优化model

backend/ai/migrations/0004_alter_chatconversation_model_id_and_more.py

@@ -0,0 +1,40 @@
+# Generated by Django 5.2.1 on 2025-07-17 07:07
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("ai", "0003_aimodel_model_type"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="chatconversation",
+            name="model_id",
+            field=models.ForeignKey(
+                blank=True,
+                db_column="model_id",
+                db_comment="向量模型编号",
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                to="ai.aimodel",
+                verbose_name="向量模型编号",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="chatmessage",
+            name="model_id",
+            field=models.ForeignKey(
+                blank=True,
+                db_column="model_id",
+                db_comment="向量模型编号",
+                null=True,
+                on_delete=django.db.models.deletion.CASCADE,
+                to="ai.aimodel",
+                verbose_name="向量模型编号",
+            ),
+        ),
+    ]

backend/ai/models.py

@@ -258,6 +258,7 @@ class ChatConversation(CoreModel):
     model_id = models.ForeignKey(
         'AIModel',
         on_delete=models.CASCADE,
+        null=True, blank=True,
         db_column='model_id',
         verbose_name="向量模型编号",
         db_comment='向量模型编号'
@@ -302,6 +303,7 @@ class ChatMessage(CoreModel):
     model_id = models.ForeignKey(
         'AIModel',
         on_delete=models.CASCADE,
+        null=True, blank=True,
         db_column='model_id',
         verbose_name="向量模型编号",
         db_comment='向量模型编号'