DEEL BACKEND TASK

This is the solution of the backend exercise implemented by Guillermo Posse It involves building a Node.js/Express.js app that will serve a REST API. I spent 3:25 hours in the implementation and unit testing.

Data Models

All models are defined in src/model.js

Profile

A profile can be either a client or a contractor. clients create contracts with contractors. contractor does jobs for clients and get paid. Each profile has a balance property.

Contract

A contract between and client and a contractor. Contracts have 3 statuses, new, in_progress, terminated. contracts are considered active only when in status in_progress Contracts group jobs within them.

Job

contractor get paid for jobs by clients under a certain contract.

Deposit

A deposit model was added to keep record of all the deposits made in the system. Database migrations also created

Technical Notes

• The server is running with nodemon which will automatically restart for you when you modify and save a file.

• The database provider is SQLite, which will store data in a file local to your repository called database.sqlite3. The ORM Sequelize is on top of it. You should only have to interact with Sequelize - please spend some time reading sequelize documentation before starting the exercise.

• To authenticate users use the getProfile middleware that is located under src/middleware/getProfile.js. users are authenticated by passing profile_id in the request header. after a user is authenticated his profile will be available under req.profile. make sure only users that are on the contract can access their contracts.

• The server is running on port 3001.

APIs Implemented

Below is a list of the application's API's.

1. GET /contracts/:id - Returns contract only if associated to the current user

2. GET /contracts - Returns a list of contracts belonging to a user (client or contractor), the list should only contain non terminated contracts.

3. GET /jobs/unpaid - Get all unpaid jobs for a user (either a client or contractor), for active contracts only.

4. POST /jobs/:job_id/pay - Pay for a job, a client can only pay if his balance >= the amount to pay. The amount should be moved from the client's balance to the contractor balance.

5. POST /balances/deposit/:userId - Deposits money into the the the balance of a client, a client can't deposit more than 25% his total of jobs to pay. (at the deposit moment)

6. GET /admin/best-profession?start=<date>&end=<date> - Returns the profession that earned the most money (sum of jobs paid) for any contactor that worked in the query time range.

7. GET /admin/best-clients?start=<date>&end=<date>&limit=<integer> - returns the clients the paid the most for jobs in the query time period. limit query parameter should be applied, default limit is 2.

 [
    {
        "id": 1,
        "fullName": "Reece Moyer",
        "paid" : 100.3
    },
    {
        "id": 200,
        "fullName": "Debora Martin",
        "paid" : 99
    },
    {
        "id": 22,
        "fullName": "Debora Martin",
        "paid" : 21
    }
]

Going Above and Beyond the Requirements

I provide a Postman collection to test all transactions of the API

Thank you. It was my pleasure working this excercise