Updates status model and serializer

bookwyrm/models/attachment.py

@@ -3,30 +3,27 @@ from django.db import models
 
 from bookwyrm import activitypub
 from .base_model import ActivitypubMixin
-from .base_model import ActivityMapping, BookWyrmModel
+from .base_model import BookWyrmModel
+from . import fields
 
 
 class Attachment(ActivitypubMixin, BookWyrmModel):
     ''' an image (or, in the future, video etc) associated with a status '''
-    status = models.ForeignKey(
+    status = fields.ForeignKey(
         'Status',
         on_delete=models.CASCADE,
         related_name='attachments',
         null=True
     )
+    reverse_unfurl = True
     class Meta:
         ''' one day we'll have other types of attachments besides images '''
         abstract = True
 
-    activity_mappings = [
-        ActivityMapping('id', 'remote_id'),
-        ActivityMapping('url', 'image'),
-        ActivityMapping('name', 'caption'),
-    ]
 
 class Image(Attachment):
     ''' an image attachment '''
-    image = models.ImageField(upload_to='status/', null=True, blank=True)
-    caption = models.TextField(null=True, blank=True)
+    image = fields.ImageField(upload_to='status/', null=True, blank=True)
+    caption = fields.TextField(null=True, blank=True)
 
     activity_serializer = activitypub.Image