active_record_with_connection_interceptor.rb

class ActiveRecordWithConnectionInterceptor < ::GRPC::ServerInterceptor
  def request_response(**)
    # ref: https://github.com/rails/rails/blob/5-2-stable/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb#L54-L56
    ::ActiveRecord::Base.connection_pool.with_connection do
      yield
    end
  end

  alias_method :server_streamer, :request_response
  alias_method :client_streamer, :request_response
  alias_method :bidi_streamer, :request_response
end