Add custom TokensController for login

app/controllers/tokens_controller.rb

@@ -0,0 +1,36 @@
+class TokensController < Doorkeeper::TokensController
+    # Overriding create action
+    # POST /oauth/token
+    def create
+        response = strategy.authorize
+        body = response.body
+
+        if response.status == :ok
+            # User the resource_owner_id from token to identify the user
+            user = User.find(response.token.resource_owner_id) rescue nil
+
+            unless user.nil?
+                ### If you want to render user with template
+                ### create an ActionController to render out the user
+                # ac = ActionController::Base.new()
+                # user_json = ac.render_to_string( template: 'api/users/me', locals: { user: user})
+                # body[:user] = Oj.load(user_json)
+
+                ### Or if you want to just append user using 'as_json'
+                body[:user] = {
+                    id: user.id,
+                    username: user.username
+                }
+
+            end
+        end
+  
+        self.headers.merge! response.headers
+        self.response_body = body.to_json
+        self.status        = response.status
+  
+    rescue Doorkeeper::Errors::DoorkeeperError => e
+        handle_token_exception e
+    end
+end
+  

config/routes.rb

@@ -1,5 +1,6 @@
 Rails.application.routes.draw do
     use_doorkeeper do
+        controllers :tokens => 'tokens'
         skip_controllers :applications, :authorized_applications
     end