Video media_data: Change layout in the mongo world

Change the media_data for video from
entry.media_data["video"] to use entry.media_data directly.

Also start a bare MediaEntry.media_data_init(**kwargs)
method for setting up the media_data and possibly
initialising it with kwargs.

mediagoblin/db/mongo/migrations.py

@@ -139,3 +139,17 @@ def remove_calculated_html(database):
     drop_table_field(database, 'users', 'bio_html')
     drop_table_field(database, 'media_entries', 'description_html')
     drop_table_field(database, 'media_comments', 'content_html')
+
+@RegisterMigration(10)
+def convert_video_media_data(database):
+    """
+    Move media_data["video"] directly into media_data
+    """
+    collection = database['media_entries']
+    target = collection.find(
+        {'media_data.video': {'$exists': True}})
+
+    for document in target:
+        assert len(document['media_data']) == 1
+        document['media_data'] = document['media_data']['video']
+        collection.save(document)

mediagoblin/db/mongo/models.py

@@ -220,6 +220,9 @@ class MediaEntry(Document, MediaEntryMixin):
 
     id = MongoPK()
 
+    def media_data_init(self, **kwargs):
+        self.media_data.update(kwargs)
+
     def get_comments(self, ascending=False):
         if ascending:
             order = ASCENDING