Commits on Aug 12, 2024

1. Add support for horizontal sharding for Rails 6.1+ …

   Since Rails 6.1, it is possible for a model to connect to multiple
   databases. A minimal example of such application is:
   
   ```ruby
   class ApplicationRecord < ActiveRecord::Base
     connects_to shard: {
       defaul: { writing: :primary_db },
       shard_one: { writing: :secondary_db }
     }
   end
   
   class User < ApplicationRecord; end
   
   ApplicationRecord.connected_to(shard: :shard_one, role: :writing) do
     User.create!(...) # creates users in secondary_db DB
   end
   
   ApplicationRecord.connection_handler.connection_pools.map { |pool|
   pool.db_config.configuration_hash[:database] } # [:primary_db,
   :secondary_db]
   ```
   
   With support for multiple databases for a model, one would have something like this in tests:
   
   ```ruby
   DatabaseCleaner[:active_record, db: ApplicationRecord]
   
   DatabaseCleaner.start
   DatabaseCleaner.clean
   ```
   
   In `.clean`, however, the bug occurs: it doesn't actually
   delete or truncate data from the :secondary_db.
   
   To fix the bug, DatabaseCleaner should iterate through _all_ connection pools the model is connected to.

   Alexei Șerșun committed Aug 12, 2024
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