Rake db migration touch command. Updates an existing migration version to latest version.

db_migate_touch.rake

# called with: rake db:migrate:touch['123456_migration_file.rb']

namespace :db do
  namespace :migrate do
    desc "Touch migration - Renames file with new version and runs db:migrate:down with old version and db:migrate:up with new version"
    task :touch, [:filename] => [:environment] do |t, args|
      migrate_path = ActiveRecord::Migrator.migrations_path
      filename = args[:filename]

      next_version = ActiveRecord::Migrator.current_version.to_i + 1
      new_filename = filename.gsub(/^\d+/, next_version.to_s)

      match = filename.match(/(^\d+)/)
      raise 'Error no version' unless match
      previous_version = match.captures.first

      ActiveRecord::Migrator.run(:down, ActiveRecord::Migrator.migrations_path, previous_version.to_i)
      File.rename(File.join(migrate_path, filename), File.join(migrate_path, new_filename))
      ActiveRecord::Migrator.run(:up, ActiveRecord::Migrator.migrations_path, next_version.to_i)
      
      puts "Updated migration filename from: #{filename} to: #{new_filename}"
    end
  end
end

Found this useful, thanks.

With Rails 5.1, I get this error on the migrations_path call:

NoMethodError: undefined method `migrations_path' for ActiveRecord::Migrator:Class

So I replaced it with

Rails.application.paths["db/migrate"].to_a

from https://api.rubyonrails.org/classes/ActiveRecord/Tasks/DatabaseTasks.html#method-i-migrations_paths
as well as the calls in the .run params.