插件中的验证方法 [英] Validation methods in plugins

问题描述

我正在使用Ruby on Rails 3.0.7，并且正在尝试为我的应用程序实现act_as_article插件.我要做的是在该插件内为充当文章类"运行 validation 方法(请注意:我的插件需要创建一些数据库表列才能工作-其中一个表示为title属性).

I am using Ruby on Rails 3.0.7 and I am trying to implement an act_as_article plugin for my application. What I would to do is run validation methods for the "acting as article class" inside that plugin (note: my plugin requires to create some database table columns in order to work - one of these is represented by the title attribute).

在我的RoR应用程序中，我有以下代码:

In my RoR application I have this code:

# vendor/plugins/article/lib/acts_as_article.rb
module Article
  extend ActiveSupport::Concern

  included do
    validates :title,  # Validation method
      :presence => true
  end

  module ClassMethods
    def acts_as_article
      send :include, InstanceMethods
    end
  end

  module InstanceMethods
    ...
  end
end

ActiveRecord::Base.send :include, Article


# app/models/review.rb
class Review
  acts_as_article

  ...
end

使用上面的代码，插件可以工作.但是，如果我在Review类中添加如下的 Record Association :

Using the above code the plugin works. However if I add some Record Association in the Review class like this:

class Review
  acts_as_article

  has_many :comments # Adding association

  ...
end

，然后在我的ReviewsController中添加以下内容:

and in my ReviewsController I add the following, as well:

def create
  ...

  @article.comments.build(   # This is the code line 89
    :user_id => @user.id
  )

  if @article.save
    ...
  end
end

我收到此错误

NoMethodError (undefined method `title' for #<Comments:0x00000103abfb90>):
  app/controllers/articles_controller.rb:89:in `create'

可能是因为对所有Review关联"类\模型和Comment类没有 属性运行了验证.我认为这是因为，如果在插件代码中，我会注释掉这样的验证方法

Probably it happens because the validation run for all Review "associated" classes\models and the Comment class doesn't have the title attribute. I think that because if inside the plugin code I comment out the validation method like this

module Article
  ...

  included do
    # validates :title,  # Validation
    #   :presence => true
  end

  ...
end

我再也没有错误.

那么，我该如何解决此问题?

注意:我不是创建插件的专家(这是我第一次)，所以我也隐式地询问我是否在插件实现方面做得很好...

Note: I am not expert on creating plugin (this is my first time), so I ask implicitly also if I'm doing a good job for the plugin implementation...

推荐答案

您在ActiveRecord :: Base中包括了 validates_presence_of:title ，因此每个活动记录模型都在使用它.相反，您应该这样做:

You are including validates_presence_of :title in ActiveRecord::Base, and thus every active record model is picking it up. Instead, you should do:

# vendor/plugins/article/lib/acts_as_article.rb
module Article
  extend ActiveSupport::Concern

   module ClassMethods
    def acts_as_article
      validates :title,  # Add validation method here
        :presence => true
      send :include, InstanceMethods
    end
  end

  module InstanceMethods
    ...
  end
end

因此，您仅在希望通过验证的ActiveRecord模型上包括验证.让我知道这是否解决了您的问题.

So that you only include the validation on ActiveRecord models that expect the validation to go through. Let me know if this solves your issue.

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