例外：ActiveRecord::ConnectionNotEstablished 使用 pubnub

Question

我在我的项目中使用 pubnub，它订阅了一个频道，在我的订阅者中我更新了我的数据库。我在这样的初始化文件中完成所有这些工作

$callback_location = (lambda do |envelop|
  begin
    case envelop.channel
      when "iwm_driver_locations"
        last_location = LatLong.where(driver_id: envelop.message['driver_id']).last
        if last_location.lat != envelop.message['lng'] and last_location.lng != envelop.message['lat']
          l = LatLong.create!(
              lat: envelop.message['lat'],
              lng: envelop.message['lng'],
              driver_id: envelop.message['driver_id']
          )
        end
      when "iwm_chat"
        m = Message.create!(
            :author => envelop.message,
            :message => envelop.message,
            :timetoken => envelop.timetoken
        )
    end
  rescue Exception => e
    Rails.logger.info "****** Exception: #{e}"
  end
end)

$pubnub.subscribe(
    :channel => ['iwm_chat', 'iwm_driver_locations'],
    :callback => $callback_location
) unless $pubnub.subscription_running?

但我的订户在某些尝试中抛出异常 ConnectionNotEstablished。然而，有时这段代码可以毫无问题地执行。

我尝试增加数据库超时和池，但同样的问题仍然存在。知道我哪里做错了吗？

Answer 1

尝试在触发 $pubnub.subscribe 之前添加 ActiveRecord::Base.establish_connection。应该有帮助。

例外：ActiveRecord::ConnectionNotEstablished 使用 pubnub

Exception: ActiveRecord::ConnectionNotEstablished on using pubnub

ruby

activerecord

mysql2

pubnub

ruby-on-rails-4