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今天呢，我们来说一个主题

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我们来谈一谈

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实现领域驱动设计

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这本书的中译本

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的译文背后暴露的问题

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可能要分很多个视频来谈

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首先，要先说在前面的

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就是说

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为什么我要批评这个书的翻译

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起源

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在2019年的时候

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我已经写文章批评过这个书了

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当时是什么

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就是

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有人去捧这个书

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翻译翻得好什么之类的

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我们前面也讲了

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是你主动过界

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是被人推着过界也好

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如果产生后果

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那我们就要批评

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我们

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评点的

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第一个，是以第10章的第1段开头的

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那为什么是第10章的第1段，不是按顺序这样来

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是不是前面没问题

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然后你找了半天就挑出第10章

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有毛病

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不是这样的

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到处都有毛病

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你不信

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我们后面还可以继续讲整本书的第1段有什么问题

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这个我都已经写了文章了

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而且写了一大堆（口误：篇）文章

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光这一段的话

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我就啪啪啪啪写了很多

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这里面有什么问题

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还有第1章第1段

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这里表达有什么问题

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译者这样写有什么不对

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都可以讲

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但是我们为什么要以第10章这个来讲

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因为第10章的内容，我之前写过

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文章的

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而这个文章本身是从别的文章引用到了相关的知识

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所以顺便就写了第10章这个地方的一些知识点

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那个素材是现成的

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所以我就先把已经有的那个内容先做成视频

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后面有时间我们可以

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有时间

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如果大家感兴趣

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我们可以慢慢来评点

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背后有什么问题

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那这个评点里面，重点不是英文、中文或者翻译问题

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是软件开发知识问题

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并不是说我软件开发其实很牛

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我中文差或英文差

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翻译错了

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如果是这样

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那还可以理解

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但暴露的问题

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很可能并不是什么英文中文的问题

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最后再声明

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就是说，我批评这个译文

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不代表我赞同原文

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并不是说，领域驱动设计

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中国人写的就批评

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如果是老外写的

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就赞同

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不是这样的

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这整个圈子里面就是很多很多的伪创新

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特别很多造词都是老外造出来的

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来霍霍大家

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国内的人只是跟风而已

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不代表我赞同原文

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当然

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从这个书的质量来说

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Vernon这个书的用词

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包括这个知识的表达上

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要比Evans的那本书

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要严谨

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这我在几个文章里面也提到过的

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或者说，这两个作者相比

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Vernon的水平

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要更高一点

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素养

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要更加扎实

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那首先我们先来看这个第10章

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aggregates正文的第1段

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上面是

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原文

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下面是中译本的译文

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中译本的这里

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我加了一个下划线

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这是第一个

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第一句要评点的

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这是第二句要评点的

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我们来看看

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原文是这样

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翻译是这样

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原文是这样

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翻译是这样

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那我们看，这个翻译背后

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暴露出什么样的问题呢

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我们一个一个来看

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我们先来看

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第一个

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第一个，原文是这样说的

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译文是这样说的

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这里面的问题呢

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有这么两个

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第一个

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共享父类

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的对象

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这样的说法

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是有问题的

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还有呢，对象树

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这样的说法也是有问题的

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跟原文

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首先，原文没有

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这是译者臆想出来的

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这个臆想背后就暴露出了一些

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在知识上的

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认识上的一些问题

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第二个，关联

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这里没有说关联

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原文没有说关联

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只是说相关，结果呢

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译者就把它说成了关联

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这两个不是一回事

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那我们一个一个来看

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第一个

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共享父类的对象，对象树

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那这样的翻译

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或者这样的表达

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混淆了类和对象的区别

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译者

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可能分不清类和对象

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分不清集合和个体

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他误以为这个Parent

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这个是父类

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或者说超类

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实际上是整体对象，是一个对象

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产生这样的误认之后呢

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他就臆想出共享父类

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共享父类

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就是继承或者泛化的一棵树

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如果超类只有一个的话

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单继承的话

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继承的形状就是一棵树

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所以呢，他就臆想出一个

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对象树

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这样的一个概念

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但实际上原文根本就没有这个

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这个是整体对象的意思

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而且这里说的是什么

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图

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对象图

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不是对象树

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那说到这个

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我们就要把道理给讲一讲

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我们通常说到一个概念

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往往它有两个含义

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第一个

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它代表的是所有实例的集合

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比如说，动物有鼠有鸭

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这个就是一个集合的关系

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动物有鼠有鸭

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意思并不是说，一个动物

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我随便挑一个动物

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比如说

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就拿我来说

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然后我是由一只老鼠

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若干只老鼠跟若干只鸭组装而成的

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不是的

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它是说集合

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动物实例的集合

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就包含了鼠的实例的集合

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以及鸭的实例的集合

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这是集合的包含

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第二个

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它有可能是指代

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集合中的任意一个实例

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比如说，鼠有头有颈

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这个就不是集合了

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并不是说

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老鼠的集合

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包含了所有头和脖子的集合

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或者说，头跟脖子是老鼠的一种

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不一定，没准这个脖子是

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是属于

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属于鸭的脖子

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对不对

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人也有脖子

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对吧

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头，人也有头

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对吧

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鼠有头有颈，是什么意思

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你随便，任意挑出一个老鼠的实例

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比如说

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它

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我敢肯定，它是有头有脖子的

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它是个体的组装

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一只老鼠

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它是由若干个头，若干个脖子组成的

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当然，我们这里若干，一般老鼠都是1了

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一个头，一个脖子组成的

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它是个体的组装

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显然

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我们说的聚合组合关系

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比如说，汽车

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有四个轮子

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有一个发动机

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有两扇门什么之类的

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这是个体的关系，还是集合关系

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这是个体的关系

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对不对

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它是对象级别的，你指定任何一个汽车

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它是由一个发动机、四个轮子什么之类组装而成的

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而译者怎么样

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就把它混淆成了集合关系了

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以为是说共享父类

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那是动物

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有鼠有鸭，这个才是的

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那我们用图来表示一下

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大家看得更清楚

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你看

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BC

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泛化到A或者BC继承A

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含义是什么

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A的实例集合或者A的对象集合

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包含了BC的对象集合

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对不对

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而个体是什么

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A关联到BC，意味着什么

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A里面的个体

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和BC里面的个体

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发生了关系

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只有个体的关系

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才会有一对多、多对多之类的

87
00:03:55,600 --> 00:03:57,899
集合哪里有什么一对多、多对多

88
00:03:57,899 --> 00:03:58,430
对不对

89
00:03:58,710 --> 00:04:00,240
本来它是一个集合

90
00:04:02,960 --> 00:04:05,740
而聚合组合就相当于什么

91
00:04:06,020 --> 00:04:09,929
这个BC的个体就把它装到A的个体里面去了

92
00:04:09,929 --> 00:04:12,350
就把它看作是A里面的一部分

93
00:04:12,830 --> 00:04:13,092

94
00:04:13,092 --> 00:04:14,930
但它的类型是

95
00:04:15,310 --> 00:04:16,550
B和C

96
00:04:20,390 --> 00:04:21,370
所以呢

97
00:04:22,060 --> 00:04:24,290
译者想象的树

98
00:04:24,290 --> 00:04:26,520
实际上是类的树

99
00:04:29,190 --> 00:04:31,041
转成对象集合的表达

100
00:04:31,041 --> 00:04:33,920
实际上它是一个集合的关系

101
00:04:33,920 --> 00:04:35,360
根本就不是什么

102
00:04:35,740 --> 00:04:37,540
不是一个老鼠

103
00:04:37,540 --> 00:04:40,240
有脖子，有头，这个关系

104
00:04:40,240 --> 00:04:42,640
那是个体的关系

105
00:04:46,160 --> 00:04:48,130
他把这两个搞混了

106
00:04:48,570 --> 00:04:48,855

107
00:04:48,855 --> 00:04:52,854
所以才会衍生出什么对象树

108
00:04:52,854 --> 00:04:55,710
类似这样的一些表达

109
00:05:00,480 --> 00:05:03,200
那什么样的表达是合适的

110
00:05:03,570 --> 00:05:05,278
上面三个都可以

111
00:05:05,278 --> 00:05:06,010
比如说

112
00:05:06,290 --> 00:05:07,960
共享父类的类

113
00:05:09,000 --> 00:05:12,480
这可以，比如说鼠和鸭

114
00:05:13,000 --> 00:05:15,330
它们的父类都是动物

115
00:05:16,590 --> 00:05:18,430
这可以

116
00:05:20,680 --> 00:05:22,849
或者说，类的对象，可以

117
00:05:22,849 --> 00:05:23,500
比如说

118
00:05:24,620 --> 00:05:26,620
对象9527

119
00:05:26,940 --> 00:05:29,290
是一个鼠的对象

120
00:05:29,950 --> 00:05:30,360

121
00:05:30,360 --> 00:05:32,820
对象666是

122
00:05:33,130 --> 00:05:34,370
鸭的对象

123
00:05:34,660 --> 00:05:34,841

124
00:05:34,841 --> 00:05:36,471
就是说，它是一只老鼠

125
00:05:36,471 --> 00:05:37,740
它是一只鸭子了

126
00:05:38,020 --> 00:05:39,240
这个也可以

127
00:05:39,940 --> 00:05:43,596
或者说共享父类的类的对象

128
00:05:43,596 --> 00:05:46,128
这个虽然有点别扭

129
00:05:46,128 --> 00:05:47,816
但是也可以的

130
00:05:47,816 --> 00:05:48,660
比如说

131
00:05:49,190 --> 00:05:53,880
我家里面开了一个小小的动物园

132
00:05:54,410 --> 00:05:56,860
动物园里面呢有

133
00:05:57,950 --> 00:05:59,480
两只老鼠

134
00:05:59,760 --> 00:06:00,031

135
00:06:00,031 --> 00:06:00,846
一只鸭

136
00:06:00,846 --> 00:06:03,290
这样也能说得通

137
00:06:06,240 --> 00:06:09,197
但是不能直接说共享父类的对象

138
00:06:09,197 --> 00:06:10,380
这是不对的

139
00:06:11,020 --> 00:06:12,160
对象怎么共享父类

140
00:06:12,160 --> 00:06:14,440
对象的本身就是一个类

141
00:06:14,820 --> 00:06:17,156
只能是一个类的实例

142
00:06:17,156 --> 00:06:17,740
对不对

143
00:06:18,020 --> 00:06:20,379
你可以说，这个类又属于另外一个类的（子类）

144
00:06:20,379 --> 00:06:21,490
你说，我是一只老鼠

145
00:06:21,810 --> 00:06:22,041

146
00:06:22,041 --> 00:06:23,660
这个没问题

147
00:06:25,110 --> 00:06:25,734
然后呢

148
00:06:25,734 --> 00:06:28,647
老鼠这个概念，它属于动物的一种

149
00:06:28,647 --> 00:06:29,479
那是什么

150
00:06:29,479 --> 00:06:31,560
那是类级别上的

151
00:06:31,860 --> 00:06:33,710
你说，你是哪个类的对象

152
00:06:33,710 --> 00:06:36,855
就是那个，不存在共享父类的对象这些说法

153
00:06:36,855 --> 00:06:38,890
没有这个的

154
00:06:44,370 --> 00:06:45,620
这是第一个了

155
00:06:46,260 --> 00:06:49,770
那第二个问题就是说关联的问题

156
00:06:49,770 --> 00:06:52,110
那这个我们下期再说了