Internal Wallet System

Requirements

• Based on relationships every entity e.g. User, Team, Stock or any other should have their own defined "wallet" to which we could transfer money or withdraw
• Every request for credit/debit (deposit or withdraw) should be based on records in database for given model
• Every instance of a single transaction should have proper validations against required fields and their source and targetwallet, e.g. from who we are taking money and transferring to whom? (Credits == source wallet == nil, Debits == targetwallet == nil)
• Each record should be created in database transactions to comply with ACID standards
• Balance for given entity (User, Team, Stock) should be calculated by summing records

To Do:

• Initialize the Rails application.
• Initialize the testing environment with RSpec and Guard.
• Create the following models with the specified attributes and associations:
  • Users, Stocks, and Teams:
    • Name (required)
    • One wallet (through a polymorphic association using the STI pattern)
  • Wallet:
    • Belongs to a walletable (polymorphic)
    • Has many transactions
  • Transactions:
    • Source wallet (belongs to a wallet)
    • Target wallet (belongs to a wallet)
    • Amount (required)
• Implement proper calculations for transaction kinds and wallet actions:
  • Deposit:
    • Amount without source wallet
  • Withdraw:
    • Amount without target wallet
  • Transfer:
    • Amount with source/target wallet
  • Wallet balance:
    • Target transactions minus source transactions
    • Zero if there are no transactions
  • Transaction validations:
    • Amount should be greater than 0
    • Before creating a transaction, amount should be less than or equal to the source wallet's actual balance
• On Users/Stocks/Teams creation, create a wallet for each.
• Initialize the frontend with StimulusJS, Bootstrap, and FontAwesome.
• Implement the following frontend views and actions:
  • Wallet:
    • List owners
    • Create owner: creates Users/Stocks/Teams with a name
    • Show: displays balance and transactions
  • Transactions:
    • Deposit/Withdraw/Transfer.

Run this example:

git clone git@github.com:rizperdana/wallet.git
cd wallet/
bundle
yarn install --check-files
rails db:migrate RAILS_ENV=development
rails s