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Backend coding challenge

Ruby on Rails application that automates a calculation of merchants’ disbursements payouts and seQura commissions. Link to original challenge: https://sequra.github.io/backend-challenge/

Application uses:

  • Ruby version - 3.0.4
  • Rails version - 7.1.2
  • PostgreSQL version - 14.10
  • Sidekiq version - 7.2

Features

  1. Parsing merchants.csv file to validate and save data in merchants table
  2. Parsing orders.csv file to validate, calculate fee and save data in orders table
  3. Calculate monthly fees for all existing merchants from live on date to current date
  4. Calculate daily and weekly disbursements for all merchants' orders
  5. Calculate disbursements on daily basis
  6. Calculate disbursements on weekly basis

Calculations

Note: Monthly fee calculations for all merchants are calculated from live on date to current date (last calculated month is December 2023), even if there are no orders for December in orders.csv file!

Year Number of disbursements Amount disbursed to merchants Amount of order fees Number of monthly fees charged (From minimum monthly fee) Amount of monthly fee charged (From minimum monthly fee)
2022 1009 29035379.3 262968.56 46 1072.88
2023 7870 143096726.46 1300058.84 214 4868.69

Files to download (DB dump, .CSV files)

Dropbox link: https://www.dropbox.com/scl/fo/r3x8xnbbmbqnm6s2mujaa/h?rlkey=2x62x65vkbxy2aru05ui4c8iu&dl=0

.CSV files provided via the original challenge are invalid.

Launch

Before start working with the database, ensure you have the PostgreSQL service running: brew services list

  1. git clone git@github.com:denis-mironov/sequra.git
  2. bundle install
  3. rake db:create
  4. Filling DB with data:

    • Parsing .CSV files and using rake tasks (time consuming operation):

      • rake db:migrate
      • download 'merchants.csv' and 'orders.csv' files via Dropbox link above
      • create new 'db/csv_dumps' directory in the project and put downloaded .CSV files there
      • run next rake tasks:
      • rake fill_table_with_data:merchants
      • rake fill_table_with_data:orders
      • rake fill_table_with_data:monthly_fees
      • rake disbursements:fill_daily
      • rake disbursements:fill_weekly

    • Using DB dump (merchants, orders, disbursements and monthly_fees are included):

      • download 'development_dump.sql' file via Dropbox link above
      • psql sequra_development < link_to_downloaded_dump_file
      • rake db:migrate

Check Sidekiq jobs execution

  1. Install and run Redis service (official Redis documentation)
  2. Run Sidekiq server with sidekiq comand.

Run test files

  • rspec spec

Run rubocop checks

  • rubocop