added validator for email address to only permit Andelans

app/models/concerns/andela_validator.rb

@@ -1,9 +1,9 @@
 module AndelaValidator
   extend ActiveSupport::Concern
 
-  ANDELA_EMAIL_REGEX = /@andela.co[m]?\z/
+  ANDELA_EMAIL_REGEX = /[\w.]+@andela.co[m]?\z/
   included do
-    validates :email, presence: true, format: {with: ANDELA_EMAIL_REGEX}
+    validates :email, presence: true, format: {with: ANDELA_EMAIL_REGEX, message: "Sign in with an Andela email address"}
   end
 
 end

app/models/social_provider.rb

@@ -1,4 +1,5 @@
 class SocialProvider < ActiveRecord::Base
+  include AndelaValidator
   belongs_to :user
   validates :uuid, presence: true
   validates :provider, presence: true

app/models/user.rb

@@ -1,4 +1,5 @@
 class User < ActiveRecord::Base
+  include AndelaValidator
   has_many :comments, as: :comment_on
   has_many :tags, as: :subscriber
   has_many :questions
@@ -9,9 +10,9 @@ class User < ActiveRecord::Base
 
   def self.from_omniauth(auth, user=nil)
     email_address = auth.info.email
-    grabbed = EMAIL_FORMAT.match(email_address).try(:[], :email) || email_address
-    to_check = "#{grabbed}%"
-    user = where(email: to_check).first_or_create do |u|
+    grabbed = EMAIL_FORMAT.match(email_address).try(:[], :email)
+    grabbed = grabbed ? "#{grabbed}%" : email_address
+    user = where("email LIKE :email", email: grabbed).first_or_create do |u|
       u.name= auth.info.name
       u.email= auth.info.email
     end