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jfernandez/gist:722335

Created November 30, 2010 20:26
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Active users in the last 15 minutes with Redis
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gistfile1.rb
# Adds a User ID to a sorted set using the current timestamp as the score
redis = Redis.new
redis.zadd("active-users", Time.now.to_i, user.id)
# Get all User IDs with a timestamp within the timestamp range
user_ids = redis.zrangebyscore("active-users", 15.minutes.ago.to_i, Time.now.to_i)
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