Rails更新参数问题 [英] Rails problems with update parameters

问题描述

我有一个问题，我听不懂...
在我的项目中，我有几种模型。我有个频道，其中有许多个重播，每个重播都有一个提供者（这是一个多态关联）。

I have a problem, that I can't understand... In my project I has several models. I have channel that has many restreams and each restream has one provider (it's a polymorphic assosiation).

所以在代码中，我用另一个替换了一个 restream.provider ，最后， restream.provider 的值为 nil 。我尝试放置大量测试输出，所以现在有了这样的结果：在其中一个控制器中，我有一个代码：

So in code I replace one restream.provider with another, and in the end restream.provider has a value of nil. I tried to put a lot of testing output, so now I have such a result: in one of the controllers I have a code:

puts channel.restreams.last.provider.to_json
byebug
Delayed::Job.enqueue(StartRestreamJob.new(air.id)) if air.server.online?

和 puts 输出的正是我期望的结果：提供者对象，转换为json。但是在 start_restream_job 中，我也有代码：

and puts outputs exactly what I expect: provider object, converted to json. But in start_restream_job I also has code:

air = Air.find(air_id)
channel = air.channel
puts channel.restreams.last.provider.to_json
byebug

，它只为我提供 null 字符串。结果，保存在数据库中的 restream 对象与 provider 没有关联。
可能是什么问题？

and it provides me only with null string. As a result, restream object, saved in database, has no association with provider. What can be the problem with it?

感谢！

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======================

将新的提供者分配给的代码 restream ：

new_provider = ProviderType1.new(restream.provider.params_hash)
#params hash provides some variables that I need to save from old provider
old_provider = restream.provider
new_provider.restream = restream
res = new_provider.initialize_event
#here some requests for external services are being made, after what some attributes of provider are being updated and after that provider is being saved by calling self.save!
if res == ProviderType1.SUCCESS_CODE
  old_provider.restream = nil
  old_provider.save!
  old_provider.destroy
  new_provider.restream = restream
  restream.provider = new_provider
  restream.save!
  new_provider.save!
else
  #smth that does not matter now
end

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UPD

即使增加了对重播和提供者的强制保存也没有任何意义：

Even adding force saving of both restream and provider do not make any sence:

channel.restreams.each do |r|
  r.provider.save!
  r.save
end

我还有一个新的 provider 对象保存在数据库中，但与 stream 对象没有关系，反之亦然。

I still have a new provider object saved in DB, but it has no connection with restream object and vice versa.

============

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UPD 2

在令人敬畏的代码段中添加打印功能为我打开了新的东西：

Adding printing to prevoious piece of code opened a new things for me:

channel.restreams.each do |r|
  r.provider.save!
  r.save!
  puts ProviderType1.find(r.provider_id).restream.to_json

end

Puts打印出 null 。那么这是否意味着 r.provider.save！什么都不做？如果是，那为什么呢？为何保持沉默？
（这在代码中的某个位置运行，其中放置channel.restreams.last.provider.to_json 会打印出一个对象，而不是 null ）

Puts prints out null. So does this mean r.provider.save! does nothing? And if yes, then why so? And why it's keeping silent? (This runs in a place in the code, where puts channel.restreams.last.provider.to_json prints out an object, not null)

推荐答案

帮助我的事情：添加重新加载到 restream ，然后更新像这样的参数： restream.reload.update_attributes（provider：new_provider）

The thing that helped me: adding reload to restream before updating parameters like this: restream.reload.update_attributes(provider: new_provider)

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