Mongoid：如何让 Mongoid 识别我的自定义 ActiveModel 验证？
我有一个模型，其中包含名称数组，我想确保只有一个文档可以具有给定名称。我正在尝试编写一个自定义验证来处理这个问题。我的自定义验证和模型目前看起来像这样：
lib/unique_name_validator.rb
class UniqueNamesValidator < ActiveModel::EachValidator
def validate_each( record, attribute, value )
end
end
app/models/MyModel.rb
class MyModel
include Mongoid::Document
validates :names, :unique_names => true
field :names, :type => Array
end
但我收到未知验证器：“unique_names”（ArgumentError）。 Mongoid 文档说每个模型都包含 ActiveModel::Validation，我认为这将允许它们使用我的自定义验证。我还尝试进行从 ActiveModel::Validator 继承的验证并使用 validates_with，但这也不起作用。
I have a model, which has and array of names and I want to ensure that only one document can have a given name. I'm trying to write a custom validation to handle this. My custom validation and the model look like this at the moment:
lib/unique_name_validator.rb
class UniqueNamesValidator < ActiveModel::EachValidator
def validate_each( record, attribute, value )
end
end
app/models/MyModel.rb
class MyModel
include Mongoid::Document
validates :names, :unique_names => true
field :names, :type => Array
end
But I'm getting Unknown validator: 'unique_names' (ArgumentError). The Mongoid documentation says that each model includes ActiveModel::Validation, which I thought would allow them to work with my custom validations. I've also tried making validation that inherits from ActiveModel::Validator and using validates_with, but that doesn't work either.
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如果您使用的是 Rails 3，则可能不会自动从 lib 下获取 unique_name_validator.rb，除非您在 application.rb 中添加以下内容：
If you're using Rails 3, your unique_name_validator.rb may not be picked up from under lib automatically unless you add the following in application.rb:
自定义验证适用于我的 mongoid，但我需要从我的模型文件中要求它：
也许有一种方法可以配置 Rails/mongoid 以自动选取自定义验证器？
The custom validation works for me with mongoid, but I needed to require it from my model file:
Perhaps there is a way to configure rails/mongoid to automatically pick up custom validators?
自动加载 application.rb 中的 lib 文件
config.autoload_paths += %W(#{config.root}/lib)或将
unique_name_validator.rb放到initializer< /代码> 文件夹Either autoload lib file in application.rb
config.autoload_paths += %W(#{config.root}/lib)Or drop
unique_name_validator.rbtoinitializerfolder为了唯一性，请使用：
validates_uniqueness_of（来自 http://mongoid.org/docs/validation /)
validates_each也可以工作。For uniqueness, use:
validates_uniqueness_of(From http://mongoid.org/docs/validation/)
validates_eachworks too.