refactor: migrate to question sets for person qs

This means we're starting to use the same system for person questions
as for relationship questions

people/migrations/0023_remove_person_role.py

@@ -0,0 +1,65 @@
+# Generated by Django 2.2.10 on 2020-11-25 15:50
+
+from django.core.exceptions import ObjectDoesNotExist
+from django.db import migrations
+from django.utils import timezone
+
+from .utils.question_sets import port_question
+
+
+def migrate_forward(apps, schema_editor):
+    Person = apps.get_model('people', 'Person')
+    Role = apps.get_model('people', 'Role')
+
+    role_question = port_question(apps, 'Role',
+                                  Role.objects.values_list('name', flat=True))
+
+    for person in Person.objects.all():
+        try:
+            prev_set = person.answer_sets.latest('timestamp')
+
+        except ObjectDoesNotExist:
+            prev_set = None
+
+        try:
+
+            answer_set = person.answer_sets.create()
+            answer_set.question_answers.add(
+                role_question.answers.get(text=person.role.name))
+
+            prev_set.replaced_timestamp = timezone.datetime.now()
+
+        except AttributeError:
+            pass
+
+
+def migrate_backward(apps, schema_editor):
+    Person = apps.get_model('people', 'Person')
+    Role = apps.get_model('people', 'Role')
+
+    for person in Person.objects.all():
+        try:
+            current_answers = person.answer_sets.latest('timestamp')
+            role_answer = current_answers.question_answers.get(
+                question__text='Role')
+            person.role, _ = Role.objects.get_or_create(name=role_answer.text)
+            person.save()
+
+        except ObjectDoesNotExist:
+            pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('people', '0022_refactor_person_questions'),
+    ]
+
+    operations = [
+        migrations.RunPython(migrate_forward, migrate_backward),
+        migrations.RemoveField(
+            model_name='person',
+            name='role',
+        ),
+        migrations.DeleteModel('Role'),
+    ]