Problems with "link_to"

NEW EDITING

With resources :cases in the routes.rb all these routing helpers work as expected (c is an instance of the model Case):

cases_path          # Index action
new_case_path       # New action
case_path(c)        # Show action
edit_case_path(c)   # Edit action

Changing routes.rb to this:

scope "/:area" do
  resources :cases
end

two routing helpers fail (see error below):

cases_path         # OK
new_case_path      # OK
case_path(c)       # Fail
edit_case_path(c)  # Fail

To make it works I need to change the last two helpers in:

cases_path                                 # OK
new_case_path                              # OK
case_path(c, :area => params[:area])       # OK
edit_case_path(c, :area => params[:area])  # OK

Why there is no need to give :area to the first two helpers and there is a need for the second two? It makes the code confusing...

OLD QUESTION

Initially I had this routes.rb:

resources :cases

and I could generate links of this type

exa开发者_Python百科mple.com/cases/3

to show the case with ID = 3 with:

link_to("Show this case", @case)

Then I modified routes.rb to:

scope "/:area" do
  resources :cases
end

end the link_to above give me the error

No route matches {:action=>"show", :controller=>"cases", :area=>#<Case id: 2,

It seems that rails does not get the :area from the parameters automatically. I could fix this forcing the area creating a link with

link_to("Show this case", case_path(params[:area], @item))

to obtain the link to

example.com/area1/cases/3

but I really don't like it. Am I doing something wrong? Why rails bring over the controller and the action but forget about the area?

Try this

link_to "Show this case", [:area, @case]

EDIT (remove the colon)

scope "/area" do
  resources :cases
end

EDIT 2

link_to "Show this case", case_path(@case, :area => :en)

If you specified area as argument you should always pass it.

Add this method to your ApplicationController:

def default_url_options(options={})
  {:area => params[:area]}
end

You then don't have to manually set the :area option in your routing helpers