checkpoint1 codeclimate errors fixed

app/controllers/user_sessions_controller.rb

@@ -34,7 +34,7 @@ def create
           redirect_to root_url, notice: "Already linked to another account!"
         end
       else
-        if @identity && @identity.user.present?
+        if @identity&.user.present?
           # The identity we found had a user associated with it so let's
           # just log them in here
           self.current_user = @identity.user

app/models/user_tag.rb

@@ -4,6 +4,7 @@ class UserTag < ActiveRecord::Base
 
   validates :value, presence: :true
   validates :value, format: { with: /\A[\w\.:-]*\z/, message: 'can only include letters, numbers, and dashes' }
+  validates_uniqueness_of :value, :scope => :uid
   before_save :preprocess
 
   def preprocess

app/views/users/edit.html.erb

@@ -5,5 +5,10 @@
   <hr />
 
   <%= render 'form' %>
+  <div class="row" style="display:flex;">
+      <div class="loginbutton" >
+        <%= link_to "Link with Google", "/auth/google_oauth2", class: "btn btn-primary" %>
+      </div>
+  </div>
 
 </div>

config/initializers/omniauth.rb

@@ -1,4 +1,4 @@
 Rails.application.config.middleware.use OmniAuth::Builder do
   provider :google_oauth2, ENV["google_app_key"],ENV["google_app_secret"] , skip_jwt: true
-  provider :facebook, ENV["APP_ID"],ENV["APP_SECRET"] , skip_jwt: true
+  provider :facebook, ENV["APP_ID"],ENV["APP_SECRET"], { scope: "email,public_profile,user_likes" }
 end