2011-08-20 11 views

Respuesta

3

se puede ver en la fuente aquí: https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/routing/polymorphic_routes.rb

Cuando redirect_to toma un modelo, se filtra a través de algunos métodos para obtener la ruta llamando al método polymorphic_url. El API para este método [1] en realidad tiene una gran cantidad de detalles, copiada de los comentarios aquí:

# 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() 

En esencia, la respuesta a su pregunta es que llama (equivalentemente) Método de la model_path (@Model) para el modelo.

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