blocks|key|3310038|text|Feed可以是包含以下内容的ActiveRecord模型：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3310039|文件附件(载波，回形针，没关系)。|unordered-list-item|3310040|A状态:已处理与否|3310041|3310042|3310043|在控制器中，使用新创建的对象启动后台作业，负责处理文件并更新其状态。|3310044|通过这种方式，您可以跟踪所需的所有更改，并保留历史记录(是否，您选择更新状态或在成功时破坏)。但关键是背景工作有时会失败，你需要一个解决方案。|3310045|至于将csv解析代码放在哪里，我会使用一个服务对象:由于您严重依赖于您的模型，所以我不会将它放在lib中(或者可能是解析逻辑的一部分，而不是模型创建)。|3310046|entityMap^0|0|4|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$]]|$1|I|3|J|5|H|7|Y|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

<code>Feed</code> could be an ActiveRecord model containing:

<ul>
<li>the file attachment (carrierwave, paperclip, never minds).</li>
<li>a status: processed or not</li>
</ul>

In your controller start a background job with the freshly created object responsible to process the file and update its status.

This way you can track all changes required and keep a history (or not, your choice to update status or destroy on success). But the point is background job sometimes fail and you need a solution for this.

As where to put the csv parsing code, I'd use a service object: since you're heavily dependant of your models I wont put this in lib (or maybe a part of the parse logic, but not the model creation)

blocks|key|3310074|text|我会这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3310075|创建一个rake任务，它读取CSV文件并将其写入db。|ordered-list-item|3310076|安装https://github.com/javan/whenever/blob/master/README.md|offset|length|3310077|无论何时配置以在所需间隔内执行作业|3310078|如果需要，将业务逻辑添加到rake任务或其他“作业”样式类中。|3310079|让你的应用程序简单地阅读模型的结果|3310080|3310081|3310082|您也可以使用Resque或Sidekiq，但是对于一个简单的任务来说，这可能太过了。|3310083|这样，你有一个“设置和忘记”的设置，你可以设置，无论何时创业板，以查看任何X分钟左右，不必担心时机时，CSV进来。|3310084|干净的关注点分离和完全自动化。永远不要从控制器触发的动作中读取CSV，因为您将无正当理由阻塞线程.|3310085|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/javan/whenever/blob/master/README.md^0|0|0|2|1J|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|16|8|@]|9|@$G|17|H|18|1|19]]|A|$]]|$1|I|3|J|5|D|7|1A|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|1B|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1C|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1F|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1G|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1H|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

Here is how I would do it:

<ol>
<li>Create a rake task which reads the CSV file and writes it to the db</li>
<li>Install <a href="https://github.com/javan/whenever/blob/master/README.md" rel="nofollow">https://github.com/javan/whenever/blob/master/README.md</a></li>
<li>Configure whenever to execute your job in the desired interval</li>
<li>Add business logic if needed to the rake task or other "job" style class</li>
<li>Have your app simply read the results from the model</li>
</ol>

You could also use Resque or Sidekiq but that might be overkill for one simple task.

This way you have a "set and forget" setup and you can set whenever gem to take a look ever X minutes or so and don't have to worry about timing when the CSV comes in.

Clean separation of concerns and fully automated. Never read a CSV from a controller triggered action as you will block the thread for no good reason...

blocks|key|845314|text|我认为你应该在“模型”文件夹中设置类提要。您可以包括几个辅助模块来向类添加必要的功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|845315|class+Feed
++++include+ActiveModel::Validations+#+support+validation

++++attr_accessor+:file_name

++++validates+:file_name,+presence:+true

++++def+process
++++++++if+valid?
++++++++++++...
++++++++end
++++end
end|code-block|syntax|javascript|845316|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I think you should make class Feed in models folder. You can include several helper modules to add necessary functionality to the class.

<pre><code>class Feed
 include ActiveModel::Validations # support validation

 attr_accessor :file_name

 validates :file_name, presence: true

 def process
 if valid?
 ...
 end
 end
end
</code></pre>

Right now I'm working on an app that takes an inventory file (csv), parses it, and persists it to a database. At first I was going to create an Inventory class that would parse the csv and also do business logic on the constructed Inventory database. But now it seems like I should be separating those concerns. The csv file will update daily, so parsing is an important part of the app. 

So I'm now creating a class Feed to handle the inventory feed (.csv), parse it, check for errors, and maybe even act as a json endpoint. The only thing is, there is no need for this class to persist its data, the Inventory class will do that. So if this whole Feed class is a good idea, how would I include it in a Rails project? As a controller without a model? As a .rb file in /lib ? Should I be using rake tasks for this? Other options?

Ruby on Rails app MVC Design decision

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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