修复bug

DAPlatform/dao/Relation.py

@@ -32,14 +32,13 @@ class Relation(Model):
 def create_relation(slice_id, user_id, data_id):
     try:
         r = Relation.get(slice_id=slice_id, user_id=user_id, data_id=data_id)
-        if not r:
-            Slice.add_annotation(slice_id)
-            relation = Relation(slice_id=slice_id, user_id=user_id, data_id=data_id)
-            relation.save()
     except:
-        return Result(0, "create failed", {})
-    else:
+        Slice.add_annotation(slice_id)
+        relation = Relation(slice_id=slice_id, user_id=user_id, data_id=data_id)
+        relation.save()
         return Result(1, "create success", {})
+    else:
+        return Result(0, "create failed", {})
 
 
 # 设置标注关系的打分数值