Interviews - Financial Summary

Overview

This is a fairly typical and small rails project.

database: sqlite3
test framework: rspec

The project contains the following models:

User
- Represents an end-user identified by an email
- Has many wallets
Wallet
- Contains a money balance (amount, currency)
- Belongs to a user
Transaction
- A financial transaction performed by a user
- Contains a money amount (amount, currency)
- Described by a category (deposit, refund, withdraw)
- Belongs to a user
- Example: a transaction for a deposit that placed $5 USD into a user's wallet
Financial Summary
- A summary of count and amount of deposits, withdraws, refunds for a given user and currency
- A summary spans over one day, seven days and a lifetime of a user's transactions

The Problem

Implement the logic for the FinancialSummary. There are pending specs that you should make pass. The specs are non-exhaustive (hint hint).

Installation

You will need:

ruby 2.4.2
bundler

Assuming you have ruby installed, install bundler:

$ gem install bundler

cd to the project dir and install dependencies:

$ bundle

Run specs:

$ bundle exec rspec

Submission

Push this entire project (with your changes) onto Github and send us the link to the repo.

Remarks