Module: ActiveSample

Defined in:
lib/active_sample.rb,
lib/active_sample/version.rb

Defined Under Namespace

Classes: NegativeSampleError

Constant Summary collapse

VERSION = 
"1.0.1"

Instance Method Summary collapse

Instance Method Details

#sample(n = 1) ⇒ Object 



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# File 'lib/active_sample.rb', line 8

def sample(n = 1)
  if n < 0
    raise NegativeSampleError.new("negative sample number".freeze)
  end

  max_id = maximum(:id)

  return nil if max_id == nil

  if n == 1
    while !(found = find_by(id: 1 + rand(max_id))); end

    found
  elsif n == 0
    none
  else
    where(id: ids.sample(n))
  end
end