Routing fix for devise_saml_authenticatable

routes_snippet.rb

# Snip snip snip
devise_for :users, skip: [:registrations, :saml_authenticatable], controllers: {sessions: 'devise_sessions'}
# Manually add user editing but disallow registrations [above]
as :user do
  get 'users/edit' => 'devise_registrations#edit', as: 'edit_registration'
  patch 'users' => 'devise_registrations#update', as: 'registration'

  # To avoid conflict saml_authenticatable routes are manually defined here.
  # Also we override the controller.
  resource :session, as: 'saml_session', only: [], controller: 'devise_saml_sessions', path: '/companies/:id/saml' do
    get :new, path: 'sign_in', as: 'new'
    post :create, path: 'auth'
    match :destroy, path: 'sign_out', as: 'destroy', via: :get
    get :metadata, path: 'metadata'
    match :idp_sign_out, path: 'idp_sign_out', via: [:get, :post]
  end
end