Two Devise Models, With Association Issue - ruby-on-rails

Question

I have two models for devise. Client, and Engineer.
The Client belongs to the Engineer. From the Engineer#show page, I'm trying to link to the client but I'm getting a devise mapping error.
Could not find devise mapping for path "/clients/10".
I have two controllers, one for devise and one regular (controllers/client/registration_controller and controllers/client_controller)
My routes file looks like this...
devise_for :clients, :controllers => {:registrations => "client/registrations"}
resources :clients, :only => [:show, :new, :create]
devise_for :engineers, :controllers => {:registrations => "engineer/registrations"}
resources :engineers, :only => [:show]
devise_scope :client do
get "clients/:id", to: "clients#show"
end
Are the resources :clients competing with the scope declaration?
For good measure my rake routes:
new_client_session GET /clients/sign_in(.:format) devise/sessions#new
client_session POST /clients/sign_in(.:format) devise/sessions#create
destroy_client_session DELETE /clients/sign_out(.:format) devise/sessions#destroy
client_password POST /clients/password(.:format) devise/passwords#create
new_client_password GET /clients/password/new(.:format) devise/passwords#new
edit_client_password GET /clients/password/edit(.:format) devise/passwords#edit
PATCH /clients/password(.:format) devise/passwords#update
PUT /clients/password(.:format) devise/passwords#update
cancel_client_registration GET /clients/cancel(.:format) client/registrations#cancel
client_registration POST /clients(.:format) client/registrations#create
new_client_registration GET /clients/sign_up(.:format) client/registrations#new
edit_client_registration GET /clients/edit(.:format) client/registrations#edit
PATCH /clients(.:format) client/registrations#update
PUT /clients(.:format) client/registrations#update
DELETE /clients(.:format) client/registrations#destroy
clients POST /clients(.:format) clients#create
new_client GET /clients/new(.:format) clients#new
client GET /clients/:id(.:format) clients#show
new_engineer_session GET /engineers/sign_in(.:format) devise/sessions#new
engineer_session POST /engineers/sign_in(.:format) devise/sessions#create
destroy_engineer_session DELETE /engineers/sign_out(.:format) devise/sessions#destroy
engineer_password POST /engineers/password(.:format) devise/passwords#create
new_engineer_password GET /engineers/password/new(.:format) devise/passwords#new
edit_engineer_password GET /engineers/password/edit(.:format) devise/passwords#edit
PATCH /engineers/password(.:format) devise/passwords#update
PUT /engineers/password(.:format) devise/passwords#update
engineer GET /engineers/:id(.:format) engineers#show
GET /clients/:id(.:format) clients#show
root GET / pages#home
pages_clients GET /pages/clients(.:format) pages#clients
pages_engineers GET /pages/engineers(.:format) pages#engineers

Answer 1

I'm pretty sure you should just drop your devise_scope block, since you have the following line:
resources :clients, :only => [:show, :new, :create]
This line already gives you client_path:
client GET /clients/:id(.:format) clients#show
but your devise_scope gives you a duplicate (but unnamed) path:
GET /clients/:id(.:format) clients#show
So, your routes file should look like:
devise_for :clients, :controllers => {:registrations => "client/registrations"}
resources :clients, :only => [:show, :new, :create]
devise_for :engineers, :controllers => {:registrations => "engineer/registrations"}
resources :engineers, :only => [:show]