如何生成合适的嵌套资源url_for？ [英] How to generate the proper `url_for` a nested resource?

问题描述

我正在使用Ruby on Rails 3.2.2，并且想为嵌套资源生成一个正确的 url_for URL。也就是说，我有：

I am using Ruby on Rails 3.2.2 and I would like to generate a proper url_for URL for a nested resource. That is, I have:

# config/routes.rb
resources :articles do
  resources :user_associations
end

# app/models/article.rb
class Article < ActiveRecord::Base
  ...
end

# app/models/articles/user_association.rb
class Articles::UserAssociation < ActiveRecord::Base
  ...
end

注意：生成的命名路由就像 article_user_association ， article_user_association ， edit_article_user_association ，...

Note: generated named routes are like article_user_associations, article_user_association, edit_article_user_association, ...

在我看来，我使用：

url_for([@article, @article_association])

然后我得到以下错误：

NoMethodError
undefined method `article_articles_user_association_path' for #<#<Class:0x000...>

但是，如果我以这种方式声明路由器

However, if I state routers this way

# config/routes.rb
resources :articles do
  resources :user_associations, :as => :articles_user_associations
end

url_for 方法会按预期工作，并且会生成例如URL / articles / 1 / user_associations / 1 。

the url_for method works as expected and it generates, for instance, the URL /articles/1/user_associations/1.

注意：在这种情况下，生成的命名路由类似于 article_articles_user_associations ， article_articles_user_association ， edit_article_articles_user_association ，...

Note: in this case, generated named routes are like article_articles_user_associations, article_articles_user_association, edit_article_articles_user_association, ...

但是，我认为路由器的构建/命名方式不是好在后者/工作案例中。因此，是否可以通过生成诸如 article_user_association 之类的命名路由，使 url_for 方法起作用（而不像 article_articles_user_association ）？

However, I think it isn't "good" the way routers are builded / named in the latter / working case. So, is it possible in some way to make the url_for method to work by generating named routes like article_user_association (and not like article_articles_user_association)?

我阅读了与 ActionDispatch相关的官方文档 :: Routing :: UrlFor 方法（特别是为命名路由生成URL部分），但是我找不到解决方案。也许有一种方法可以让Rails使用特定的命名路由器，就像您想通过 self.primary_key 语句...

I read the Official Documentation related to the ActionDispatch::Routing::UrlFor method (in particular the "URL generation for named routes" section), but I cannot find out a solution. Maybe there is a way to "say" to Rails to use a specific named router as-like it makes when you want to change the primary key column of a table with the self.primary_key statement...

# app/models/articles/user_association.rb
class Articles::UserAssociation < ActiveRecord::Base
  # self.primary_key = 'a_column_name'
  self.named_router = 'user_association'

  ...
end

推荐答案

您的 UserAssociation 模型位于 Articles 命名空间，该命名空间包含在命名路由中：

Your UserAssociation model is in the Articles namespace, which gets included in the named route:

# app/models/articles/user_association.rb
class Articles::UserAssociation < ActiveRecord::Base
  ...
end

#        route =>           articles_user_association
# nested route =>   article_articles_user_association

如果删除名称空间，您将获得所需的路由助手：

If you remove the namespace, you will get the route helper you are looking for:

# app/models/articles/user_association.rb
class UserAssociation < ActiveRecord::Base
  ...
end

#        route =>           user_association
# nested route =>   article_user_association

除非您有充分的理由保留 UserAssociation 不在命名空间中。

Unless you have a really good reason for keeping UserAssociation in a namespace, don't.

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