[WIP] Allow Jennifer::Migration::Runner.migrate to specify an adapter.

[didactic-drunk]

This partially to support sharding. New shards may be brought online or have been offline for some time requiring migration Version tracking per shard.

I'm stuck here.

private def self.process_up_migration(migration, adapter)
        optional_transaction(migration) do
          process_with_announcement(migration, :up) do
            migration.up
            Version.create(version: migration.class.version)
          end
        end

How do I cleanly pass the adapter to

• optional_transaction(migration)
• process_with_announcement(migration, :up) do
• migration.up

As arguments? Using a class var like I did for Version? Other?

Migration
Allow Jennifer::Migration::Runner.migrate to specify an adapter.