用Nokogiri :: XML :: Builder忽略空节点的最干净方法是什么

本文介绍了用Nokogiri :: XML :: Builder忽略空节点的最干净方法是什么的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

因此，假设我有一个类似于以下内容的构建器模板：

So let's say I have a builder template like the following:

builder = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml| xml.environment do |environment| environment.title title environment.feed feed environment.status status environment.description description # many many more end end builder.to_xml

如果 feed 和描述为 nil ，则可能输出：

If feed and description were nil, it could output:

<?xml version="1.0" encoding="UTF-8"?> <environment> <title>title</title> <feed/> <status>status</status> <description/> </environment>

我宁愿它完全忽略指甲。 实现此目标的最佳方法是什么？

I'd rather it ignored the nils altogether. What's the best way of achieving this?

所需的输出：

<?xml version="1.0" encoding="UTF-8"?> <environment> <title>title</title> <status>status</status> </environment>

当前解决方案：

builder = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml| xml.environment do |environment| environment.title title if title environment.feed feed if feed environment.status status if status environment.description description if description # many many more end end builder.to_xml

是否有更清洁的方法？

Is there a cleaner way?

这对Builder＃initialize有用吗？

Would this be a useful option on Builder#initialize?

builder = Nokogiri :: XML :: Builder.new（：encoding =>'UTF-8'，：empty_nodes => false）

推荐答案

这取决于您实际上拥有多少个字段，，但我的建议是，您已经通过手动输入每个字段来犯错。

It depends how many fields you really have, but my suggestion is that you're already making a mistake by manually typing in each one.

如果顺序无关紧要，只需使用哈希即可。 （否则使用OrderedHash）

If order doesn't matter, just use a hash. (otherwise use an OrderedHash)

fields = { :title => title, :feed => feed, :status => status, :description => description, # many more } builder = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml| xml.environment do |environment| fields.each do |field_name, field_value| if field_value environment.send(field_name, field_value) end end end end builder.to_xml

似乎可以正常工作。

虽然不漂亮，但至少您只需要在一个地方定义字段和值即可。 最好是对象方法吗？

It's not pretty, but at least you just have to define your fields and values in one place. Preferably an object method?