Rails 4 update model with subdomain and custom route - ruby-on-rails

Question

I can't update one user model with my custom route (without resources) and one subdomain.
My form is:
<%= form_for :user, :url => services_users_update_url(#user), :html => { :method => 'put', :multipart => true } do |f| %>
while my subdomain is "services".
My routes file:
constraints :subdomain => "services" do
scope :module => "services", :as => "services" do
match '/users/update/' => 'users#update', via: [:put]
end
end
When I display my form page, the url generated in my form is:
http://services.website.dev:3000/8296/users/update
When I confirm my form, the error message is:
No route matches [PUT] "/8296/users/update"
What's wrong in my routes ?
If I try:
match '/users/:id' => 'users#update', via: [:put]
the form generate a route error too.
I also tried:
match '/users/update/:id' => 'users#update', via: [:put]
without success.
EDIT: I want to add more infos.
My form page is located in the subdomain 'cloud' and my update action is located in the subdomain 'services'.

Answer 1

According to your url:
http://services.website.dev:3000/8296/users/update
^^^^/^^^^/^^^^^
:id/users/update
Your routes should be:
constraints :subdomain => "services" do
scope :module => "services", :as => "services" do
put ':id/users/update' => 'users#update', as: :services_users_update
end
end
Read documentation

Answer 2

You can use the built in resources method to generate your route:
constraints subdomain: "services" do
scope module: "services", as: "services" do
resources :users, only: [:update]
end
end