Strange Rails Routing behaviour: two ids swapped around in nested resources

问题

I have the following routing set up in my app (forms belong to a site):

map.resources :sites do |site| 
 site.resources :forms
end 

However, when I try to go to a path for edit (or such) for a form using the helpers (e.g.

edit_site_form_path(form)

or

<%= link_to 'Show', [:site, form] %>

my URLs are coming out with the ID's swapped over ( /sites/5/forms/1 ) where 5 is the form Id, and 1 is the site id. This is from the page /sites/1.

Help(?)

回答1:

The edit_site_form_path method has to have two parameters, the site_id and the form_id. So in your example you are only passing in the form_id. The first parameter is what ever model comes first in the method, in this case it is site. The second parameter is the form_id.

A revamped path method might look like this

 edit_site_form_path(form.site, form)

(assuming you have a model Form which belongs_to :site)

来源：https://stackoverflow.com/questions/761360/strange-rails-routing-behaviour-two-ids-swapped-around-in-nested-resources