From f1800007723133ffe7acd659f2945e33d9c27a8d Mon Sep 17 00:00:00 2001
From: Hugo FOYART <11079152+foyarash@users.noreply.github.com>
Date: Fri, 4 Oct 2024 10:47:12 +0200
Subject: [PATCH 1/2] fix: crash on undefined relationship length

---
 .changeset/metal-ties-help.md           | 5 +++++
 packages/next-admin/src/utils/server.ts | 4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/metal-ties-help.md

diff --git a/.changeset/metal-ties-help.md b/.changeset/metal-ties-help.md
new file mode 100644
index 00000000..4e3ba3a6
--- /dev/null
+++ b/.changeset/metal-ties-help.md
@@ -0,0 +1,5 @@
+---
+"@premieroctet/next-admin": patch
+---
+
+fix: crash on undefined relationship length (#465)
diff --git a/packages/next-admin/src/utils/server.ts b/packages/next-admin/src/utils/server.ts
index 513492a7..7acd0019 100644
--- a/packages/next-admin/src/utils/server.ts
+++ b/packages/next-admin/src/utils/server.ts
@@ -439,8 +439,8 @@ export const findRelationInData = (
        * because one side of a one-to-one relation will not have relationFromFields
        */
       if (
-        (dmmfPropertyRelationFromFields!.length > 0 &&
-          dmmfPropertyRelationToFields!.length > 0) ||
+        (dmmfPropertyRelationFromFields?.length &&
+          dmmfPropertyRelationToFields?.length) ||
         !dmmfProperty.isList
       ) {
         const idProperty = getModelIdProperty(dmmfProperty.type as ModelName);

From ba3bd3d184f3f5e888ca0106662d8152dfa7bbce Mon Sep 17 00:00:00 2001
From: Hugo FOYART <11079152+foyarash@users.noreply.github.com>
Date: Fri, 4 Oct 2024 10:58:46 +0200
Subject: [PATCH 2/2] add optional operator in fillRelationInSchema

---
 packages/next-admin/src/utils/server.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/next-admin/src/utils/server.ts b/packages/next-admin/src/utils/server.ts
index 7acd0019..a8e3299a 100644
--- a/packages/next-admin/src/utils/server.ts
+++ b/packages/next-admin/src/utils/server.ts
@@ -252,7 +252,7 @@ export const fillRelationInSchema =
         if (fieldKind === "object") {
           const modelNameRelation = fieldType as ModelName;
 
-          if (relationToFields!.length > 0) {
+          if (relationToFields?.length) {
             //Relation One-to-Many, Many side
             const enumeration: Enumeration[] = [];
             schema.definitions[modelName].properties[fieldName] = {