Sort exported labels, fix #1466

backend/api/tests/download/test_writer.py

@@ -32,6 +32,16 @@ class TestCSVWriter(unittest.TestCase):
         }
         self.assertEqual(line, expected)
 
+    def test_label_order(self):
+        writer = CsvWriter('.')
+        record1 = Record(id=0, data='', label=['labelA', 'labelB'], user='', metadata={})
+        record2 = Record(id=0, data='', label=['labelB', 'labelA'], user='', metadata={})
+        line1 = writer.create_line(record1)
+        line2 = writer.create_line(record2)
+        expected = 'labelA#labelB'
+        self.assertEqual(line1['label'], expected)
+        self.assertEqual(line2['label'], expected)
+
     @patch('os.remove')
     @patch('zipfile.ZipFile')
     @patch('csv.DictWriter.writerow')

backend/api/views/download/writer.py

@@ -84,7 +84,7 @@ class CsvWriter(BaseWriter):
         return {
             'id': record.id,
             'data': record.data,
-            'label': '#'.join(record.label),
+            'label': '#'.join(sorted(record.label)),
             **record.metadata
         }
 
@@ -144,6 +144,7 @@ class FastTextWriter(LineWriter):
 
     def create_line(self, record):
         line = [f'__label__{label}' for label in record.label]
+        line.sort()
         line.append(record.data)
         line = ' '.join(line)
         return line