Migrate default edition field to work model

Fixes #281

bookwyrm/connectors/abstract_connector.py

@@ -128,9 +128,10 @@ class AbstractConnector(ABC):
             if not edition:
                 ed_key = self.get_remote_id_from_data(edition_data)
                 edition = self.create_book(ed_key, edition_data, models.Edition)
-                edition.default = True
                 edition.parent_work = work
                 edition.save()
+            work.default_edition = edition
+            work.save()
 
         # now's our change to fill in author gaps
         if not edition.authors and work.authors:

bookwyrm/connectors/openlibrary.py

@@ -72,7 +72,6 @@ class Connector(AbstractConnector):
         ]
 
 
-
     def get_remote_id_from_data(self, data):
         try:
             key = data['key']

bookwyrm/connectors/self_connector.py

@@ -1,5 +1,6 @@
 ''' using a bookwyrm instance as a source of book data '''
 from django.contrib.postgres.search import SearchRank, SearchVector
+from django.db.models import F
 
 from bookwyrm import models
 from .abstract_connector import AbstractConnector, SearchResult
@@ -30,7 +31,10 @@ class Connector(AbstractConnector):
         ).filter(
             rank__gt=min_confidence
         ).order_by('-rank')
-        results = results.filter(default=True) or results
+
+        # remove non-default editions, if possible
+        results = results.filter(parent_work__default_edition__id=F('id')) \
+                    or results
 
         search_results = []
         for book in results[:10]:

bookwyrm/migrations/0008_work_default_edition.py

@@ -0,0 +1,35 @@
+# Generated by Django 3.0.7 on 2020-11-04 18:15
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+def set_default_edition(app_registry, schema_editor):
+    db_alias = schema_editor.connection.alias
+    works = app_registry.get_model('bookwyrm', 'Work').objects.using(db_alias)
+    editions = app_registry.get_model('bookwyrm', 'Edition').objects.using(db_alias)
+    for work in works:
+        ed = editions.filter(parent_work=work, default=True).first()
+        if not ed:
+            ed = editions.filter(parent_work=work).first()
+        work.default_edition = ed
+        work.save()
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookwyrm', '0007_auto_20201103_0014'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='work',
+            name='default_edition',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='bookwyrm.Edition'),
+        ),
+        migrations.RunPython(set_default_edition),
+        migrations.RemoveField(
+            model_name='edition',
+            name='default',
+        ),
+    ]

bookwyrm/models/book.py

@@ -139,29 +139,18 @@ class Work(Book):
     ''' a work (an abstract concept of a book that manifests in an edition) '''
     # library of congress catalog control number
     lccn = models.CharField(max_length=255, blank=True, null=True)
+    default_edition = models.ForeignKey('Edition', on_delete=models.PROTECT, null=True)
 
     @property
     def editions_path(self):
         ''' it'd be nice to serialize the edition instead but, recursion '''
         return [e.remote_id for e in self.edition_set.all()]
 
-
-    @property
-    def default_edition(self):
-        ''' best-guess attempt at picking the default edition for this work '''
-        ed = Edition.objects.filter(parent_work=self, default=True).first()
-        if not ed:
-            ed = Edition.objects.filter(parent_work=self).first()
-        return ed
-
     activity_serializer = activitypub.Work
 
 
 class Edition(Book):
     ''' an edition of a book '''
-    # default -> this is what gets displayed for a work
-    default = models.BooleanField(default=False)
-
     # these identifiers only apply to editions, not works
     isbn_10 = models.CharField(max_length=255, blank=True, null=True)
     isbn_13 = models.CharField(max_length=255, blank=True, null=True)