validates input_options based on input type

app/validators/input_options_presence_validator.rb

@@ -0,0 +1,11 @@
+class InputOptionsPresenceValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    return true unless record.input_type =~ /radio|check/i
+    return true if value.present? && value.count > 0
+
+    record.errors[attribute] << (options[:message] ||
+                                "You must provide answer options for the selected input type.")
+
+    false
+  end
+end