.

longs/migrations/0041_long_sorted_series.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.5 on 2021-08-11 17:16
+
+from django.db import migrations
+import sortedm2m.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('longs', '0040_auto_20210801_0947'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='long',
+            name='sorted_series',
+            field=sortedm2m.fields.SortedManyToManyField(help_text=None, related_name='long_sorted', to='longs.LongSeries'),
+        ),
+    ]

longs/models.py

@@ -130,7 +130,7 @@ class Long(models.Model):
     question_json_id = models.IntegerField(default=1, help_text="Auto incrementing json creation number")
 
 
-    sorted_series = SortedManyToManyField("LongSeries")
+    sorted_series = SortedManyToManyField("LongSeries", related_name="long_sorted")
 
     #question_file = models.FileField(upload_to=question_file_directory_path, blank=True, null=True)