Generate author_text field dynamically

bookwyrm/models/book.py

@@ -51,7 +51,6 @@ class Book(ActivitypubMixin, BookWyrmModel):
     # TODO: include an annotation about the type of authorship (ie, translator)
     authors = fields.ManyToManyField('Author')
     # preformatted authorship string for search and easier display
-    author_text = models.CharField(max_length=255, blank=True, null=True)
     cover = fields.ImageField(
         upload_to='covers/', blank=True, null=True, alt_field='alt_text')
     first_published_date = fields.DateTimeField(blank=True, null=True)
@@ -59,6 +58,11 @@ class Book(ActivitypubMixin, BookWyrmModel):
 
     objects = InheritanceManager()
 
+    @property
+    def author_text(self):
+        ''' format a list of authors '''
+        return ', '.join(a.name for a in self.authors.all())
+
     @property
     def edition_info(self):
         ''' properties of this edition, as a string '''