fix topic spec

db/schema.rb

@@ -84,8 +84,8 @@ ActiveRecord::Schema.define(version: 20170209215911) do
     t.integer  "user_id"
     t.string   "followed_type"
     t.integer  "followed_id"
-    t.datetime "created_at",                   null: false
-    t.datetime "updated_at",                   null: false
+    t.datetime "created_at",    null: false
+    t.datetime "updated_at",    null: false
     t.index ["followed_type", "followed_id"], name: "index_follows_on_followed_type_and_followed_id", using: :btree
     t.index ["user_id"], name: "index_follows_on_user_id", using: :btree
   end

spec/controllers/topics_controller_spec.rb

@@ -3,12 +3,11 @@ require 'rails_helper'
 
 RSpec.describe TopicsController, type: :controller do
   let(:user) { create(:user) }
-  let(:topic) { create(:topic, user: user) }
+  let(:topic) { create(:topic, user: user, updated_by: user) }
   let(:valid_attributes) { topic.attributes.except('id') }
   let(:invalid_attributes) { { permission: :invalid_lol } }
   before :each do
-    sign_in :user
-    
+    sign_in(user)
   end
 
   describe 'POST #create' do