ActiveRecord::sample

sample.rb

# Example usage:
# Product.sample    => returns a Product
# Product.sample(3) => returns an array of 3 products
# Product.sample(3, true).order('title')   => allows chaining

class ActiveRecord::Base

  # Choose rows at random
  def self.sample(n = 1, keep_as_relation = false)
    rows = offset(rand(0...(count-n-1))).limit(n)
    rows = rows.first(n) unless keep_as_relation
    rows = rows.first unless keep_as_relation || n != 1
    return rows
  end

end