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]: