From e48391b813d3e5079238aa3f0662e7a46e1b4a54 Mon Sep 17 00:00:00 2001
From: Robert Speicher <rspeicher@gmail.com>
Date: Tue, 1 Dec 2015 18:53:44 -0500
Subject: Add custom ColorValidator

---
 app/validators/color_validator.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 app/validators/color_validator.rb

(limited to 'app/validators')

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
-- 
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