FIX: inviting a user again after the first invite expires will create a new invite

app/assets/javascripts/discourse/templates/user/invited.js.handlebars

@@ -41,6 +41,9 @@
           {{else}}
             <td>{{unbound email}}</td>
             <td colspan='6'>
+              {{#if expired}}
+                {{i18n user.invited.expired}}
+              {{/if}}
               {{#if rescinded}}
                 {{i18n user.invited.rescinded}}
               {{else}}

app/models/invite.rb

@@ -50,7 +50,15 @@ class Invite < ActiveRecord::Base
   # Return the previously existing invite if already exists. Returns nil if the invite can't be created.
   def self.invite_by_email(email, invited_by, topic=nil)
     lower_email = Email.downcase(email)
-    invite = Invite.with_deleted.where('invited_by_id = ? and email = ?', invited_by.id, lower_email).first
+    invite = Invite.with_deleted
+                   .where('invited_by_id = ? and email = ?', invited_by.id, lower_email)
+                   .order('created_at DESC')
+                   .first
+
+    if invite && invite.expired?
+      invite.destroy
+      invite = nil
+    end
 
     if invite.blank?
       invite = Invite.create(invited_by: invited_by, email: lower_email)

app/serializers/invite_serializer.rb

@@ -1,10 +1,14 @@
 class InviteSerializer < ApplicationSerializer
 
-  attributes :email, :created_at, :redeemed_at
+  attributes :email, :created_at, :redeemed_at, :expired
   has_one :user, embed: :objects, serializer: InvitedUserSerializer
 
   def include_email?
     !object.redeemed?
   end
 
+  def expired
+    object.expired?
+  end
+
 end

config/locales/client.en.yml

@@ -356,6 +356,7 @@ en:
         pending: "Pending Invites"
         topics_entered: "Topics Viewed"
         posts_read_count: "Posts Read"
+        expired: "This invite has expired."
         rescind: "Remove Invitation"
         rescinded: "Invite removed"
         time_read: "Read Time"

spec/models/invite_spec.rb

@@ -100,6 +100,15 @@ describe Invite do
           it 'matches case sensitively for the local part' do
             topic.invite_by_email(inviter, 'ICEKING@adventuretime.ooo').should_not == @invite
           end
+
+          it 'returns a new invite if the other has expired' do
+            SiteSetting.stubs(:invite_expiry_days).returns(1)
+            @invite.created_at = 2.days.ago
+            @invite.save
+            new_invite = topic.invite_by_email(inviter, 'iceking@adventuretime.ooo')
+            new_invite.should_not == @invite
+            new_invite.should_not be_expired
+          end
         end
 
         context 'when adding to another topic' do