Rails after_save send mail with updated columns - ruby-on-rails

Question

I am stuck in an issue, wherein I would like to send mail after the after_save callback in rails.
Below is my code snippet:
class Response < ActiveRecord::Base
after_create :pending_with
protected
def pending_with
self.approver = self.mapping.user
end
end
class ResponsesController < ApplicationController
def create
#response = current_user.responses.new(response_params)
respond_to do |format|
if #response.save
flash[:notice] = "Response has been saved successfully."
Notification.confirm_approver(#response).deliver
format.html { redirect_to dashboard_home_url }
else
flash[:error] = "There is some problem while saving the responses. Please try again."
format.html { render action: 'new' }
end
end
end
end
class Notification < ApplicationMailer
def confirm_approver(response)
#response = response
p "============"
p #response.approver.email.inspect
end
end
My issue is that, I am not getting approver. Getting error:
undefined method `approver' for nil:NilClass
When I checked the record in the database, apporver ('id') is successfully saved. Am I missing anything here?
BACKTRACE:
app/mailers/notification.rb:11:in `confirm_approver'
vendor/gems/ruby/1.9.1actionpack (4.1.8) lib/abstract_controller/base.rb:189:in `process_action'
vendor/gems/ruby/1.9.1actionpack (4.1.8) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
vendor/gems/ruby/1.9.1activesupport (4.1.8) lib/active_support/callbacks.rb:82:in `run_callbacks'
vendor/gems/ruby/1.9.1actionpack (4.1.8) lib/abstract_controller/callbacks.rb:19:in `process_action'
vendor/gems/ruby/1.9.1actionpack (4.1.8) lib/abstract_controller/base.rb:136:in `process'
vendor/gems/ruby/1.9.1actionview (4.1.8) lib/action_view/rendering.rb:30:in `process'
vendor/gems/ruby/1.9.1actionmailer (4.1.8) lib/action_mailer/base.rb:580:in `block in process'
vendor/gems/ruby/1.9.1activesupport (4.1.8) lib/active_support/notifications.rb:159:in `block in instrument'
vendor/gems/ruby/1.9.1activesupport (4.1.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
vendor/gems/ruby/1.9.1activesupport (4.1.8) lib/active_support/notifications.rb:159:in `instrument'
vendor/gems/ruby/1.9.1actionmailer (4.1.8) lib/action_mailer/base.rb:577:in `process'
vendor/gems/ruby/1.9.1actionmailer (4.1.8) lib/action_mailer/base.rb:568:in `initialize'
vendor/gems/ruby/1.9.1actionmailer (4.1.8) lib/action_mailer/base.rb:551:in `new'
vendor/gems/ruby/1.9.1actionmailer (4.1.8) lib/action_mailer/base.rb:551:in `method_missing'
app/controllers/responses_controller.rb:23:in `block in create'
vendor/gems/ruby/1.9.1actionpack (4.1.8) lib/action_controller/metal/mime_responds.rb:433:in `call'
vendor/gems/ruby/1.9.1actionpack (4.1.8) lib/action_controller/metal/mime_responds.rb:433:in `retrieve_collector_from_mimes'
vendor/gems/ruby/1.9.1actionpack (4.1.8) lib/action_controller/metal/mime_responds.rb:256:in `respond_to'
app/controllers/responses_controller.rb:19:in `create'

Answer 1

Hi Based on #zwippie inputs, it worked. Just made little modification to it.
def create
#response = current_user.responses.new(response_params)
respond_to do |format|
if #response.save && #response.reload
Notification.confirm_approver(#response).deliver
flash[:notice] = "Response has been created successfully."
else
format.html { render action: 'new' }
end
end
end