Question

I have added monetize and demonetize helpers inside ActiveRecord::Migration, ActiveRecord::ConnectionAdapters::TableDefinition and ActiveRecord::ConnectionAdapters::Table by that pull request.

That file shows usage examples. So you will understand invented changes at glance. (It works)

But I have no idea how to test my helpers. What way can I write specs for them? All my attempts of writing migrations in spec files and running them manually failed. Migration manual run did not change table (or I was unable to detect changes) and did not throw any exception.

Example of my attempt:

describe 'monetize' do
  class MonetizeMigration < ActiveRecord::Migration
    def change
      create_table :items
      monetize :items, :price
    end
  end

  class Item < ActiveRecord::Base; end

  it 'should monetize items' do
    MonetizeMigration.up    #=> nil
    Item                    #=> Item(has no table)
  end
end  

Answer 1

You can execute any migration helper methods right on your database connection:

ActiveRecord::Base.connection.create_table :items

Thanks to @happy_user for showing my mistake in first attempt. I think someone may use my latest solution in the future, so I’ll leave it here.