Rename changed_issue_email to reassigned_issue_email & make resque friendly

#changed_issue_email was really sending emails about issue reassignments.
Updated method name to reflect that.

Update method to take ids and then perform #finds itself during mailer
queue worker kick-off.

app/mailers/notify.rb

@@ -67,11 +67,10 @@ class Notify < ActionMailer::Base
     mail(:to => @user['email'], :subject => "gitlab | merge request changed | #{@merge_request.title} ")
   end
 
-  def changed_issue_email(user, issue)
-    @issue = Issue.find(issue['id'])
-    @user = user
-    @assignee_was ||= User.find(@issue.assignee_id_was)
-    @project = @issue.project
-    mail(:to => @user['email'], :subject => "gitlab | changed issue | #{@issue.title} ")
+  def reassigned_issue_email(recipient_id, issue_id, previous_assignee_id)
+    recipient = User.find(recipient_id)
+    @issue = Issue.find(issue_id)
+    @previous_assignee ||= User.find(previous_assignee_id)
+    mail(:to => recipient.email, :subject => "gitlab | changed issue | #{@issue.title} ")
   end
 end

app/models/mailer_observer.rb

@@ -78,8 +78,8 @@ class MailerObserver < ActiveRecord::Observer
       recipients_ids = issue.assignee_id_was, issue.assignee_id
       recipients_ids.delete current_user.id
 
-      User.find(recipients_ids).each do |user|
-        Notify.changed_issue_email(user, issue).deliver
+      recipients_ids.each do |recipient_id|
+        Notify.reassigned_issue_email(recipient_id, issue.id, issue.assignee_id_was).deliver
       end
     end
 

app/views/notify/reassigned_issue_email.html.haml

@@ -5,12 +5,12 @@
       %td{:align => "left", :style => "padding: 20px 0 0;"}
         %h2{:style => "color:#646464; font-weight: bold; margin: 0; padding: 0; line-height: 26px; font-size: 18px; font-family: Helvetica, Arial, sans-serif; "}
           Reassigned Issue
-          = link_to truncate(@issue.title, :length => 16), project_issue_url(@project, @issue)
+          = link_to truncate(@issue.title, :length => 16), project_issue_url(@issue.project, @issue)
       %td{:style => "font-size: 1px; line-height: 1px;", :width => "21"}
     %tr
       %td{:style => "font-size: 1px; line-height: 1px;", :width => "21"}
       %td{:style => "padding: 15px 0 15px;", :valign => "top"}
         %p{:style => "color:#767676; font-weight: normal; margin: 0; padding: 0; line-height: 20px; font-size: 12px;font-family: Helvetica, Arial, sans-serif; "}
-          Assignee changed from #{@assignee_was.name} to #{@issue.assignee.name}
+          Assignee changed from #{@previous_assignee.name} to #{@issue.assignee_name}
       %td
 

spec/mailers/notify_spec.rb

@@ -47,7 +47,7 @@ describe Notify do
   context 'for a project' do
     describe 'items that are assignable, the email' do
       let(:assignee) { Factory.create(:user, :email => 'assignee@example.com') }
-      let(:old_assignee) { Factory.create(:user, :name => 'Old Assignee Guy') }
+      let(:previous_assignee) { Factory.create(:user, :name => 'Previous Assignee') }
 
       shared_examples 'an assignee email' do
         it 'is sent to the assignee' do
@@ -73,9 +73,9 @@ describe Notify do
         end
 
         describe 'that have been reassigned' do
-          before(:each) { issue.stub(:assignee_id_was).and_return(old_assignee.id) }
+          before(:each) { issue.stub(:assignee_id_was).and_return(previous_assignee.id) }
 
-          subject { Notify.changed_issue_email(recipient, issue) }
+          subject { Notify.reassigned_issue_email(recipient.id, issue.id, previous_assignee.id) }
 
           it_behaves_like 'a multiple recipients email'
 
@@ -84,7 +84,7 @@ describe Notify do
           end
 
           it 'contains the name of the previous assignee' do
-            should have_body_text /#{old_assignee.name}/
+            should have_body_text /#{previous_assignee.name}/
           end
 
           it 'contains the name of the new assignee' do