\#to_branch_name now uses the iid as postfixissue-branch-iid-postfix

Given the branch name 'mep-mep' with an iid being 1,
the current way, master's way, would yield a branch name of
1-mep-mep. The problem for larger projects however would be that
a developer might forget what iid the issue was.

When this developer would try to tab complete it would:
- Or result in 20+ branches possibly
- Or start with the wrong digit, try again with digit++
  - Would see 20 branches, repeat

Thus the obvious way of solving this is letting the dev tab complete
on the issue title, which is easier to remember.

3 files changed, 5 insertions, 6 deletions

diff --git a/app/models/issue.rb b/app/models/issue.rb
index 053387cffd7..5347d4fa1be 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -106,9 +106,8 @@ class Issue < ActiveRecord::Base
 
   def related_branches
     return [] if self.project.empty_repo?
-    self.project.repository.branch_names.select do |branch|
-      branch =~ /\A#{iid}-(?!\d+-stable)/i
-    end
+    
+    self.project.repository.branch_names.select { |branch| branch.end_with?("-#{iid}") }
   end
 
   # Reset issue events cache
@@ -139,7 +138,7 @@ class Issue < ActiveRecord::Base
   end
 
   def to_branch_name
-    "#{iid}-#{title.parameterize}"
+    "#{title.parameterize}-#{iid}"
   end
 
   def can_be_worked_on?(current_user)
diff --git a/app/services/merge_requests/build_service.rb b/app/services/merge_requests/build_service.rb
index fa34753c4fd..6e9152e444e 100644
--- a/app/services/merge_requests/build_service.rb
+++ b/app/services/merge_requests/build_service.rb
@@ -51,7 +51,7 @@ module MergeRequests
       # be interpreted as the use wants to close that issue on this project
       # Pattern example: 112-fix-mep-mep
       # Will lead to appending `Closes #112` to the description
-      if match = merge_request.source_branch.match(/\A(\d+)-/)
+      if match = merge_request.source_branch.match(/-(\d+)\z/)
         iid = match[1]
         closes_issue = "Closes ##{iid}"
 
diff --git a/app/services/system_note_service.rb b/app/services/system_note_service.rb
index f09b77c4a57..2afcaad4646 100644
--- a/app/services/system_note_service.rb
+++ b/app/services/system_note_service.rb
@@ -210,7 +210,7 @@ class SystemNoteService
   # Called when a branch is created from the 'new branch' button on a issue
   # Example note text:
   #
-  #   "Started branch `201-issue-branch-button`"
+  #   "Started branch `issue-branch-button-201`"
   def self.new_issue_branch(issue, project, author, branch)
     h = Gitlab::Application.routes.url_helpers
     link = h.namespace_project_compare_url(project.namespace, project, from: project.default_branch, to: branch)