Set display_field for verification_model to show model name

- Add display_field='name' to verification_model field in CodeBatchResource
- RelatedFieldEditor will now display model name instead of raw JSON object

api/products/views.py

@@ -352,6 +352,8 @@ class CodeBatchResource(BaseResource):
         schema['fields']['description']['longtext'] = True
         self.annotate_field(schema, 'code__count', '序列码数量')
         self.annotate_field(schema, 'tenant__username', '租户')
+        if 'verification_model' in schema['fields']:
+            schema['fields']['verification_model']['display_field'] = 'name'
         return self.patch_product_name_schema(schema)
 
 class CodeResource(BaseResource):