users api を追加

api-demo/app/apis/api/base.rb

@@ -1,4 +1,5 @@
 module API
   class Base < Grape::API
+    mount V1::Base
   end
 end

api-demo/app/apis/api/v1/base.rb

@@ -0,0 +1,13 @@
+module API
+  module V1
+    class Base < Grape::API
+      format :json
+      default_format :json
+
+      prefix 'api'
+      version 'v1', using: :path
+
+      mount V1::Users
+    end
+  end
+end

api-demo/app/apis/api/v1/users.rb

@@ -0,0 +1,11 @@
+module API
+  module V1
+    class Users < Grape::API
+      resource :users do
+        get do
+          present User.all, with: Entity::V1::UsersEntity
+        end
+      end
+    end
+  end
+end

api-demo/app/apis/entity/v1/users_entity.rb

@@ -0,0 +1,7 @@
+module Entity
+  module V1
+    class UsersEntity < Grape::Entity
+      expose :id, :name, :email
+    end
+  end
+end