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