Different ways of running active record migration.

Tags

active-record, mysql, postgres, rails, ruby, sinatra

Considering that you have not setup your database for your app. At that time, you can easily setup your database using given commands:

bundle exec rake db:create
bundle exec rake db:migrate

OR simply you can hit

bundle exec rake db:setup

If you need to run a specific migration file. Then use these commands Using VERSION

 bundle exec rake db:migrate VERSION='timestamp of given migration file'

Redo that VERSION

 bundle exec rake db:migrate:redo VERSION='timestamp of given migration file'

Redo that VERSION specifying step

 rake db:migrate:redo STEP=3

Using Rails Console

bundle exec rails c
require "#{Rails.root}/db/migrate/your_migration_file_name.rb"
YourMigrationFile.new.change

OR
ActiveRecord::Migration.{{migration_type}} :table_name, :column_name
Example: ActiveRecord::Migration.remove_column :table_name, :column_name

Some extra commands you may need

YourMigrationFile.new.change.migrate
YourMigrationFile.new.change.migrate(:up)

Hope you can tackle any type of active-record migration and  issues while doing migrations. 🙂