英文:
Unmarshalling XML child array into direct Go struct array
问题
我有一个像这样的XML对象：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<directory count="2">
<entries>
<entry name="Alice"/>
<entry name="Bob"/>
</entries>
</directory>
现在我想将其解析为一个类似于以下结构的Go结构体：
type Entry struct {
XMLName xml.Name `xml:"entry"`
Name string `xml:"name,attr"`
}
type Directory struct {
XMLName xml.Name `xml:"directory"`
Count string `xml:"count,attr"`
Entries []Entry `xml:"entries>entry"`
}
如你所见，我希望Entries是Directory的直接子元素。但是这样不起作用，Directory.Entries始终为空。
但是，当我添加某种代理对象时，它确实起作用（从一个XML->Go结构体转换器在这里找到）：
type Directory struct {
XMLName xml.Name `xml:"directory"`
Text string `xml:",chardata"`
Count string `xml:"count,attr"`
Entries struct {
Text string `xml:",chardata"`
Entry []struct {
Text string `xml:",chardata"`
Name string `xml:"name,attr"`
} `xml:"entry"`
} `xml:"entries"`
}
在这个版本中，数组被填充，我可以通过Directory.Entries.Entry[i]访问给定索引i处的条目。
如何省略这里的不必要对象，并通过Directory.Entries[i]直接访问条目？是否可以在不构建自定义（反）编组器的情况下实现？
英文:
I have an XML object like this:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<directory count="2">
<entries>
<entry name="Alice"/>
<entry name="Bob"/>
</entries>
</directory>
Now I want to parse this into a Go struct that looks like this:
type Entry struct {
XMLName xml.Name `xml:"entry"`
Name string `xml:"name,attr"`
}
type Directory struct {
XMLName xml.Name `xml:"directory"`
Count string `xml:"count,attr"`
Entries []Entry `xml:"entries"`
}
As you can see, I'd like Entries to be a direct child of Directory. This does not work, Directory.Entries is always empty.
It does however work when I add some kind of proxy object like this (got this from an XML->Go struct converter found here):
type Directory struct {
XMLName xml.Name `xml:"directory"`
Text string `xml:",chardata"`
Count string `xml:"count,attr"`
Entries struct {
Text string `xml:",chardata"`
Entry []struct {
Text string `xml:",chardata"`
Name string `xml:"name,attr"`
} `xml:"entry"`
} `xml:"entries"`
}
In this version, the array gets filled and I can access a given entry at index i via Directory.Entries.Entry[i].
How can I omit the unneccessary object here and access the entries directly via Directory.Entries[i]? Is it possible without building a custom (un)marshaller?
答案1
得分: 1
你在xml定义的entries集合中缺少了parent>child>plant标签>：
Entries []Entry `xml:"entries>entry"`
去玩吧：https://go.dev/play/p/4SZT8-S8BFF
英文:
You're missing the parent>child>plant tag > from the xml definition on the entries collection:
Entries []Entry `xml:"entries>entry"`
Go Play: https://go.dev/play/p/4SZT8-S8BFF
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