Moves review re-structing into separate migration

bookwyrm/migrations/0030_reviewrating.py

@@ -1,35 +1,7 @@
 # Generated by Django 3.0.7 on 2021-01-01 19:05
 
-from django.db.models.fields.reverse_related import ManyToOneRel
-from django.db.models import Q
 from django.db import migrations, models
 import django.db.models.deletion
-from bookwyrm.management.commands.deduplicate_book_data import update_related
-
-
-def convert_review_rating(app_registry, schema_editor):
-    ''' take reviews with no content and turn them into ratings '''
-    db_alias = schema_editor.connection.alias
-    reviews = app_registry.get_model('bookwyrm', 'Review')
-    review_ratings = app_registry.get_model('bookwyrm', 'ReviewRating')
-    ratings = reviews.objects.using(db_alias).filter(
-        Q(content__isnull=True) | Q(content=''))
-    # replace the old review with the rating
-    for review in ratings:
-        rating = review_ratings.objects.create(
-            user=review.user, rating=review.rating, book=review.book)
-        for field in review._meta.get_fields():
-            if isinstance(field, ManyToOneRel) or field.name == 'status_ptr':
-                continue
-            value = getattr(review, field.name)
-            print(review, rating, field.name, value)
-            try:
-                setattr(rating, field.name, value)
-            except TypeError:
-                getattr(rating, field.name).set(value.all())
-        rating.save()
-        update_related(rating, review)
-        review.delete()
 
 class Migration(migrations.Migration):
 
@@ -48,5 +20,4 @@ class Migration(migrations.Migration):
             },
             bases=('bookwyrm.review',),
         ),
-        migrations.RunPython(convert_review_rating),
     ]