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Ruby on Rails custom validator to validate HEX color format

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                  class HexColorValidator < ActiveModel::EachValidator
  HEX_COLOR_REGEX = /\A#(?:[0-9a-fA-F]{3}){1,2}\z/

  def validate_each(record, attribute, value)
    unless value.match?(HEX_COLOR_REGEX)
      record.errors.add(attribute, "must be a valid hex color code")
    end
  end
end

                  class Theme < ApplicationRecord
  validates :primary_color, hex_color: true
end

This snippet defines a custom validator for hex color codes, ensuring that values follow the correct #RGB or #RRGGBB format. By using ActiveModel::EachValidator, the validation logic remains reusable across multiple models. This approach keeps models clean while providing a centralized way to enforce formatting rules, making it easier to maintain consistent validation logic across the application.

Martin Sojka

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Ruby on Rails custom validator to validate HEX color format

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