step 這樣用

http://www.ruby-doc.org/core/classes/Range.html#M000708

<br />limit = 100<br />count = User.count<br />(1..count).step(limit) do |offset|<br /> User.all(:offset => offset, :limit => limit).each do |user|<br /> CACHE.delete("user_reply_list_#{user.id}")<br /> end<br />end<br />