I have a problem where an API returns two nested XML arrays in a response both with the name rowset but different elements. Trying to unmarshal into a struct causes the error field "Attackers" with tag "rowset>row" conflicts with field "Items" with tag "rowset>row".
They both have an attribute name which are unique. Is it possible to influence the parser with this attribute?
See example: https://play.golang.org/p/BinDfC3XsW
If you can't change the structure of xml data, then defer unmarshaling rowset with the following steps (Working example can be found at Go Playground):
rowset which are related to victim. During this step, the rowset will be unmarshaled into raw XML data.Decoder.DecodeElement.First declare the data structure as follows (declaration of Victim, Attacker, Item is omitted):
type Kill struct{
// Generic kill information
KillID int64 `xml:"killID,attr"`
Hash string
SolarSystemID int64 `xml:"solarSystemID,attr"`
MoonID int64 `xml:"moonID,attr"`
// Victim Information
Victim Victim `xml:"victim"`
RawAttackersItems []byte `xml:",innerxml" json:"-"`
Attackers []Attacker `xml:"-"`
Items []Item `xml:"-"`
}
type Kills struct {
Kills []Kill `xml:"result>rowset>row"`
}
Next, code lines for unmarshaling the xml:
//Step (1). Unmarshal to Kills
v := &Kills{}
if err := xml.Unmarshal([]byte(xmlText()), v); err != nil {
fmt.Printf("Error unmarshaling: %v
", err)
return
}
//Step (2). Decode attackers and items related to victim
for i, k := range v.Kills {
v.Kills[i].Attackers, v.Kills[i].Items = decodeAttackerAndItems(k.RawAttackersItems)
}
and finally the decoder function:
func decodeAttackerAndItems(data []byte) ([]Attacker, []Item) {
xmlReader := bytes.NewReader(data)
decoder := xml.NewDecoder(xmlReader)
const (
unknown int = iota
attackers
items
)
rowset := unknown
attackerList := []Attacker{}
itemList := []Item{}
for {
t, _ := decoder.Token()
if t == nil {
break
}
switch se := t.(type) {
case xml.StartElement:
if se.Name.Local == "rowset" {
rowset = unknown
for _, attr := range se.Attr {
if attr.Name.Local == "name" {
if attr.Value == "attackers" {
rowset = attackers
break
} else if attr.Value == "items" {
rowset = items
break
}
}
}
} else if se.Name.Local == "row" {
switch rowset {
case attackers:
a := Attacker{}
if err := decoder.DecodeElement(&a, &se); err == nil {
attackerList = append(attackerList, a)
}
case items:
it := Item{}
if err := decoder.DecodeElement(&it, &se); err == nil {
itemList = append(itemList, it)
}
}
}
}
}
return attackerList, itemList
}
This works fine, try it on The Go Playground:
package main
import (
"encoding/xml"
"fmt"
)
func main() {
var v *KillMailsXML
if err := xml.Unmarshal([]byte(str), &v); err != nil {
panic(err)
}
for _, ks := range v.Kills {
for _, rs := range ks.Rowsets {
fmt.Println(rs.Who, rs.Rows)
}
}
}
type KillMailsXML struct {
Kills []struct {
// Generic kill information
KillID int64 `xml:"killID,attr"`
Hash string
SolarSystemID int64 `xml:"solarSystemID,attr"`
MoonID int64 `xml:"moonID,attr"`
// Victim Information
Victim struct {
AllianceID int64 `xml:"allianceID,attr"`
AllianceName string `xml:"allianceName,attr"`
CharacterID int64 `xml:"characterID,attr"`
CharacterName string `xml:"characterName,attr"`
CorporationID int64 `xml:"corporationID,attr"`
CorporationName string `xml:"corporationName,attr"`
DamageTaken int64 `xml:"damageTaken,attr"`
FactionID int64 `xml:"factionID,attr"`
FactionName string `xml:"factionName,attr"`
ShipTypeID int64 `xml:"shipTypeID,attr"`
X float64 `xml:"x,attr"`
Y float64 `xml:"y,attr"`
Z float64 `xml:"z,attr"`
} `xml:"victim"`
Rowsets []struct {
Who string `xml:"name,attr"` // Attackers or Items
Rows []struct {
// Attackers struct {
AllianceID int64 `xml:"allianceID,attr"`
AllianceName string `xml:"allianceName,attr"`
CharacterID int64 `xml:"characterID,attr"`
CharacterName string `xml:"characterName,attr"`
CorporationID int64 `xml:"corporationID,attr"`
CorporationName string `xml:"corporationName,attr"`
DamageDone int64 `xml:"damageDone,attr"`
FactionID int64 `xml:"factionID,attr"`
FactionName string `xml:"factionName,attr"`
FinalBlow bool `xml:"finalBlow,attr"`
SecurityStatus float64 `xml:"securityStatus,attr"`
ShipTypeID int64 `xml:"shipTypeID,attr"`
WeaponTypeID int64 `xml:"weaponTypeID,attr"`
// }
// Items struct {
QtyDestroyed int64 `xml:"qtyDestroyed,attr"`
QtyDropped int64 `xml:"qtyDropped,attr"`
TypeID int64 `xml:"typeID,attr"`
Flag int64 `xml:"flag,attr"`
Singleton int64 `xml:"singleton,attr"`
// }
} `xml:"row"`
} `xml:"rowset"`
} `xml:"result>rowset>row"`
}
var str = `<?xml version='1.0' encoding='UTF-8'?>
<eveapi version="2">
<currentTime>2016-07-06 05:49:28</currentTime>
<result>
<rowset name="kills" key="killID" columns="killID,solarSystemID,killTime,moonID">
<row killID="54933226" solarSystemID="31001222" killTime="2016-07-03 22:29:19" moonID="0">
<victim characterID="93811169" characterName="Madcat326" corporationID="98008818" corporationName="Haight Industries LLC" allianceID="0" allianceName="" factionID="0" factionName="" damageTaken="63039" shipTypeID="17918" x="59788513854.179" y="-13687850177.3741" z="157817245029.115" />
<rowset name="attackers" columns="characterID,characterName,corporationID,corporationName,allianceID,allianceName,factionID,factionName,securityStatus,damageDone,finalBlow,weaponTypeID,shipTypeID">
<row characterID="91316135" characterName="Celeo Servasse" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="-1.0646369409683" damageDone="7825" finalBlow="1" weaponTypeID="3520" shipTypeID="12003" />
<row characterID="95273329" characterName="Mupoc Kashuken" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="-0.2" damageDone="16656" finalBlow="0" weaponTypeID="31882" shipTypeID="12023" />
<row characterID="94389072" characterName="Johanis Cal-dahari" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="2" damageDone="11999" finalBlow="0" weaponTypeID="24486" shipTypeID="29986" />
<row characterID="92090484" characterName="Foxstar Damaskeenus" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="-0.4" damageDone="10383" finalBlow="0" weaponTypeID="22444" shipTypeID="22444" />
<row characterID="95708401" characterName="Bibet Shakure" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="-1.3" damageDone="6928" finalBlow="0" weaponTypeID="24490" shipTypeID="29986" />
<row characterID="0" characterName="" corporationID="500020" corporationName="Serpentis" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="0" damageDone="3903" finalBlow="0" weaponTypeID="0" shipTypeID="38659" />
<row characterID="96420826" characterName="D Joker" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="0" damageDone="2858" finalBlow="0" weaponTypeID="2488" shipTypeID="33470" />
<row characterID="0" characterName="" corporationID="500011" corporationName="Angel Cartel" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="0" damageDone="2487" finalBlow="0" weaponTypeID="0" shipTypeID="42127" />
<row characterID="94791823" characterName="chaosInjection" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="-1" damageDone="0" finalBlow="0" weaponTypeID="12267" shipTypeID="29986" />
<row characterID="90957994" characterName="Conner Asanari" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" securityStatus="0.5" damageDone="0" finalBlow="0" weaponTypeID="16521" shipTypeID="22452" />
</rowset>
<rowset name="items" columns="typeID,flag,qtyDropped,qtyDestroyed,singleton">
<row typeID="394" flag="20" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="24427" flag="32" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="2446" flag="87" qtyDropped="1" qtyDestroyed="1" singleton="0" />
<row typeID="28209" flag="87" qtyDropped="2" qtyDestroyed="0" singleton="0" />
<row typeID="4405" flag="15" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="33450" flag="27" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="19215" flag="23" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="2456" flag="87" qtyDropped="5" qtyDestroyed="0" singleton="0" />
<row typeID="26448" flag="93" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="33450" flag="28" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="394" flag="24" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="394" flag="21" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="19215" flag="19" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="4405" flag="14" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="1422" flag="12" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="2048" flag="16" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="26448" flag="94" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="33450" flag="29" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="33450" flag="30" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="2629" flag="5" qtyDropped="1750" qtyDestroyed="0" singleton="0" />
<row typeID="33450" flag="31" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="2281" flag="22" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="19241" flag="25" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="1422" flag="13" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="26448" flag="92" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="1422" flag="11" qtyDropped="0" qtyDestroyed="1" singleton="0" />
</rowset>
</row>
<row killID="54868503" solarSystemID="31000868" killTime="2016-06-30 03:39:22" moonID="0">
<victim characterID="91316135" characterName="Celeo Servasse" corporationID="98134538" corporationName="Wormbro" allianceID="0" allianceName="" factionID="0" factionName="" damageTaken="18472" shipTypeID="11987" x="685670430496.578" y="-376814977944.382" z="-365907110851.975" />
<rowset name="attackers" columns="characterID,characterName,corporationID,corporationName,allianceID,allianceName,factionID,factionName,securityStatus,damageDone,finalBlow,weaponTypeID,shipTypeID">
<row characterID="641035756" characterName="Lenex Raay" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="5.00297218487895" damageDone="1169" finalBlow="1" weaponTypeID="2969" shipTypeID="22444" />
<row characterID="1817541889" characterName="gr33nCO" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-0.1" damageDone="2163" finalBlow="0" weaponTypeID="2456" shipTypeID="22444" />
<row characterID="92060039" characterName="Braxus Deninard" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-0.7" damageDone="1770" finalBlow="0" weaponTypeID="2488" shipTypeID="22444" />
<row characterID="1734877398" characterName="Pantuf" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="4.9" damageDone="1681" finalBlow="0" weaponTypeID="2456" shipTypeID="22444" />
<row characterID="92941592" characterName="Foedus Latro" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-1.2" damageDone="1663" finalBlow="0" weaponTypeID="22444" shipTypeID="22444" />
<row characterID="782985098" characterName="AwingendeR" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="1.9" damageDone="1501" finalBlow="0" weaponTypeID="2488" shipTypeID="22444" />
<row characterID="93802816" characterName="Tycho Loor" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-1.9" damageDone="1405" finalBlow="0" weaponTypeID="22444" shipTypeID="22444" />
<row characterID="91004291" characterName="Broxis Khoros" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-1.8" damageDone="1228" finalBlow="0" weaponTypeID="2488" shipTypeID="22444" />
<row characterID="92007576" characterName="Dean Mintar" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="3.1" damageDone="1057" finalBlow="0" weaponTypeID="2488" shipTypeID="22444" />
<row characterID="91702100" characterName="EMU EVIL" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-1.4" damageDone="792" finalBlow="0" weaponTypeID="2488" shipTypeID="11978" />
<row characterID="95430803" characterName="Violet Dawn" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="1" damageDone="789" finalBlow="0" weaponTypeID="2488" shipTypeID="33157" />
<row characterID="647412341" characterName="Lysus" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-2" damageDone="761" finalBlow="0" weaponTypeID="22444" shipTypeID="22444" />
<row characterID="91986431" characterName="sHanQ Myteia" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-1" damageDone="497" finalBlow="0" weaponTypeID="2456" shipTypeID="11963" />
<row characterID="90571681" characterName="Pyrric Skloric" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="0.1" damageDone="356" finalBlow="0" weaponTypeID="2488" shipTypeID="22444" />
<row characterID="964223112" characterName="Tisisan" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="0.9" damageDone="313" finalBlow="0" weaponTypeID="2488" shipTypeID="22444" />
<row characterID="1039287135" characterName="J3rz11" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="0.4" damageDone="265" finalBlow="0" weaponTypeID="2488" shipTypeID="22444" />
<row characterID="91343130" characterName="Sophia Utama" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="0.6" damageDone="237" finalBlow="0" weaponTypeID="22444" shipTypeID="22444" />
<row characterID="94149890" characterName="Minnie Sodom" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="2.6" damageDone="225" finalBlow="0" weaponTypeID="2488" shipTypeID="11978" />
<row characterID="91875279" characterName="Derek Itinen" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="0.8" damageDone="210" finalBlow="0" weaponTypeID="2488" shipTypeID="11978" />
<row characterID="1556079273" characterName="Alita Hayes" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-0.1" damageDone="186" finalBlow="0" weaponTypeID="22444" shipTypeID="22444" />
<row characterID="2086742079" characterName="Turd Destroyer" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="3.3" damageDone="115" finalBlow="0" weaponTypeID="22444" shipTypeID="22444" />
<row characterID="91044028" characterName="Viktoria Bernhardt" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="2.8" damageDone="89" finalBlow="0" weaponTypeID="28215" shipTypeID="11978" />
<row characterID="941167595" characterName="Justin Cody" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="1.6" damageDone="0" finalBlow="0" weaponTypeID="15891" shipTypeID="11969" />
<row characterID="686125406" characterName="NoobMan" corporationID="98040755" corporationName="Hard Knocks Inc." allianceID="99005065" allianceName="Hard Knocks Citizens" factionID="0" factionName="" securityStatus="-0.1" damageDone="0" finalBlow="0" weaponTypeID="2873" shipTypeID="11186" />
</rowset>
<rowset name="items" columns="typeID,flag,qtyDropped,qtyDestroyed,singleton">
<row typeID="16455" flag="30" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="16455" flag="28" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="31366" flag="92" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="16487" flag="32" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="6005" flag="19" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="16487" flag="31" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="29011" flag="5" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="31366" flag="93" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="29009" flag="5" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="13970" flag="11" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="13982" flag="12" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="2048" flag="14" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="18712" flag="13" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="20353" flag="15" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="16455" flag="27" qtyDropped="1" qtyDestroyed="0" singleton="0" />
<row typeID="16455" flag="29" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="2488" flag="87" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="41155" flag="20" qtyDropped="0" qtyDestroyed="1" singleton="0" />
<row typeID="1952" flag="20" qtyDropped="1" qtyDestroyed="0" singleton="0" />
</rowset>
</row>
</rowset>
</result>
<cachedUntil>2016-07-06 06:16:28</cachedUntil>
</eveapi>`