Delete all the keys of the currently selected Redis's DB. Rake task.

flushdb.rb

namespace :redis do
  desc "Delete all the keys of the currently selected Redis's DB."
  task :flushdb => :environment do
    command = ["redis-cli", "-n", CONFIG[:redis][:db].to_s, "flushdb"]
    puts "EXECUTING: #{command.join(' ')}"
    system(*command)
  end
end