def _validate_enable_feed(self, key, on):
"""Ensure that modifications to the enable_feed prop won't break things.
You cannot disable the last feed-enable file of a podcast episode.
"""
if (not on and self.media and self.media.podcast_id
and len([f for f in self.media.files if f.enable_feed]) == 1):
raise MediaException, ('Published podcast media requires '
'at least one file be feed-enabled.')
return on
mapper(MediaFile, media_files)
_media_mapper = mapper(Media, media, properties={
'status': status_column_property(media.c.status),
'author': composite(Author, media.c.author_name, media.c.author_email),
'rating': composite(Rating, media.c.rating_sum, media.c.rating_votes),
'files': relation(MediaFile, backref='media', order_by=media_files.c.position.asc(), passive_deletes=True),
'tags': relation(Tag, secondary=media_tags, backref='media', collection_class=TagList),
'topics': relation(Topic, secondary=media_topics, backref='media', collection_class=TopicList),
'comments': relation(Comment, secondary=media_comments, backref=backref('media', uselist=False),
extension=CommentTypeExtension('media'), single_parent=True, passive_deletes=True),
})
# Add comment_count, comment_count_published, ... column properties to Media
_media_mapper.add_properties(_properties_dict_from_labels(
comment_count_property('comment_count', media_comments),
comment_count_property('comment_count_published', media_comments, status_where(
comments.c.status, include='publish', exclude='trash'
)),
.. warning::
The type given here and the name of the backref passed to
:func:`sqlalchemy.orm.relation` must match for the reverse-lookup
to work.
"""
def __init__(self, type):
self.type = type
def append(self, state, value, initiator):
value.type = self.type
return value
def set(self, value, oldvalue, initiator):
# Pretty certain this should never be called on a relation property.
raise NotImplemented
comment_count_property = _mtm_count_property
mapper(Comment, comments, properties={
'status': status_column_property(comments.c.status),
'author': composite(AuthorWithIP,
comments.c.author_name,
comments.c.author_email,
comments.c.author_ip),
})
