shingonoide/atm

ATM application sample

Description

This is a simple application to emulate simple bank ATM features.

Bootstrap application

This README would normally document whatever steps are necessary to get the application up and running.

Things you may want to cover:

• Ruby version

  • Ruby 3.1.2

• System dependencies

  • Docker

• Configuration

  • Setup time zone 'America/Sao_Paulo'

• Database creation

  • make shell
  • bin/rails db:create

• Database initialization

  • make shell
  • bin/rails db:create

• How to run the test suite

  • make test

Application Notes for Development

Requirements

The Client can do:

• Register, edit and close your account
• Make Deposits
• Make Withdraws
• Make Transfers between accounts
• Request for account balance
• Request for account statement filtered by initial and end date.

Rules:

• The account can't be destroyed
• To request withdrawal and transfers user must be authenticated
• The account balance should never be a negative value
• Transfer fee rules
  • Monday to Friday between 9 to 18 hours the is 5 Reais per transfer
  • Outside that time the fee is 7 Reais
  • More than 1000 Reais additional fee of 10 Reais

Entities

• Account
  • Authentication
  • Validate account never below zero
  • fields:
    • account_number
    • balance
• Transactions
  • fields:
    • account_id
    • type (DEPOSIT,WITHDRAW,TRANSFER)
    • amount
    • created_at

SQL samples

# Tranfer
transaction:
  SELECT ... FOR UPDATE
  INSERT INTO transactions (transaction_id, account_id, type, value, description, created_at) VALUES (id, 1, 'WITHDRAW', 10, 'Tranfer to 2', now())
  INSERT INTO transactions (transaction_id, account_id, type, value, description, created_at) VALUES (id, 2, 'DEPOSIT', 10, 'Tranfer from 1', now())
  INSERT INTO transactions (transaction_id, account_id, type, value, description, created_at) VALUES (id, 1, 'WITHDRAW', 5, 'Tranfer Fee', now())
end

DEPOSIT
transaction:
  INSERT INTO transactions (transaction_id, account_id, type, value, description, created_at) VALUES (id, 1, 'DEPOSIT', 10, '', now())
end

-- WITHDRAW
transaction:
  INSERT INTO transactions (transaction_id, account_id, type, value, description, created_at) VALUES (id, 1, 'WITHDRAW', 10, '', now())
end

Plugins

• Logic deletion to end account (deleted_at)
• Devise