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# ColorValidator
#
# Custom validator for web color codes. It requires the leading hash symbol and
# will accept RGB triplet or hexadecimal formats.
#
# Example:
#
# class User < ActiveRecord::Base
# validates :background_color, allow_blank: true, color: true
# end
#
class ColorValidator < ActiveModel::EachValidator
PATTERN = /\A\#[0-9A-Fa-f]{3}{1,2}+\Z/.freeze
def validate_each(record, attribute, value)
unless value =~ PATTERN
record.errors.add(attribute, "must be a valid color code")
end
end
end
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