application_controller.rb

class ApplicationController < ActionController::API
  
  # Default to json response
  respond_to :json
  
  # Extensions initialization
  include ActionController::Serialization
  
  # Devise strong params
  # before_action :configure_permitted_parameters, if: :devise_controller?
  
  # protected
  # def configure_permitted_parameters
    # devise_parameter_sanitizer.permit(:sign_up) do |user_params|
      # user_params.permit(:email, :password, :password_confirmation)
      # user_params.permit({ roles: [] }, :email, :password, :password_confirmation)
    # end
  # end

end

console

~/Workspace/innovators-api on  master [✘!?] on 🐳 v17.06.0-ce took 5m 9s 
➜ rails routes
                  Prefix Verb   URI Pattern                            Controller#Action
                rswag_ui        /api-docs                              Rswag::Ui::Engine
               rswag_api        /api-docs                              Rswag::Api::Engine
        new_user_session GET    /api/v1/users/sign_in(.:format)        devise/sessions#new
            user_session POST   /api/v1/users/sign_in(.:format)        devise/sessions#create
    destroy_user_session DELETE /api/v1/users/sign_out(.:format)       devise/sessions#destroy
       new_user_password GET    /api/v1/users/password/new(.:format)   devise/passwords#new
      edit_user_password GET    /api/v1/users/password/edit(.:format)  devise/passwords#edit
           user_password PATCH  /api/v1/users/password(.:format)       devise/passwords#update
                         PUT    /api/v1/users/password(.:format)       devise/passwords#update
                         POST   /api/v1/users/password(.:format)       devise/passwords#create
cancel_user_registration GET    /api/v1/users/cancel(.:format)         devise/registrations#cancel
   new_user_registration GET    /api/v1/users/sign_up(.:format)        devise/registrations#new
  edit_user_registration GET    /api/v1/users/edit(.:format)           devise/registrations#edit
       user_registration PATCH  /api/v1/users(.:format)                devise/registrations#update
                         PUT    /api/v1/users(.:format)                devise/registrations#update
                         DELETE /api/v1/users(.:format)                devise/registrations#destroy
                         POST   /api/v1/users(.:format)                devise/registrations#create
            api_v1_clubs GET    /api/v1/clubs(.:format)                api/v1/clubs#index
                         POST   /api/v1/clubs(.:format)                api/v1/clubs#create
             api_v1_club GET    /api/v1/clubs/:id(.:format)            api/v1/clubs#show
                         PATCH  /api/v1/clubs/:id(.:format)            api/v1/clubs#update
                         PUT    /api/v1/clubs/:id(.:format)            api/v1/clubs#update
                         DELETE /api/v1/clubs/:id(.:format)            api/v1/clubs#destroy
           api_v1_events GET    /api/v1/events(.:format)               api/v1/events#index
                         POST   /api/v1/events(.:format)               api/v1/events#create
            api_v1_event GET    /api/v1/events/:id(.:format)           api/v1/events#show
                         PATCH  /api/v1/events/:id(.:format)           api/v1/events#update
                         PUT    /api/v1/events/:id(.:format)           api/v1/events#update
                         DELETE /api/v1/events/:id(.:format)           api/v1/events#destroy
 api_v1_galleries_images POST   /api/v1/galleries/images(.:format)     api/v1/images#create
  api_v1_galleries_image DELETE /api/v1/galleries/images/:id(.:format) api/v1/images#destroy
        api_v1_galleries GET    /api/v1/galleries(.:format)            api/v1/galleries#show
                         PATCH  /api/v1/galleries(.:format)            api/v1/galleries#update
                         PUT    /api/v1/galleries(.:format)            api/v1/galleries#update
                         DELETE /api/v1/galleries(.:format)            api/v1/galleries#destroy
                         POST   /api/v1/galleries(.:format)            api/v1/galleries#create

Routes for Rswag::Ui::Engine:
  root GET  /           rswag/ui/home#index

Routes for Rswag::Api::Engine:

~/Workspace/innovators-api on  master [✘!?] on 🐳 v17.06.0-ce 
➜ rails s
=> Booting Puma
=> Rails 5.2.0.alpha application starting in development 
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.9.1 (ruby 2.4.1-p111), codename: Private Caller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:5000
Use Ctrl-C to stop
Started POST "/api/v1/users?email=test@test.com&password=[FILTERED]" for 127.0.0.1 at 2017-08-20 21:44:30 +0800
   (0.3ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
Processing by Devise::RegistrationsController#create as JSON
  Parameters: {"email"=>"test@test.com", "password"=>"[FILTERED]", "registration"=>{}}
   (0.1ms)  BEGIN
   (0.1ms)  ROLLBACK
Completed 422 Unprocessable Entity in 15ms (Views: 0.8ms | ActiveRecord: 2.3ms)

routes.rb

Rails.application.routes.draw do
  
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
  
  mount Rswag::Ui::Engine => '/api-docs'
  mount Rswag::Api::Engine => '/api-docs'
  
  devise_for  :users,
              :path => '/api/v1/users'
  
  # API version 1
  api_version(:module => "Api::V1", :path => {:value => "api/v1"}) do
    
    resources :clubs
    resources :events
    resource :galleries do
      resources :images, :only => [:create, :destroy]
    end
    
    # devise_for  :users,
    #             :as => :default,
    #             :controllers => {
    #               sessions: 'api/v1/users/sessions',
    #               registrations: 'api/v1/users/registrations',
    #               passwords: 'api/v1/users/passwords'
    #             }
    #             :path => '',
    #             :path_names => {
    #               sign_in: 'login',
    #               sign_up: 'register',
    #               sign_out: 'logout'
    #             }
                
  end
  
  # devise_scope :default_user do
  #   get :logout, :controller => :sessions, :action => :destroy
  # end
  
end

user.rb

class User < ApplicationRecord
  devise :database_authenticatable, :registerable, :recoverable,
         :trackable, :validatable,
         :jwt_authenticatable, jwt_revocation_strategy: JWTBlacklist
end