class RuboCop::Cop::Rails::UniqueValidationWithoutIndex

def condition_part?(node, uniqueness_node)
  pairs = node.last_argument
  return false unless pairs.hash_type?
  return true if condition_hash_part?(pairs, keys: %i[if unless])
  return false unless uniqueness_node.hash_type?
  condition_hash_part?(uniqueness_node, keys: %i[if unless conditions])
end