Make e.g. hatsune_miku_(cosplay) automatically add hatsune_miku and cosplay.
Perform autotagging after aliasing so that *_(cosplay) aliases (e.g.
hestia_(dungeon)_(cosplay) -> hestia_(danmachi)_(cosplay)) can take
effect first.
Move normalize_tags (which processes metatags) from before_save to
before_validation. This is so that it runs as early as possible, before
strip_source / parse_pixiv_ids / updater_can_change_rating, so these
callbacks can handle source/rating changes from metatags.
Fixes a couple bugs:
* Ratings locks were ignored when using rating:s metatag (regression in 0006b76)
* Pixiv ids weren't updated when using source:blah metatag.
Note: this means that `post.update_attribute(:tag_string => "art:bkub)`
is now wrong. This is because update_attribute runs callbacks but not
validations, so it doesn't process metatags from the tag string.
`update` or `update_attributes` must be used instead.
Reorder callbacks into the same order Rails runs them in:
* before_validation
* validate
* before_save
* before_create
* after_create
* after_save
* after_commit
This doesn't change the behavior of anything, it simply rearranges
callbacks so their running order is less confusing.
Currently rating locks are only obeyed when using the rating: metatag.
They aren't obeyed when:
* Changing the rating via the API.
* Changing the rating via 'Rate Safe' in the mode menu (uses the API).
* Reverting to previous versions.
Also, the current behavior is to ignore the rating: metatag if the post
is locked. This patch instead makes the update fail completely (note that
this could affect trying to mass revert posts that may be rating locked).
Note: the check for `!is_rating_locked_changed?` is so that
PUT /posts/1.json?post[rating]=s&post[is_rating_locked]=true
works (ie., locking and changing the rating at the same time is okay).
vote.destroy sets the score in the database but not on the in-memory
post. So just reload the post from the db to get the updated score,
don't duplicate the logic of setting it again.
* Make illust_id_from_url a public class method instead of a protected
instance method so that Post#parse_pixiv_id can use it.
* Also make illust_id_from_url swallow the exception that
illust_id_from_url! throws so that parse_pixiv_id can use it.
