In edge rails, serialized attributes are saved every time no matter
they are changed or not:
def update_with_dirty
if partial_updates?
# Serialized attributes should always be written in case
they've been
# changed in place.
update_without_dirty(changed | (attributes.keys &
self.class.serialized_attributes.keys))
else
update_without_dirty
end
end
In out app, User model has a serialized attribute friend_ids, which is
the id array of the user's friends (used to be a friendships table,
but when that table grew to tens of millions of records, we refactored
it to a User's attribute). The User model in our app is saved very
frenquently, and many users have more than 1 handred friends, so the
friend_ids may has 1kB long. Some of my colleages opposed to use
serialized friend_ids, and suggested to used a comma separated string
instead because saving 1kB each time would have performance issue.
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