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Returning a sample set from a Mongoid collection.
module Mongoid
class Criteria
def sample(n = 1)
indexes = (0..self.count-1).sort_by{ rand }.slice(0,n).collect!
if n == 1
return self.skip(indexes.first).first
else
return indexes.map{ |index| self.skip(index).first }
end
end
end
end
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