Ruby优化继承类实例

在Rails的原则里有简化Controller，丰富Model的说法。下面将用一个示例展示一个简单的继承优化。特别是你的method里有一个写变化的self变量的时候。

假设我们有如下的Model

class SubjectMatterExpert < User  

 include HashCodeCreatorModule  

 def make_activation_code  

   self.deleted_at = nil  

   self.activation_code ||= make_hash_code  

 end  

end  

  

class Administrator < User  

 include HashCodeCreatorModule  

 def make_activation_code  

   self.deleted_at = nil  

   self.activation_code ||= make_hash_code  

 end  

end

我们可以通过继承的使用简化代码如下SubjectMatterExpert Administrator

class SubjectMatterExpert < User  

end  

  

class Administrator < User  

end  

  

class User  

 include HashCodeCreatorModule  

 def make_activation_code  

   self.deleted_at = nil  

   self.activation_code ||= make_hash_code  

 end

那么我们也可以在测试中这么使用：

it 'should create an activation code' do  

  admin = Factory(:administrator)  

  admin.make_activation_code  

  admin.activation_code.should_not be_empty  

end

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