Convert verification_model to ForeignKey with data migration

- Convert CodeBatch.verification_model from TextField to ForeignKey(VerificationModel)
- Add ForeignKey relationship to CodeBatchResource API
- Update QrVerifyView to use verification_model.name instead of string
- Create data migration to:
  - Rename old TextField temporarily
  - Add new ForeignKey field
  - Migrate existing model names to VerificationModel entries
  - Link batches to VerificationModel records
  - Remove old TextField
- GenericManager will now show dropdown/selector UI automatically

api/products/migrations/0111_convert_verification_model_to_foreignkey.py

@@ -0,0 +1,80 @@
+# Generated by Django 4.2.23 on 2025-11-25 22:38
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+def migrate_verification_model_data(apps, schema_editor):
+    """Migrate data from TextField to ForeignKey"""
+    CodeBatch = apps.get_model('products', 'CodeBatch')
+    VerificationModel = apps.get_model('products', 'VerificationModel')
+    
+    # Query the database directly to get the old TextField values
+    from django.db import connection
+    with connection.cursor() as cursor:
+        # Query the old field (verification_model_old after rename)
+        cursor.execute("SELECT DISTINCT verification_model_old FROM products_codebatch WHERE verification_model_old IS NOT NULL AND verification_model_old != ''")
+        rows = cursor.fetchall()
+        unique_model_names = {row[0] for row in rows if row[0]}
+    
+    # Create VerificationModel entries for each unique model name
+    model_map = {}
+    for model_name in unique_model_names:
+        vm, created = VerificationModel.objects.get_or_create(name=model_name)
+        model_map[model_name] = vm
+    
+    # Update all CodeBatch records to use the ForeignKey
+    with connection.cursor() as cursor:
+        cursor.execute("SELECT id, verification_model_old FROM products_codebatch WHERE verification_model_old IS NOT NULL AND verification_model_old != ''")
+        rows = cursor.fetchall()
+        for batch_id, model_name in rows:
+            if model_name in model_map:
+                vm = model_map[model_name]
+                CodeBatch.objects.filter(pk=batch_id).update(verification_model=vm)
+
+
+def reverse_migrate_verification_model_data(apps, schema_editor):
+    """Reverse migration: convert ForeignKey back to TextField"""
+    CodeBatch = apps.get_model('products', 'CodeBatch')
+    # Extract the name from the ForeignKey and set it in the old field
+    from django.db import connection
+    with connection.cursor() as cursor:
+        cursor.execute("""
+            SELECT cb.id, vm.name 
+            FROM products_codebatch cb
+            LEFT JOIN products_verificationmodel vm ON cb.verification_model_id = vm.id
+            WHERE cb.verification_model_id IS NOT NULL
+        """)
+        rows = cursor.fetchall()
+        for batch_id, model_name in rows:
+            if model_name:
+                CodeBatch.objects.filter(pk=batch_id).update(verification_model_old=model_name)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('products', '0110_add_verification_model'),
+    ]
+
+    operations = [
+        # Step 1: Rename the old TextField to a temporary name
+        migrations.RenameField(
+            model_name='codebatch',
+            old_name='verification_model',
+            new_name='verification_model_old',
+        ),
+        # Step 2: Add the new ForeignKey field
+        migrations.AddField(
+            model_name='codebatch',
+            name='verification_model',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='batches', to='products.verificationmodel', verbose_name='验证模型（可选，留空使用默认模型）'),
+        ),
+        # Step 3: Migrate the data
+        migrations.RunPython(migrate_verification_model_data, reverse_migrate_verification_model_data),
+        # Step 4: Remove the old TextField
+        migrations.RemoveField(
+            model_name='codebatch',
+            name='verification_model_old',
+        ),
+    ]

api/products/models.py

@@ -194,8 +194,9 @@ class CodeBatch(models.Model):
                                             verbose_name="小程序入口路径（可选）")
     mini_prog_entry_env_version = models.CharField(max_length=128, null=True, blank=True, default='release',
                                                    verbose_name="小程序入口环境版本（可选）, 默认release。如为trial则进入体验版")
-    verification_model = models.TextField(null=True, blank=True,
+    verification_model = models.ForeignKey('VerificationModel', related_name='batches', null=True, blank=True,
-                                        verbose_name="验证模型名称（可选，留空使用默认模型）")
+                                          on_delete=models.SET_NULL,
+                                          verbose_name="验证模型（可选，留空使用默认模型）")
 
     def gen_code(self, n):
         a = 10 ** (self.num_digits - 1)

api/products/views.py

@@ -326,6 +326,7 @@ class ProductPropertyResource(BaseResource):
 
 class CodeBatchResource(BaseResource):
     tenant = ForeignKey(TenantResource, 'tenant', null=True, blank=True)
+    verification_model = ForeignKey(VerificationModelResource, 'verification_model', null=True, blank=True)
     class Meta:
         queryset = CodeBatch.objects.all().order_by('-pk')
         resource_name = 'code-batch'
@@ -739,7 +740,7 @@ class QrVerifyView(BaseView):
                 t = threading.Thread(target=oss_put, args=(image_name, img_data))
                 t.run()
             if sc.batch.feature_comparison_threshold > 0.01:
-                model_name = sc.batch.verification_model if sc.batch.verification_model else None
+                model_name = sc.batch.verification_model.name if sc.batch.verification_model else None
                 used_model = self.do_v5_qr_verify(imgs, messages, model_name=model_name)
                 sd.verification_model = used_model if used_model else None
             else: