diff --git a/models/node.go b/models/node.go
index 00946e0..2bb2631 100644
--- a/models/node.go
+++ b/models/node.go
@@ -1,6 +1,7 @@
 package models
 
 import (
+	"slices"
 	"strings"
 )
 
@@ -23,15 +24,6 @@ func NewNode() *Node {
 	}
 }
 
-func (n *Node) HasTag(tag string) bool {
-	for _, t := range n.Tags {
-		if t == tag {
-			return true
-		}
-	}
-	return false
-}
-
 func (n *Node) AddTag(tag string) {
 	if tag == "" {
 		return
@@ -48,7 +40,7 @@ func (n *Node) AddTag(tag string) {
 			break
 		}
 	}
-	if !n.HasTag(tag) {
+	if !slices.Contains(n.Tags, tag) {
 		n.Tags = append(n.Tags, tag)
 	}
 }
@@ -63,15 +55,6 @@ func (n *Node) RemoveTag(tag string) {
 	n.Tags = newTags
 }
 
-func (n *Node) HasRelation(relType RelType, target string) bool {
-	for _, tgt := range n.Relations[string(relType)] {
-		if tgt == target {
-			return true
-		}
-	}
-	return false
-}
-
 func (n *Node) AddRelation(relType RelType, target string) {
 	if n.Relations == nil {
 		n.Relations = make(map[string][]string)
@@ -80,7 +63,7 @@ func (n *Node) AddRelation(relType RelType, target string) {
 		n.Relations[string(relType)] = []string{target}
 		return
 	}
-	if !n.HasRelation(relType, target) {
+	if !slices.Contains(n.Relations[string(relType)], target) {
 		n.Relations[string(relType)] = append(n.Relations[string(relType)], target)
 	}
 }