Rails 3自定义验证器问题 [英] Rails 3 Custom Validator Problem

问题描述

我需要对模型应用验证，使记录中的2个整数值，最小值和最大值形成一个包含范围（例如2和3是确定的，但4和1不是）。从我的理解，因为我需要验证在同一记录中的两个值，我必须使用ActiveModel :: Validator（而不是ActiveModel :: EachValidator）。所以，我尝试以下：

模型（app / models / position.rb）：

  class Position< ActiveRecord :: Base 
 validates_with InclusiveRangeValidator 
 end 
  

验证器（app / lib / validators / inclusive_range_validator.rb）：

  class InclusiveRangeValidator< ActiveModel :: Validator 
 def validate（record）
 record.errors [：base]< ＃{record.minimum}和＃{record.maximum}不构成有效的包含范围。除非记录record.maximum 
 end 
 end 
  

我读过Rails 3.0。 5不会自动加载lib目录，所以我在config / application.rb中添加了这一行：

  config.autoload_path + =％W（{config.root} / lib）
  

然后我重置rails服务器它会改变到config / application.rb。我运行我的单元测试，试图锻炼模型来证明这种验证工作。我收到此错误：

 未初始化的常量：Position :: InclusiveRangeValidator（NameError）
  
 
 
 
我认为发生的是Rails不能识别/找到我的自定义验证器类，因此它假定InclusiveRangeValidator是它引用的类中的一个常量但是，我认为我对config / application.rb的更改会将我的验证器放在加载路径，以便它可用。
 
 
 
我已经走了通过StackOverflow上的其他帖子，没有提出一个解决方案，我已经阅读API文档验证器，无济于事。我必须做一些简单而愚蠢的事情，但我看不出问题是什么。任何帮助？
 
 
 
  EDIT ：
经过更多搜索，我发现我根本不需要自定义验证器我可以用这个完成同样的目标：
  validates：minimum，：numericality => {：greater_than_or_equal_to => 0} 
 validates：maximum，：numericality => {：greater_than => ：minimum} 
  
但是，Rails无法找到自定义验证类。
解决方案
一次，我将application.rb中的行更改为：
  config.autoload_paths + =％W [＃{config.root} / lib / validators /] 
  
 Rails能够找到加载我的自定义验证器的正确路径。我犯了一个错误，假设Rails会自动递归目录结构，这显然不是这样。
 
I need to apply validation to a Model so that 2 integer values in the record, minimum and maximum, form an inclusive range (ex. 2 and 3 are ok, but 4 and 1 are not).  From what I understand, since I need to validate 2 values against each other in the same record, I have to use ActiveModel::Validator (and not ActiveModel::EachValidator).  So, I try the following:

Model (app/models/position.rb):
class Position < ActiveRecord::Base
  validates_with InclusiveRangeValidator
end
Validator (app/lib/validators/inclusive_range_validator.rb):
class InclusiveRangeValidator < ActiveModel::Validator
  def validate(record)
    record.errors[:base] << "#{record.minimum} and #{record.maximum} do not form a valid inclusive range." unless record.minimum < record.maximum
  end
end
I've read that Rails 3.0.5 doesn't automatically load the lib directory anymore, so I added this line in config/application.rb:
config.autoload_path += %W({config.root}/lib)
And then I reset the rails server so it'll take the change to config/application.rb.  I run my unit tests, which tries to exercise the model to prove this validation works.  I get this error:
uninitialized constant: Position::InclusiveRangeValidator (NameError)
What I think is happening is that Rails is not recognizing/finding my custom validator class, and so it assumes InclusiveRangeValidator is a constant in the class that it's referenced in.  But, I thought the change I made to config/application.rb would put my validator in the load path so that it would be available.

I've gone through the other posts on StackOverflow and didn't come up with a solution, and I've read the API docs on validators, to no avail.  I've got to be doing something simple and stupid, but I can't see what the issue is.  Any help?

EDIT:
After more searching, I discovered that I don't need a custom validator at all, as I can accomplish the same goal with this:
validates :minimum, :numericality => {:greater_than_or_equal_to => 0 }
validates :maximum, :numericality => {:greater_than => :minimum }
However, the question still remains as to why Rails can't locate the custom validation class.
解决方案
Once, I changed the line in application.rb to:
config.autoload_paths += %W[#{config.root}/lib/validators/]
Rails was able to find the right path to load my custom validator.  I made the mistake of assuming Rails would automatically recurse the directory structure, this is evidently not the case.

                        
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