How to create smart, nested links?

in routing

     resources :departments do
       resources :buildings do
         resources :halls do
       end
       resources :chairs do
         resources :buildings do
           resources :halls do
         end
       end
     end

I want to share the same views of buildings and halls between chairs and departments. And I am thinking to create url's in views this way:

link_to "Show", [@department, @chair, @building, @hall].compact

If @chair doesn't exist, it's gonna be nil, so upper link will generate:

link_to "Show", [@department, @building, @hall]

If @chair exist:

link_to "Show", [@department, @chair, @buildi开发者_JS百科ng, @hall]

My question is: How to create this way url's to edit, or new action? Or maybe there exist better solution for this problem with this kind of nested resources?

You can stick a symbol in the array as well. So something like this:

link_to "Edit", [:edit, @department, @chair, @building, @hall]

I have an application where we nest three up to four resources deep. One example is the management of contacts. We have Company, Location and Contact models.

Usually you can access the new and edit paths with new_department_chair_building_path(@department,@chair).

Do not forget to include the hidden ID's from your predecessors (deparment, chair) in the form for a new building.

In your building controller you will have to filter out what objects to load depending on the the context. We do it something like this

# Company controller
def index
  if params[:project]
    @project = ....
  end
end

There may be better ways to do this, but we haven't found any.

In the views we check for @project and then render partials.

I hope this may somewhat help you.

Cheers,

Dan