README.md in meta-api-0.0.2 vs README.md in meta-api-0.0.3

@@ -15,19 +15,21 @@
 ## 安装
 
 在 Gemfile 中添加：
 
 ```ruby
-gem 'meta-api', '~> 0.0.1' # Meta 框架处于快速开发阶段，引入时应尽量固定版本
+gem 'meta-api', '~> 0.0.3' # Meta 框架处于快速开发阶段，引入时应尽量固定版本
 ```
 
 然后在 Ruby 代码中引用：
 
 ```ruby
 require 'meta/api'
 ```
 
+> 或者可嵌入到 Rails 项目中使用，参见[为 Rails 项目带来参数验证效果](docs/Rails.md)。
+
 ## 快速上手
 
 ### 定义 API
 
 通过继承 `Meta::Application` 来定义一个 API 模块。（PS：以下示例的运行依赖 `ActiveRecord`）
@@ -35,24 +37,24 @@
 ```ruby
 class NotesAPI < Meta::Application
   get '/notes' do
     title '查看笔记列表'
     status 200 do
-      expose :notes, type: 'array', using: NoteEntity
+      expose :notes, type: 'array', ref: NoteEntity
     end
     action do
       render :notes, Note.all
     end
   end
 
   post '/notes' do
     title '创建新的笔记'
     params do
-      param :note, type: 'object', using: NoteEntity
+      param :note, type: 'object', ref: NoteEntity
     end
     status 201 do
-      expose :note, type: 'object', using: NoteEntity
+      expose :note, type: 'object', ref: NoteEntity
     end
     action do
       note = Note.create!(params[:note])
       response.status = 201
       render :note, note, scope: 'full'
@@ -63,24 +65,24 @@
     title '查看笔记'
     params do
       param :id, type: 'integer'
     end
     status 200 do
-      expose :note, type: 'object', using: NoteEntity
+      expose :note, type: 'object', ref: NoteEntity
     end
     action do
       note = Note.find(params[:id])
       render :note, note, scope: 'full'
     end
   end
 
   put '/notes/:id' do
     title '更新笔记'
     params do
-      param :note, type: 'object', using: NoteEntity
+      param :note, type: 'object', ref: NoteEntity
     end
     status 200 do
-      expose :note, type: 'object', using: NoteEntity
+      expose :note, type: 'object', ref: NoteEntity
     end
     action do
       note = Note.find(params[:id])
       note.update!(params[:note])
       render :note, note, scope: 'full'