NameError：未初始化的常量 ActiveRecord::Associations::Builder::XMLMarkup
我发现一篇标题与此非常相似的帖子，但它没有给我我正在寻找的答案。 我正在尝试在模型中使用构建器。代码看起来像这样：
require 'builder'
class Document < ActiveRecord::Base
...
def create_xml
xml = Builder::XmlMarkup.new( :indent => 2)
...
end
...
end
当我尝试执行此代码时，出现以下错误：
NameError: uninitialized constant ActiveRecord::Associations::Builder::XMLMarkup
但是，当我在 Rails 控制台中尝试相同的操作时，一切正常。
我错过了什么吗？任何帮助将不胜感激。
I found a post with a headline quite similar to this one, but it didn't give me the answer I was looking for.
I am trying to use builder inside a model. The code looks something like this:
require 'builder'
class Document < ActiveRecord::Base
...
def create_xml
xml = Builder::XmlMarkup.new( :indent => 2)
...
end
...
end
When I try to execute this code, I get the following error:
NameError: uninitialized constant ActiveRecord::Associations::Builder::XMLMarkup
But, when I try the same thing within the rails console, everything works just fine.
Am I missing something? Any help would be much appreciated.
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找到了答案。
您必须将 Builder 附加到根级别，如下所示：
Found the answer.
You have to append Builder to the rootlevel, like this: