fix empty export in entity-relationship-labeling

backend/data_export/pipeline/repositories.py

@@ -80,7 +80,11 @@ class TextRepository(BaseRepository):
         for doc in docs:
             label_per_user = self.label_per_user(doc)
             if self.project.collaborative_annotation:
-                label_per_user = self.reduce_user(label_per_user)
+                if getattr(self.project, "use_relation", False):
+                    value_type = "dict"
+                else:
+                    value_type = "list"
+                label_per_user = self.reduce_user(label_per_user, value_type)
             for user, label in label_per_user.items():
                 yield Record(data_id=doc.id, data=doc.text, label=label, user=user, metadata=doc.meta)
             # todo:
@@ -96,9 +100,17 @@ class TextRepository(BaseRepository):
     def label_per_user(self, doc) -> Dict:
         raise NotImplementedError()
 
-    def reduce_user(self, label_per_user: Dict[str, List]):
-        value = list(itertools.chain(*label_per_user.values()))
-        return {"all": value}
+    def reduce_user(self, label_per_user: Dict, value_type):
+        if value_type == "list":
+            value_list = list(itertools.chain(*label_per_user))
+            return {"all": value_list}
+        if value_type == "dict":
+            value_dict = dict(
+                (label_type, label_per_user[user][label_type])
+                for user in label_per_user
+                for label_type in label_per_user[user]
+            )
+            return {"all": value_dict}
 
 
 class TextClassificationRepository(TextRepository):