Dynamically passing question to validator

app/controllers/case_logs_controller.rb

@@ -26,6 +26,7 @@ class CaseLogsController < ApplicationController
     previous_page = params[:case_log][:previous_page]
     questions_for_page = form.questions_for_page(previous_page).keys
     answers_for_page = page_params(questions_for_page).select { |k, _v| questions_for_page.include?(k) }
+    @case_log.custom_validator_options = { previous_page: previous_page }
     if @case_log.update(answers_for_page)
       redirect_path = form.next_page_redirect_path(previous_page)
       redirect_to(send(redirect_path, @case_log))

app/models/case_log.rb

@@ -1,6 +1,9 @@
 class CaseLogValidator < ActiveModel::Validator
+
   def validate_tenant_age(record)
-    if record.tenant_age < 0
+    if !record.tenant_age?
+      record.errors.add :base, "Tenant age can't be blank"
+    elsif record.tenant_age < 0
       record.errors.add :base, "Age needs to be above 0"
     elsif record.tenant_age > 120
       record.errors.add :base, "Age needs to be below 120"
@@ -8,13 +11,23 @@ class CaseLogValidator < ActiveModel::Validator
   end
 
   def validate(record)
-    if record.tenant_age?
+    question_to_validate = options[:previous_page]
+
+    if question_to_validate == "tenant_code"
+      if !record.tenant_code?
+        record.errors.add :base, "Tenant code can't be blank"
+      end
+    elsif question_to_validate == "tenant_age"
         validate_tenant_age(record)
     end
   end
 end
 
 class CaseLog < ApplicationRecord 
+  validate :instance_validations
+  attr_accessor :custom_validator_options
   enum status: { "in progress" => 0, "submitted" => 1 }
-  validates_with CaseLogValidator
+  def instance_validations
+    validates_with CaseLogValidator, (custom_validator_options || {})
+  end
 end