英文:
Unmarshal XML to struct and convert to slice
问题
我在Golang中有一个简单的项目，用来学习这门语言。我正在开发的"service"的主要目的是运行一个守护进程，将以XML形式暴露的URL保存起来。这样我就可以"生成"自己的稍后阅读服务。目前为止一切顺利。你可以在这里找到这个项目：https://github.com/rogierlommers/readinglist-golang
我正在使用Gin-Gonic作为提供HTML的框架。我已经成功读取了一个XML文件，并将其解组，但现在我想向这个"thing"中添加一些新数据。换句话说，我认为我需要将其转换为一个切片，但我不知道如何处理。
例如，端点r.GET("/add/:url")应该使用函数util.AddRecord将新的URL插入到切片中。但是怎么做呢？
[编辑]
基本上，我的问题可以在这个Go Playground中查看：http://play.golang.org/p/Vx0s02E12R
英文:
I have a simple project in Golang which I use to learn this language. Main purpose of the "service" which I'm developing is to run a daemon to save URLs which are exposed as XML. This way I can "produce" my own read-later service. So far so good :). You can find the project here: https://github.com/rogierlommers/readinglist-golang
I'm using Gin-Gonic as the framework for serving html. I've already managed to read an xml file, unmarshal it but now I want to add some new data into this "thing". In other words: I think I need to convert it into a slice, but I don't know how to manage this.
F.e. the endpoint r.GET("/add/:url") should use the function util.AddRecord to insert the new url into the slice. But how?
[edit]
Basically my problem can be viewed in this go playground: http://play.golang.org/p/Vx0s02E12R
答案1
得分: 2
在你的问题评论中，你问道：
> 我首先需要创建一个切片，对吗？
答案是肯定的，但是你已经在你的ReadingListRecords结构体中有一个切片：
<!-- language-all: lang-go -->
type ReadingListRecords struct {
XMLName xml.Name `xml:"records"`
Records []Record `xml:"record"`
}
所以，你可以简单地在该切片上调用append函数，并传入一个新的记录结构体：
records.Records = append(record.Records, Record{xml.Name{"", "record"}, 4, "url", "2015-03-09 00:00:00"})
你还可以扩展ReadingListRecords结构体的API，以包含一个方便的Append函数：
type RecordSet interface {
Append(record Record) error
}
func (records *ReadingListRecords) Append(record Record) error {
newRecords := append(records.Records, record)
if newRecords == nil {
return errors.New("Could not append record")
} else {
records.Records = newRecords
return nil
}
}
添加一个接口似乎是个好主意，因为你想在多个应用程序中使用它作为服务。
英文:
In a comment on your question you asked:
> I first need to create a slice, right?
The answer is yes, but you already have a slice in your ReadingListRecords struct:
<!-- language-all: lang-go -->
type ReadingListRecords struct {
XMLName xml.Name `xml:"records"`
Records []Record `xml:"record"`
}
So, you can simply call append on that slice and pass in a new record struct:
records.Records = append(record.Records, Record{xml.Name{"", "record"}, 4, "url", "2015-03-09 00:00:00"})
You could also expand the API for your ReadingListRecords structure to include a handy Append function:
type RecordSet interface {
Append(record Record) error
}
func (records *ReadingListRecords) Append(record Record) error {
newRecords := append(records.Records, record)
if newRecords == nil {
return errors.New("Could not append record")
} else {
records.Records = newRecords
return nil
}
}
Adding an interface seems like a good idea since you would like to use this as a service in multiple applications.
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