redirect_to（@model）在rails中意味着什么？

Question

从这个网址http://www.helloworlder.com/?p=6我发现redirect_to或render的语法，需要一个字符串。

像这样：

render(:action=>’my_action’) 
redirect_to(:action=>’my_action’) 

但是在Ruby导轨导我看到类似redirect_to(@model)。在他们的文件中指出，它将会采取行动。请解释redirect_to(@model)的含义。

感谢

Answer 1

例如，你有一个Post模型。

redirect_to的@model将带您到这个网页：

http://yourapp/posts/:id/show

Answer 2

你可以看一下这里的源： https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/routing/polymorphic_routes.rb

当redirect_to的采用模型，它过滤通过一些方法来获取路径调用polymorphic_url方法。这个方法的API [1]其实有很多细节，从这里评论复制：

# Constructs a call to a named RESTful route for the given record and returns the 
    # resulting URL string. For example: 
    # 
    # # calls post_url(post) 
    # polymorphic_url(post) # => "http://example.com/posts/1" 
    # polymorphic_url([blog, post]) # => "http://example.com/blogs/1/posts/1" 
    # polymorphic_url([:admin, blog, post]) # => "http://example.com/admin/blogs/1/posts/1" 
    # polymorphic_url([user, :blog, post]) # => "http://example.com/users/1/blog/posts/1" 
    # polymorphic_url(Comment) # => "http://example.com/comments" 
    # 
    # ==== Options 
    # 
    # * <tt>:action</tt> - Specifies the action prefix for the named route: 
    # <tt>:new</tt> or <tt>:edit</tt>. Default is no prefix. 
    # * <tt>:routing_type</tt> - Allowed values are <tt>:path</tt> or <tt>:url</tt>. 
    # Default is <tt>:url</tt>. 
    # 
    # ==== Examples 
    # 
    # # an Article record 
    # polymorphic_url(record) # same as article_url(record) 
    # 
    # # a Comment record 
    # polymorphic_url(record) # same as comment_url(record) 
    # 
    # # it recognizes new records and maps to the collection 
    # record = Comment.new 
    # polymorphic_url(record) # same as comments_url() 
    # 
    # # the class of a record will also map to the collection 
    # polymorphic_url(Comment) # same as comments_url() 

本质上说，回答你的问题是，它调用（等效）的model_path（@model）方法该模型。

[1] http://apidock.com/rails/ActionController/PolymorphicRoutes/polymorphic_url