related utility functions are defined in db, request processing related functions will be in request, and response related utility such as custom Errors are defined in reponse.

If you see a case where some utility only applies to a certain set of endpoints, feel free to create local _utils folders using the same logic as before for local _components and _hooks.

You'll see that there are folders defined with square brackets around the name such as [id]. These are dynamic routes and they work on the frontend as well.

Resources

MongoDB

MongoDB is our database and in order to use it to create an easy to use REST API, I defined a couple of helper functions that you may use for your projects. Before I get into those, I'll link a few resources for you to read up on for CRUD with MongoDB. To be honest, these may not be the best resources, but they are a place to start.

Take looks at embeddings, relations, crud, and aggregations please. Like always, if you are reading through docs and find terms you don't know, look them up so you can truly understand what's going on. If you do this for long enough, you'll build up an internal database of knowledge that carries into future projects, thus saving time!

resources

Database Migrations

We'll be using migrate-mongo for database migrations. You can take a look at some documentation here: https://www.npmjs.com/package/migrate-mongo?activeTab=readme. You can view the migrations in the _migrations folder.

Database migrations should be performed whenever you want to change the schema. Since MongoDB documents are generally unstructured, changing the schema can involve as little as just adding/deleting a field from a single document, or as much as changing an entire collection's JSON schema validation.

You can create a migration by running migrate-mongo create <MIGRATION NAME> at the root of the project (where migrate-mongo-config.js is located). This will create a new migration file in the _migrations folder, which you'll add the up and down migrations to. We'll be using the async-await method described in the documentation, since it's common for migrations to require multiple database calls. I've provided some examples in the examples folder. You can see we're using collMod, which you can read about here: https://www.mongodb.com/docs/manual/reference/command/collMod/. Unfortunately, you'll have to manually copy over any changes you make in the _schema folder into the migration you'd like to perform, since it would be very difficult to parse the schema and automatically generate migrations.

You can see any pending migrations with migrate-mongo status. Once you're done, run the migration with migrate-mongo up, which will run every pending migration sequentially. If you want need to roll back a migration, run migrate-mongo down. This will roll back the last migration.

Databse Seeding

In order to seed the database with mock data, you can run npm run seed, which will prompt you with some questions about how you would like to seed.

If you've just made a new collection, you'll need to look at the generateData.mjs file in _utils/mongodb, where you can add your collection with the relevant data generation.

Helper Functions

By now, I hope you have an understanding of the general syntax of CRUD operations. The main priority of writing the API is to keep the API simple to use. A secondary concern is making the logic behind the scenes (inside the serverless functions) easy to write as well. To solve both issues, I created some helper functions that mainly serve to manipulate JSON objects.

To see how these helper functions were written, refer to the definitions within the _utils/response folder. If there are any bugs, please let me know ASAP so I can fix them, or even better, fix them and make a pull request.

getQueries(request: NextRequest)

getQueries is a helper function that I made to take request queries like http://localhost:3000/api/trainers?<queries> and converts them into a JSON object. This allows you to directly feed the query into some of mongoDB's query inputs.

isBodyEmpty(obj: Object)

Just a simple way to check if a JSON object is empty {}. If our request body is empty, we should throw a NoContentError.

prependAllAttributes(obj: Object, prefix, String)

prependAllAttributes takes a JSON object and renames all fields that are two levels deep by adding the prefix to their names.

Example Input:

{
   "$set": {
      "name": "austin",
      "age": 20
   },
   "$push": {
      "classes": ["physics", "chem"]
   }
}

Example Output where prefix = PREFIX:

{
   "$set": {
      "PREFIXname": "austin",
      "PREFIXage": 20
   },
   "$push": {
      "PREFIXclasses": ["physics", "chem"]
   }
}

This function is mainly used when you have embeddings, such as pokemon embedded within a trainer object. When you update a pokemon from the pokemon collection, you also have to update all copies of that pokemon that is stored in an embedding inside trainer objects. In order to access subdocuments within an object, you often have to refer to fields with dot . notation or array [] notation as prefixes to the actual field name.

parseAndReplace(obj: Object)

This function recursively searches through a JSON object for certain keywords: "*convertIds", "*convertId", "*expandIds", "*expandId". Note: remember to add in the * or else the function won't recognize the keywords. After finding objects with one of these keywords as fields, it will replace the entire object with the return value of a specified operation.

Example full input:

{
   "name": "ash",
   "age": 20,
   "pokemon": {
      "*expandIds": {
        "ids": ["65915e9052657d4814a173c4", "65915e9f52657d4814a173c7"],
        "from": "pokemon"
      }
   }
}

Example output:

{
   "name": "ash",
   "age": 20,
   "pokemon": [
       {
           "_id": "65915e9052657d4814a173c4",
           "name": "vaporeon",
           "happiness": 100
       },
       {
           "_id": "65915e9f52657d4814a173c7",
           "name": "squirtle",
           "happiness": 100
       }
   ]
}

Before the API call is made, by calling parseAndReplace() on the incoming object, we could first convert the raw ObjectIds into pokemon documents to pass into our trainer object. If we didn't do this, the best we could input to our trainer creation command would be the raw ids.

*convertIds:
convertIds takes in a list of raw ObjectId strings and typecasts them into ObjectIds. This is useful since the caller of the api can only pass in ObjectIds as strings, but they need to be casted to ObjecctIds. Rather than manually defining these typeCasts within each serverless function, we can define the typeCasting within the API call itself.

Everytime an object appears like so, it will be replaced with a list of ObjectIds.
Before:

{
   "*convertIds": {
     "ids": ["658f94018dac260ae7b17fce", "658f940e8dac260ae7b17fd0"],
   }
}

After:

[ObjectId("658f94018dac260ae7b17fce"), ObjectId("658f940e8dac260ae7b17fd0")]

There is also *convertId
Before:

{
   "*convertId": {
     "id": "658f94018dac260ae7b17fce",
   }
}

After:

ObjectId("658f94018dac260ae7b17fce")

*expandIds:
expandIds takes in a list of raw ObjectId strings and transforms it into a list of documents queried from a collection. This is extremely useful when you have embeddings. Let's say you are trying to create a trainer and want to assign it some pokemon. You plan on embedding the pokemon data within the trainer. Unless you have access to the entire pokemon objects, you (as the user) would have to first query the pokemon and then pass them into the call to create a trainer. Instead, you can just write that logic with this simple JSON object here to make the API call simpler for the user.
Before:

{
   "*expandIds": {
     "ids": ["65915e9052657d4814a173c4", "65915e9f52657d4814a173c7"],
     "from": "pokemon"
   }
}

After:

[
    {
        "_id": "65915e9052657d4814a173c4",
        "name": "vaporeon",
        "happiness": 100
    },
    {
        "_id": "65915e9f52657d4814a173c7",
        "name": "squirtle",
        "happiness": 100
    }
]

There is also *expandId
Before:

{
   "*expandId": {
     "id": "65915e9052657d4814a173c4",
     "from": "pokemon"
   }
}

After:

 {
     "_id": "65915e9052657d4814a173c4",
     "name": "vaporeon",
     "happiness": 100
 }

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