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Custom Validator for “At Least One of” Fields

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                  class AtLeastOneValidator < ActiveModel::Validator
  def initialize(options)
    super
    @fields = Array(options.fetch(:fields))
  end

  def validate(record)
    return if @fields.any? { |f| record.public_send(f).present? }
    record.errors.add(:base, "Provide at least one of: #{@fields.join(', ')}")
  end
end

                  class SupportRequest < ApplicationRecord
  has_one_attached :screenshot
  validates_with AtLeastOneValidator, fields: %i[message screenshot]
end

A tiny custom validator keeps complex presence rules out of controllers. This example enforces that at least one of two fields is present (e.g., text content or an attachment).

Sarah Chen

More from Sarah Chen

Custom Validator for “At Least One of” Fields

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More from Sarah Chen