Golang, parsing xml to struct? - go

Question

I have such xml document and I need to get an array of DATA. I cannot solve this simple task for 4 hours.... want back to node.js :-)
<?xml version="1.0" standalone="no"?>
<RETS ReplyCode="0" ReplyText="Operation Successful" >
<COUNT Records="58951" />
<DELIMITER value="09"/>
<COLUMNS> LN </COLUMNS>
<DATA> 09361303 </DATA>
<DATA> 09333085 </DATA>
<MAXROWS/>
type DATA struct {
DATA string `xml:"DATA"`
}
type Rets struct {
DATA []DATA `xml:"RETS>DATA"`
}
data := &Rets{}
decoder := xml.Unmarshal(body,&data)
fmt.Println(decoder)

Answer 1

There are a couple of tools for turning XML into Go structs. One that is suitable for reading is zek (try it online), and although it is experimental, it can deal with a couple of common XML constructs already.
You can go from a XML file (raw) to a struct with a simple command:
$ curl -sL https://git.io/fN4Pq | zek -e -p -c
This will create a struct plus an example program for testing out the marshalling (the example does very little, it read XML from stdin and turns it into JSON).
Here is an example struct (for some XML take from this repo):
// RETS was generated 2018-09-07 12:11:10 by tir on apollo.local.
type RETS struct {
XMLName xml.Name `xml:"RETS"`
Text string `xml:",chardata"`
ReplyCode string `xml:"ReplyCode,attr"`
ReplyText string `xml:"ReplyText,attr"`
METADATATABLE struct {
Text string `xml:",chardata"`
Resource string `xml:"Resource,attr"`
Class string `xml:"Class,attr"`
Version string `xml:"Version,attr"`
Date string `xml:"Date,attr"`
COLUMNS string `xml:"COLUMNS"` // MetadataEntryID SystemNam...
DATA []string `xml:"DATA"` // 7 City City Ci ...
} `xml:"METADATA-TABLE"`
}
Disclaimer: I wrote zek.

Answer 2

From the xml.Unmarshal docs
If the XML element contains character data, that data is
accumulated in the first struct field that has tag ",chardata".
The struct field may have type []byte or string.
If there is no such field, the character data is discarded.
Use
type DATA struct {
DATA string `xml:",chardata"`
}
type Rets struct {
DATA []DATA `xml:"DATA"`
}
Or in this simple case, you can just use
type Rets struct {
DATA []string `xml:"DATA"`
}
Which collects the charadata from a list of elements by default