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Rails Multi Database

Experiment using 2 database on rails. The databases are MSSQL Server & PostgreSQL.

Use case

Client has legacy apps with data stored in old MSSQL Server database. Client need some additional feature to support his bussiness. But the legacy apps was built with old technology & hard to maintain.

So the solution is rewrite the legacy apps with mature & good community support technology. And gradually migrate data from old MSSQL Server to common good database (PostgreSQL).

Requirements

Requirements: Docker, Docker Compose, Internet

How to run

  1. Clone repo & cd into it
  2. Open Dockerfile.dev. Modify _UID_, _GID_, _USERNAME_, _GROUPNAME_ with your own value from host machine
  3. In project root directory run docker-compose up
  4. Create database & run migrations:
    1. Run docker-compose exec app bin/rails db:create:primary
    2. Run docker-compose exec app bin/rails db:migrate:primary
    3. Run docker-compose exec app bin/rails db:create:legacy
    4. Run docker-compose exec app bin/rails db:migrate:legacy
  5. For legacy data (MSSQL), open http://localhost:3000/legacy/todos on your browser
  6. For primary data (PostgreSQL), open http://localhost:3000/todos on your browser