What is the best way to resolve Rails orphaned migrations?

Question

I have been switching between branches in a project and each of them have different migrations... This is the scenario:

$ rake db:migrate:status

<

Answer 1

Here's a rake task I wrote for this purpose. It invokes the same method that the db:migrate:status uses under the hood, ActiveRecord::Base.connection.migration_context.migrations_status

# lib/tasks/cleanup_migration_entries.rake

desc 'Removes schema_migration entries for removed migration files'
task 'db:migrate:cleanup': :environment do
  migration_context = ActiveRecord::Base.connection.migration_context
  versions_to_delete =
    migration_context.migrations_status
                     .filter_map { |_status, version, name| version if name.include?('NO FILE') }

  migration_context.schema_migration.delete_by(version: versions_to_delete)

  puts "Cleaned up #{versions_to_delete.size} orphaned migrations."
end