什么是Ruby on Rails中的MVC？ [英] What is MVC in Ruby on Rails?
问题描述
MVC是（复合）设计模式，1979年由Trygve Reenskaug（Smalltalk）开发。
真正的MVC主要用于n层（非网络）系统，它将系统分为3个不同的部分，一个模型，视图和控制器
模型
- 包含应用程序的数据（通常链接到数据库） li>
- 包含应用程序的状态（例如客户的订单）
- 包含所有业务逻辑
- 通知查看状态更改（**不适用于ROR，请参见下文）
- 不了解用户界面，因此可以重复使用
查看
- 生成向用户显示数据的用户界面
- 被动，即不进行任何处理
- 一旦数据显示给用户，视图工作就会完成。
- 视图可以访问相同的模型，因为不同的原因
控制器
- 从外界接收事件， d（通常通过视图）
- 与模型交互
- 向用户显示适当的视图
**经典MVC不适合于Web应用程序，因为模型不能以观察者的方式发送所有对视图的更改（视图是一个网页）。引入Model2来克服JSP团队在90年代改变基础设施。 MVC Web框架真的不是MVC，但是Model2（Ruby on Rails是这样的）。
这是一个GUI模式的描述，包括来自主人的MVC，Martin Fowler
GUI架构
我迄今为止发现的最好的书是敏捷网页使用Rails开发。它开始于假设没有知识，而且是相当全面的。
希望这有助于为您带来一些光明！
Could someone please explain MVC to me in Ruby on Rails, in layman terms. I am especially interested in understanding the Model in MVC (can't get my head around the model).
Some background, MVC is a (compound) design pattern and was developed in 1979 by Trygve Reenskaug (Smalltalk).
True MVC was primarily planned for use in n-tier (non web) systems and it splits a system into 3 distinct parts, a Model, View and Controller
The Model
- Contains data for the application (often linked to a database)
- Contains state of the application (e.g. what orders a customer has)
- Contains all business logic
- Notifies the View of state changes (** not true of ROR, see below)
- No knowledge of user interfaces, so it can be reused
The View
- Generates the user interface which presents data to the user
- Passive, i.e. doesn’t do any processing
- Views work is done once the data is displayed to the user.
- Many views can access the same model for different reasons
The Controller
- Receive events from the outside world (usually through views)
- Interact with the model
- Displays the appropriate view to the user
** Classic MVC is not suited to web applications, as the model cannot send all changes to the view in an observer fashion (the view is a web page). The Model2 was introduced to overcome the changing infrastructure by JSP team in 90s . MVC Web frameworks are really not MVC, but Model2 (this is true of Ruby on Rails).
Here is a description of GUI patterns including MVC from the master, Martin Fowler GUI Architectures
The best book I have found so far is Agile Web Development with Rails. It begins by assuming no knowledge, and is quite comprehensive.
Hope this helps to shed some light for you!
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