migrate atlas series from sortedm2m

atlas/models.py

@@ -354,8 +354,8 @@ class Case(models.Model, AuthorMixin):
         help_text="If a case should be freely available to browse", default=True
     )
 
-    series = SortedManyToManyField("Series", related_name="case")
-    #series = models.ManyToManyField("Series", through="SeriesDetail", related_name="case")
+    #series = SortedManyToManyField("Series", related_name="case")
+    series = models.ManyToManyField("Series", through="SeriesDetail", related_name="case")
 
     notes = GenericRelation(QuestionNote)
 
@@ -869,14 +869,14 @@ class CaseCollection(ExamOrCollectionGenericBase):
         }
 
 
-#class SeriesDetail(models.Model):
-#    case = models.ForeignKey(Case, on_delete=models.CASCADE)
-#    series = models.ForeignKey(Series, on_delete=models.CASCADE)
-#
-#    sort_order = models.IntegerField(default=1000)
-#
-#    class Meta:
-#        ordering = ("sort_order",)
+class SeriesDetail(models.Model):
+    case = models.ForeignKey(Case, on_delete=models.CASCADE)
+    series = models.ForeignKey(Series, on_delete=models.CASCADE)
+
+    sort_order = models.IntegerField(default=1000)
+
+    class Meta:
+        ordering = ("sort_order",)
 
 class CaseDetail(models.Model):
     case = models.ForeignKey(Case, on_delete=models.CASCADE)