custom error validations

app/validators/answer_format_validator.rb

@@ -0,0 +1,38 @@
+class AnswerFormatValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    send(record.question.input_type, record, attribute, value)
+  end
+
+  private
+
+    def text record, attribute, value
+      return unless value.length.between? 1, 1000
+
+      if value.blank?
+        record.errors[attribute] << (options[:message] || "Please enter an answer.")
+      end
+
+      if value.length > 1000
+        record.errors[attribute] << (options[:message] || "The character limit for a textarea answer is 1000")
+      end
+    end
+
+    def radio record, attribute, value
+      return unless value.nil?
+
+      record.errors[attribute] << (options[:message] || "Please select an answer.")
+    end
+
+    def checkbox record, attribute, value
+      return unless value.nil? || value.join.blank?
+
+      record.errors[attribute] << (options[:message] || "Please select an answer.")
+    end
+
+    def live_code record, attribute, value
+      return unless value.nil?
+
+      msg = "You must write code in one of the above textareas to progress."
+      record.errors[attribute] << (options[:message] || msg)
+    end
+end