Extending Devise SessionsController to authenticate using JSON

This is what finally worked.

class Api::V1::SessionsController < Devise::SessionsController  
  def create  
    respond_to do |format|  
      format.html { super }  
      format.json {  
        warden.authenticate!(:scope => resource_name, :recall => "#{controller_path}#new")  
        render :status => 200, :json => { :error => "Success" }  
      }  
    end  
  end  
  def destroy  
    super  
  end  
end  

Also change routes.rb, remember the order is important.

devise_for :users, :controllers => { :sessions => "api/v1/sessions" }
devise_scope :user do
  namespace :api do
    namespace :v1 do
      resources :sessions, :only => [:create, :destroy]
    end
  end
end

resources :users

I ended up using a combination of @akshay’s answer and @mm2001’s answer.

class Api::SessionsController < Devise::SessionsController
  def create
    warden.authenticate!(:scope => resource_name, :recall => "#{controller_path}#failure")
    render :json => {:success => true}
  end

  def destroy
    Devise.sign_out_all_scopes ? sign_out : sign_out(resource_name)
    render :json => {}
  end

  def failure
    render :json => {:success => false, :errors => ["Login Failed"]}
  end
end

… and in the devise initializer, I had to do this to get the #create method to use my :recall handler

# config/initializers/devise.rb
config.navigational_formats = [:"*/*", "*/*", :html, :json]

This is with Devise 1.5.1 and Rails 3.1.