Immigrate adds methods to ActiveRecord::Migration to create and manage foreign-data wrappers in PostgreSQL.

Add this line to your application's Gemfile:

gem 'immigrate'

And then execute:

$ bundle install

You will need to have a connection to a remote server before you can create a foreign table. This connection has to be created with connection information and user credentials for the foreign server in a config/immigrate.yml file:

development:
  foreign_server:
    host: 192.83.123.89
    port: 5432
    dbname: foreign_db
    user: foreign_user
    password: password

production:
  foreign_server:
    host: 192.83.123.90
    port: 5432
    dbname: foreign_db
    user: foreign_user
    password: password

Next you will need to create a migration to create the connection using a standard migration file like `db/migrate/[TIMESTAMP]_create_foreign_connection.rb:

class CreateForeignConnection < ActiveRecord::Migration[5.0]
  def change
    create_foreign_connection :foreign_server
  end
end

Then you can run the migration as usual:

$ rake db:mibrate

Once you have a foreign connection you can now create migrations for the foreign tables you need to access in your application. This also goes in a standard migration file:

class CreatePost < ActiveRecord::Migration[5.0]
  def change
    create_foreign_table :posts do |t|
      t.string :title
      t.text :body
    end
  end
end

And once again you can run your migrations as usual:

$ rake db:mibrate

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/ratdaddy/immigrate. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.