class RuboCop::Cop::Rails::RedundantPresenceValidationOnBelongsTo

def on_send(node)
  presence_validation?(node) do |all_keys, options, presence|
    # If presence is the only validation option and other non-validation options
    # are present, removing it will cause rails to error.
    used_option_keys = options.keys.select(&:sym_type?).map(&:value)
    remaining_validations = used_option_keys - NON_VALIDATION_OPTIONS - [:presence]
    return if remaining_validations.none? && options.keys.length > 1
    keys = non_optional_belongs_to(node.parent, all_keys)
    return if keys.none?
    add_offense_and_correct(node, all_keys, keys, options, presence)
  end
end