Generate migrations outside Rails

I have made a minimal example of how to use active record outside of Rails. Rails migrations (Standalone migrations) in non-Rails (and non Ruby) projects.

https://github.com/euclid1990/rails-migration

(Support Rails >= 5.2)

You can refer Rake file in this repo.

There is another gem called otr-activerecord. This gem provides following tasks:

• rake db:create
• rake db:create_migration[name]
• rake db:drop
• rake db:environment:set
• rake db:fixtures:load
• rake db:migrate
• rake db:migrate:status
• rake db:rollback
• rake db:schema:cache:clear
• rake db:schema:cache:dump
• rake db:schema:dump
• rake db:schema:load
• rake db:seed
• rake db:setup
• rake db:structure:dump
• rake db:structure:load
• rake db:version

All you need to do is to install it and add a Rakefile with content

load 'tasks/otr-activerecord.rake'
OTR::ActiveRecord.configure_from_file! 'config/database.yml'

I prefer this gem over active_record_migrations or Standalone Migration because those two gems depend on railties, which is almost the entire Rails. For example, Nokogiri takes a long time to compile, and takes a lot of spaces.