From 064c55b711670de36e099bdb796910345856ab0e Mon Sep 17 00:00:00 2001
From: Sebastian Serth <Sebastian.Serth@hpi.de>
Date: Sun, 17 Oct 2021 18:54:44 +0200
Subject: [PATCH] Add new validator for all elements of an array

---
 app/validators/array_validator.rb | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 app/validators/array_validator.rb

diff --git a/app/validators/array_validator.rb b/app/validators/array_validator.rb
new file mode 100644
index 00000000..f8e88414
--- /dev/null
+++ b/app/validators/array_validator.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class ArrayValidator < ActiveModel::EachValidator
+  # Taken from https://gist.github.com/justalever/73a1b36df8468ec101f54381996fb9d1
+
+  def validate_each(record, attribute, values)
+    Array(values).each do |value|
+      options.each do |key, args|
+        validator_options = {attributes: attribute}
+        validator_options.merge!(args) if args.is_a?(Hash)
+
+        next if value.nil? && validator_options[:allow_nil]
+        next if value.blank? && validator_options[:allow_blank]
+
+        validator_class_name = "#{key.to_s.camelize}Validator"
+        validator_class = begin
+          validator_class_name.constantize
+        rescue NameError
+          "ActiveModel::Validations::#{validator_class_name}".constantize
+        end
+
+        validator = validator_class.new(validator_options)
+        validator.validate_each(record, attribute, value)
+      end
+    end
+  end
+end