From 2cfd534bc9d3d4873e52ba4d6c777b331a91ca80 Mon Sep 17 00:00:00 2001
From: Liang Ding <d@b3log.org>
Date: Sun, 31 Jul 2022 22:33:50 +0800
Subject: [PATCH] =?UTF-8?q?:art:=20=E5=90=8C=E4=B8=80=E4=B8=AA=E5=9D=97?=
 =?UTF-8?q?=E4=B8=AD=E5=BC=95=E7=94=A8=E5=A4=9A=E4=B8=AA=E7=9B=B8=E5=90=8C?=
 =?UTF-8?q?=E5=9D=97=E6=97=B6=E5=8F=8D=E9=93=BE=E5=8E=BB=E9=87=8D=20Fix=20?=
 =?UTF-8?q?https://github.com/siyuan-note/siyuan/issues/3317?=
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---
 kernel/model/backlink.go | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/kernel/model/backlink.go b/kernel/model/backlink.go
index fc51d17a0..564c056bd 100644
--- a/kernel/model/backlink.go
+++ b/kernel/model/backlink.go
@@ -170,6 +170,7 @@ func BuildTreeBacklink(id, keyword, mentionKeyword string, beforeLen int) (boxID
 
 	var links []*Block
 	refs := sql.QueryRefsByDefID(id, true)
+	refs = removeDuplicatedRefs(refs) // 同一个块中引用多个相同块时反链去重 https://github.com/siyuan-note/siyuan/issues/3317
 
 	// 为了减少查询，组装好 IDs 后一次查出
 	defSQLBlockIDs, refSQLBlockIDs := map[string]bool{}, map[string]bool{}
@@ -269,6 +270,22 @@ func BuildTreeBacklink(id, keyword, mentionKeyword string, beforeLen int) (boxID
 	return
 }
 
+func removeDuplicatedRefs(refs []*sql.Ref) (ret []*sql.Ref) {
+	for _, ref := range refs {
+		contain := false
+		for _, r := range ret {
+			if ref.DefBlockID == r.DefBlockID && ref.BlockID == r.BlockID {
+				contain = true
+				break
+			}
+		}
+		if !contain {
+			ret = append(ret, ref)
+		}
+	}
+	return
+}
+
 func buildTreeBackmention(defSQLBlock *sql.Block, refBlocks []*Block, keyword string, excludeBacklinkIDs *hashset.Set, beforeLen int) (ret []*Block) {
 	ret = []*Block{}