User controller The update_attribute action returns zero

I am trying to create my first custom controller actions for my final school project.

The value of the authorized_at attribute returns nil after trying to update it.

Errors are not displayed in the view; flash returns successfully. Can someone point me in the right direction please?

If I have not provided sufficient information, please let me know in the comments and I will add the necessary files.

registry_requests_controller.rb

class RegistryRequestsController < ApplicationController
  def index
    @registry_requests = RegistryRequest.all
  end

  def show
    @registry_request = RegistryRequest.find(params[:id])
  end

  def approve
    @approval = RegistryRequest.find(params[:id])

    if @approval.save
      @approval.update_attribute(:approved_at, true)

      flash[:notice] = "The vehicle was approved for the Registry."
      redirect_to request.referer
    else
      flash[:error] = "There was an error approving the vehicle. Please try again."
    end
  end

  def deny
    @registry_request.where(denied_at: true)
  end
end

rail console

irb(main):003:0> RegistryRequest.first
  RegistryRequest Load (0.2ms)  SELECT  "registry_requests".* FROM "registry_requests"  ORDER BY "registry_requests"."id" ASC LIMIT 1
=> #<RegistryRequest id: 1, approved_at: nil, denied_at: nil, notes: nil, vehicle_id: 31, created_at: "2015-07-23 14:01:26", updated_at: "2015-07-23 14:01:26">

increase parameters

Parameters:

{"_method"=>"patch",
 "authenticity_token"=>"F9RwL4WZbo8fXnjLqnQaG5gpVxW60JGSuqq5hPEeCJKGwPolJTNRIOmzyrX/HAsEmlwLQ9CXfS9PmNcK1OL9+A==",
 "id"=>"1"}

registry_requests # show

<div><%= @registry_request.vehicle.make %></div>
<div><%= @registry_request.vehicle.model %></div>
<div><%= @registry_request.vehicle.description %></div>
<%= link_to "Approve", approve_registry_request_path, method: :patch %>
<%= link_to "Deny", deny_registry_request_path(request), method: :patch %>

Transfer registry requests

class CreateRegistryRequests < ActiveRecord::Migration
  def change
    create_table :registry_requests do |t|
      t.datetime :approved_at
      t.datetime :denied_at
      t.text :notes
      t.references :vehicle, index: true, foreign_key: true

      t.timestamps null: false
    end
  end
end

What i tried

.save if @approval @appro.save update_attribute. update_attributes, : " (2 1)".

:

Started PATCH "/registry_requests/1/approve" for ::1 at 2015-07-27 10:47:15 -0400
Processing by RegistryRequestsController#approve as HTML
  Parameters: {"authenticity_token"=>"trCMgfHPT0LL5fOxVDmQyzRmpyFF4B/WeUHtzkvyHR0npAaLUWVw7T0IQc8BUYHUNhP7dy+n82uMc4NAbg7odw==", "id"=>"1"}
  RegistryRequest Load (0.1ms)  SELECT  "registry_requests".* FROM "registry_requests" WHERE "registry_requests"."id" = ? LIMIT 1  [["id", 1]]
   (0.0ms)  begin transaction
   (0.0ms)  commit transaction
Redirected to http://localhost:3000/registry_requests/1
Completed 302 Found in 2ms (ActiveRecord: 0.2ms)


Started GET "/registry_requests/1" for ::1 at 2015-07-27 10:47:15 -0400
Processing by RegistryRequestsController#show as HTML
  Parameters: {"id"=>"1"}
  RegistryRequest Load (0.1ms)  SELECT  "registry_requests".* FROM "registry_requests" WHERE "registry_requests"."id" = ? LIMIT 1  [["id", 1]]
  Vehicle Load (0.1ms)  SELECT  "vehicles".* FROM "vehicles" WHERE "vehicles"."id" = ?  ORDER BY created_at DESC LIMIT 1  [["id", 31]]
  Rendered registry_requests/show.html.erb within layouts/application (1.3ms)
  User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["id", 6]]
Completed 200 OK in 72ms (Views: 71.2ms | ActiveRecord: 0.3ms)