From 4e4a5b9b3e052d1694442515492792fb1aa74c5a Mon Sep 17 00:00:00 2001
From: xuri <xuri.me@gmail.com>
Date: Mon, 23 Dec 2019 00:07:40 +0800
Subject: Improve compatibility, fix workbook's rels ID calc error

---
 excelize.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'excelize.go')

diff --git a/excelize.go b/excelize.go
index a2e20ff..135028c 100644
--- a/excelize.go
+++ b/excelize.go
@@ -203,11 +203,17 @@ func checkSheet(xlsx *xlsxWorksheet) {
 // relationship type, target and target mode.
 func (f *File) addRels(relPath, relType, target, targetMode string) int {
 	rels := f.relsReader(relPath)
-	rID := 0
 	if rels == nil {
 		rels = &xlsxRelationships{}
 	}
-	rID = len(rels.Relationships) + 1
+	var rID int
+	for _, rel := range rels.Relationships {
+		ID, _ := strconv.Atoi(strings.TrimPrefix(rel.ID, "rId"))
+		if ID > rID {
+			rID = ID
+		}
+	}
+	rID++
 	var ID bytes.Buffer
 	ID.WriteString("rId")
 	ID.WriteString(strconv.Itoa(rID))
-- 
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