fix: mongodb无指定数据库时，一些自动化任务会失败

apps/assets/serializers/asset/database.py

@@ -1,3 +1,6 @@
+from rest_framework.serializers import ValidationError
+from django.utils.translation import ugettext_lazy as _
+
 from assets.models import Database
 from .common import AssetSerializer
 from ..gateway import GatewayWithAccountSecretSerializer
@@ -14,6 +17,13 @@ class DatabaseSerializer(AssetSerializer):
         ]
         fields = AssetSerializer.Meta.fields + extra_fields
 
+    def validate(self, attrs):
+        platform = attrs.get('platform')
+        if platform and getattr(platform, 'name') == 'MongoDB' \
+                and not attrs.get('db_name'):
+            raise ValidationError({'db_name': _('This field is required.')})
+        return attrs
+
 
 class DatabaseWithGatewaySerializer(DatabaseSerializer):
     gateway = GatewayWithAccountSecretSerializer()