I'm using Memcached with Heroku for a Rails 3.1 app. I had a bug and the wrong things are showing - the parameters were incorrect for the cache.
I had this:
<% cache("foo_header_cache_#{@user.id}") do %>
I removed the fragment caching and pushed to Heroku and the bad data went away.
And then I changed it to:
<% cache("foo_header_cache_#{@foo.id}") do %>
However, when I corrected the parameters, from @user to @foo, the old [incorrect] cached version showed again (instead of refreshing with the correct data).
How can I manually expire this, or otherwise get rid of this bad data that is showing?
I ended up manually clearing the entire cache by going into the rails console and using the command:
Rails.cache.clear