rails-db: add page (#3070)

pages/common/rails-db.md

@@ -0,0 +1,35 @@
+# rails db
+
+> Various database-related subcommands for Ruby on Rails.
+
+- Create databases, load the schema, and initialize with seed data:
+
+`rails db:setup`
+
+- Access the database console:
+
+`rails db`
+
+- Create the databases defined in the current environment:
+
+`rails db:create`
+
+- Destroy the databases defined in the current environment:
+
+`rails db:drop`
+
+- Run pending migrations:
+
+`rails db:migrate`
+
+- View the status of each migration file:
+
+`rails db:migrate:status`
+
+- Rollback the last migration:
+
+`rails db:rollback`
+
+- Fill the current database with data defined in db/seeds.rb:
+
+`rails db:seed`