mongo-ruby-driver/docs/examples/capped.rb

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$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
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require 'mongo'
include Mongo
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host = ENV['MONGO_RUBY_DRIVER_HOST'] || 'localhost'
port = ENV['MONGO_RUBY_DRIVER_PORT'] || Connection::DEFAULT_PORT
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puts "Connecting to #{host}:#{port}"
db = Connection.new(host, port).db('ruby-mongo-examples')
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db.drop_collection('test')
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# A capped collection has a max size and, optionally, a max number of records.
# Old records get pushed out by new ones once the size or max num records is reached.
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coll = db.create_collection('test', :capped => true, :size => 1024, :max => 12)
100.times { |i| coll.insert('a' => i+1) }
# We will only see the last 12 records
coll.find().each { |row| p row }
coll.drop