Moving belongs_to object to different association

I have two AR models in a one-to-many relationship.

class Feed < ActiveRecord::Base
  belongs_to :channel, :counter_cache => true
end

class Channel
  has_many :feeds
end

I need to move a feed to a different channel. This works, except the
feeds_counter cache is not changed for the 'to' channel. What do I need to do
differently?

old_channel = ...
new_channel = ...

f = old_channel.feeds[0]
old_channel.feeds.delete(f)
new_channel.feeds << f

Initially, there is one feed in each channel. old_channel.feeds_count is zero
(Yeah!), but new_channel.feeds_count is still one (Boo!).

What to do differently?

TIA,
  Jeffrey

does

feed.channel = new_channel

work better ?

Fred

Quoting Frederick Cheung <frederick.cheung@gmail.com>:

>
> Initially, there is one feed in each channel. old_channel.feeds_count is zero
> (Yeah!), but new_channel.feeds_count is still one (Boo!).
>

does

feed.channel = new_channel

work better ?

Fred

Fred,
  Duh, smacks forehead. It is certainly simpler.

Yes it does work. Thank you very much. Too much seeing the single tree
blocking my path and missing the paved road right next to it.

Thank you,
  Jeffrey