Merge branch 'issues-show-performance' into 'master'

Improve performance of viewing individual issues

This MR does two things:

1. `Issue#related_branches` no longer performs Git operations that aren't needed
2. The output of `Repository#exists?` is now cached and flushed properly

Combined these two changes should further cut down the amount of Git operations performed when viewing individual issues (and possibly other pages).

See merge request !3296

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/models/issue_spec.rb b/spec/models/issue_spec.rb
index 05e4233243d..8334545b759 100644
--- a/spec/models/issue_spec.rb
+++ b/spec/models/issue_spec.rb
@@ -183,9 +183,9 @@ describe Issue, models: true do
   describe '#related_branches' do
     it "selects the right branches" do
       allow(subject.project.repository).to receive(:branch_names).
-                                    and_return(["mpempe", "#{subject.iid}mepmep", subject.to_branch_name])
+        and_return(["mpempe", "#{subject.iid}mepmep", subject.to_branch_name])
 
-      expect(subject.related_branches).to eq [subject.to_branch_name]
+      expect(subject.related_branches).to eq([subject.to_branch_name])
     end
   end