Add custom validator and fix .html_safe with rescue

config/initializers/custom_validators.rb

@@ -0,0 +1,7 @@
+class AtLeastOneValidator < ActiveModel::EachValidator
+
+  def validate_each(record, attribute, value)
+    record.errors[attribute] << (options[:message] || I18n.t("errors.at_least_one")) if (value.blank? || value.values.join.eql?(''))
+  end
+
+end