Implicit routing for nested controllers with same namespace

Question

Given Rails 4.1, two controllers CRM::CompaniesController and CRM::ContactPeople, two models CRM::Company and CRM::ContactPerson and the following routes:

namespace :crm do
  resources :companies do
    resources :contact_people
  end
end

The generated URL helpers contain the CRM namespace only once, which is exactly what I want:

crm_company_contact_people      GET  /crm/companies/:company_id/contact_people(.:format)
new_crm_company_contact_person  GET  /crm/companies/:company_id/contact_people/new(.:format) 
# ...

However, using the Array approach for URL helpers

= form_for([@crm_company, @crm_contact_person]) do |f|

tries to generate a URL with each resource namespaced:

undefined method `crm_company_crm_contact_people_path' for #<#<Class...

I would like to have "crm" in my paths only once at the beginning (unless it breaks a common Rails approach) and it would be ugly to add the URL to each form explicitly. Is there something I can do (perhaps in the routes, the model or the first form_for argument) so that Rails knows how to build the correct path? Or is there a more Rails-like way to generate this kind of structure so that Rails knows automatically how to build the paths?

Answer 1

You need to include the namespace in your call to form_for:

= form_for([:crm, @crm_company, @crm_contact_person]) do |f|

Also, since you're using namespaced models, you need to define the following class method on them (from rails/rails issue #10705) to ignore the namespace:

def self.use_relative_model_naming?
  true
end