Run ActiveRecord migrations without Rails

Question

I am trying to update a gem called textacular to be compatible with latest rails version.

In the development Rake-tasks we need to run a few ActiveRecord migrations - without Rails.

Today it looks like:

namespace :migrate do
    desc 'Run the test database migrations'
    task :up => :'db:connect' do
      ActiveRecord::Migrator.up 'db/migrate'
    end

    desc 'Reverse the test database migrations'
    task :down => :'db:connect' do
      ActiveRecord::Migrator.down 'db/migrate'
    end
end

However when using ActiveRecord >= 5, it fails with:

NoMethodError: undefined method 'up' for ActiveRecord::Migrator:Class.

I have tried to look through the source code for ActiveRecord, tried a bunch of different methods but have not managed to run the migrations.

Does anyone have a hint of what to do?

Edit

Using ActiveRecord::Migration.up does nothing, probably just returns based on the method.

Using ActiveRecord::Migration.migrate(:up) gives output:

==  ActiveRecord::Migration: migrating ========================================
==  ActiveRecord::Migration: migrated (0.0000s) ===============================

All migrations are in the folder db/migrate.

Answer 1

You can also use this command:

ActiveRecord::MigrationContext.new(Rails.root.join('db', 'migrate'), ActiveRecord::SchemaMigration).migrate