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Diffstat (limited to 'app/validators/color_validator.rb')
| -rw-r--r-- | app/validators/color_validator.rb | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/app/validators/color_validator.rb b/app/validators/color_validator.rb new file mode 100644 index 00000000000..571d0007aa2 --- /dev/null +++ b/app/validators/color_validator.rb @@ -0,0 +1,20 @@ +# 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 |