fix: Application user delete policy (#3375)

Author: shaohuzhang1

apps/application/migrations/0002_alter_application_user_alter_chat_id.py

@@ -0,0 +1,26 @@
+# Generated by Django 5.2.1 on 2025-06-24 09:53
+
+import django.db.models.deletion
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('application', '0001_initial'),
+        ('users', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='application',
+            name='user',
+            field=models.ForeignKey(blank=True, db_constraint=False, null=True, on_delete=django.db.models.deletion.SET_NULL, to='users.user'),
+        ),
+        migrations.AlterField(
+            model_name='chat',
+            name='id',
+            field=models.UUIDField(default=uuid.UUID('0197a15b-1024-7930-b06c-75dfaf6cba43'), editable=False, primary_key=True, serialize=False, verbose_name='主键id'),
+        ),
+    ]

apps/application/models/application.py

@@ -59,13 +59,14 @@ def get_model_setting_dict():
 class Application(AppModelMixin):
     id = models.UUIDField(primary_key=True, max_length=128, default=uuid.uuid7, editable=False, verbose_name="主键id")
     workspace_id = models.CharField(max_length=64, verbose_name="工作空间id", default="default", db_index=True)
-    folder = models.ForeignKey(ApplicationFolder, on_delete=models.DO_NOTHING, verbose_name="文件夹id", default='default')
+    folder = models.ForeignKey(ApplicationFolder, on_delete=models.DO_NOTHING, verbose_name="文件夹id",
+                               default='default')
     is_publish = models.BooleanField(verbose_name="是否发布", default=False)
     name = models.CharField(max_length=128, verbose_name="应用名称")
     desc = models.CharField(max_length=512, verbose_name="引用描述", default="")
     prologue = models.CharField(max_length=40960, verbose_name="开场白", default="")
     dialogue_number = models.IntegerField(default=0, verbose_name="会话数量")
-    user = models.ForeignKey(User, on_delete=models.DO_NOTHING)
+    user = models.ForeignKey(User, on_delete=models.SET_NULL, db_constraint=False, blank=True, null=True)
     model = models.ForeignKey(Model, on_delete=models.SET_NULL, db_constraint=False, blank=True, null=True)
     knowledge_setting = models.JSONField(verbose_name="数据集参数设置", default=get_dataset_setting_dict)
     model_setting = models.JSONField(verbose_name="模型参数相关设置", default=get_model_setting_dict)