Migrate and remove Referent model

stages/migrations/0017_migrate_referents.py

@@ -0,0 +1,31 @@
+from django.db import migrations
+
+
+def migrate_referents(apps, schema_editor):
+    Teacher = apps.get_model("stages", "Teacher")
+    Training = apps.get_model("stages", "Training")
+    errors = False
+    for tr in Training.objects.filter(referent_old__isnull=False):
+        if tr.referent_old.last_name == 'Liechti Held':
+            last_name = 'Liechti'
+        elif tr.referent_old.last_name == 'Haldimann Luethi':
+            last_name = 'Haldimann'
+        elif tr.referent_old.last_name == 'Kummer':
+            last_name = 'Kummer-Invernizzi'
+        else:
+            last_name = tr.referent_old.last_name
+        try:
+            tr.referent = Teacher.objects.get(first_name=tr.referent_old.first_name.strip(), last_name=last_name)
+        except Teacher.DoesNotExist:
+            print("Unable to find referent %s in teachers" % " ".join([tr.referent_old.first_name, tr.referent_old.last_name]))
+        else:
+            tr.save()
+        
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stages', '0016_referent_to_teacher'),
+    ]
+
+    operations = [migrations.RunPython(migrate_referents, migrations.RunPython.noop),]

stages/migrations/0018_removed_referent_model.py

@@ -0,0 +1,18 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stages', '0017_migrate_referents'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='training',
+            name='referent_old',
+        ),
+        migrations.DeleteModel(
+            name='Referent',
+        ),
+    ]