From c4cd3734b32dfb87c9b994c1d7fc04f90174a640 Mon Sep 17 00:00:00 2001
From: Daniel <845765@qq.com>
Date: Mon, 27 May 2024 20:38:05 +0800
Subject: [PATCH] :art: Improve database relation field filtering
 https://github.com/siyuan-note/siyuan/issues/11547

---
 kernel/av/filter.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/kernel/av/filter.go b/kernel/av/filter.go
index 9157d968a..ab3a1aa5a 100644
--- a/kernel/av/filter.go
+++ b/kernel/av/filter.go
@@ -165,10 +165,18 @@ func (value *Value) Filter(filter *ViewFilter, attrView *AttributeView, rowID st
 		}
 	}
 
-	if nil != value.Relation && KeyTypeRelation == value.Type && 0 < len(value.Relation.Contents) && nil != filter.Value && KeyTypeRelation == filter.Value.Type &&
+	if nil != value.Relation && KeyTypeRelation == value.Type && nil != filter.Value && KeyTypeRelation == filter.Value.Type &&
 		nil != filter.Value.Relation && 0 < len(filter.Value.Relation.BlockIDs) {
 		// 单独处理关联类型的比较
 
+		// 处理为空和不为空
+		switch filter.Operator {
+		case FilterOperatorIsEmpty:
+			return 0 == len(value.Relation.Contents)
+		case FilterOperatorIsNotEmpty:
+			return 0 != len(value.Relation.Contents)
+		}
+
 		for _, relationValue := range value.Relation.Contents {
 			filterValue := &Value{Type: KeyTypeBlock, Block: &ValueBlock{Content: filter.Value.Relation.BlockIDs[0]}}