How to use Rails named route helpers with parameters?

Question

given this route

match 'posts/hello/:name/:title' => 'post#show', :as => :hello 

• what are the ways that I can call hello_path ?

• if i call hello_path(@post), what does it try to do?

I was hoping that the :name and :title files will bind to the path automatically but it seems that rails only know how to get the :id out of the model object.

instead, it only works if I call it like

<%= link_to "link2", hello_url(:name=> @post.name, :title=>@post.title) %> 

(lack of proper documentation is really killing me)

Answer 1

To answer your two questions:

• At the command line, runrake routes to see what routes there are in your app. It will show you all the ways you can use the named routes, just add "_path" or "_url" to the name of the route which is shown on the left.
• Calling hello_path(@post) will generate a URL to the show page for that hello instance.

The way you are calling it is the norm:

<%= link_to "link2", hello_url(:name=> @post.name, :title=>@post.title) %> 

However, this may work too:

<%= link_to "link2", hello_url(@post.name, @post.title) %> 

Here is some documentation (other than the Rails API) which should help. http://guides.rubyonrails.org/routing.html