module AWS::DynamoDB::Expectations

def expect_conditions(options)
  expected = {}
  options[:if].each do |name, value|
    context = "expected value for attribute #{name}"
    expected[name.to_s] = {
      :value => format_attribute_value(value, context)
    }
  end if options[:if]
  [options[:unless_exists]].flatten.each do |name|
    expected[name.to_s] = { :exists => false }
  end if options[:unless_exists]
  expected
end