refactor: update user field in application and knowledge models to allow null values and set null on delete

apps/application/migrations/0006_alter_applicationfolder_user.py

@@ -0,0 +1,20 @@
+# Generated by Django 5.2.4 on 2025-07-10 06:48
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('application', '0005_chat_chat_record_count_chat_mark_sum_chat_star_num_and_more'),
+        ('users', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='applicationfolder',
+            name='user',
+            field=models.ForeignKey(blank=True, db_constraint=False, null=True, on_delete=django.db.models.deletion.SET_NULL, to='users.user'),
+        ),
+    ]

apps/application/models/application.py

@@ -21,7 +21,7 @@ class ApplicationFolder(MPTTModel, AppModelMixin):
     id = models.CharField(primary_key=True, max_length=64, editable=False, verbose_name="主键id")
     name = models.CharField(max_length=64, verbose_name="文件夹名称")
     desc = models.CharField(max_length=200, null=True, blank=True, verbose_name="描述")
-    user = models.ForeignKey(User, on_delete=models.DO_NOTHING, verbose_name="用户id")
+    user = models.ForeignKey(User, on_delete=models.SET_NULL, db_constraint=False, blank=True, null=True)
     workspace_id = models.CharField(max_length=64, verbose_name="工作空间id", default="default", db_index=True)
     parent = TreeForeignKey('self', on_delete=models.DO_NOTHING, null=True, blank=True, related_name='children')
 

apps/knowledge/migrations/0004_alter_knowledgefolder_user.py

@@ -0,0 +1,20 @@
+# Generated by Django 5.2.4 on 2025-07-10 06:48
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('knowledge', '0003_alter_file_source_id_alter_file_source_type'),
+        ('users', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='knowledgefolder',
+            name='user',
+            field=models.ForeignKey(blank=True, db_constraint=False, null=True, on_delete=django.db.models.deletion.SET_NULL, to='users.user'),
+        ),
+    ]

apps/knowledge/models/knowledge.py

@@ -99,7 +99,7 @@ class KnowledgeFolder(MPTTModel, AppModelMixin):
     id = models.CharField(primary_key=True, max_length=64, editable=False, verbose_name="主键id")
     name = models.CharField(max_length=64, verbose_name="文件夹名称")
     desc = models.CharField(max_length=200, null=True, blank=True, verbose_name="描述")
-    user = models.ForeignKey(User, on_delete=models.DO_NOTHING, verbose_name="用户id")
+    user = models.ForeignKey(User, on_delete=models.SET_NULL, db_constraint=False, blank=True, null=True)
     workspace_id = models.CharField(max_length=64, verbose_name="工作空间id", default="default", db_index=True)
     parent = TreeForeignKey('self', on_delete=models.DO_NOTHING, null=True, blank=True, related_name='children')