Fix broken file browsing with relative submodule in personal projects

Closes https://github.com/gitlabhq/gitlabhq/issues/7554

CHANGELOG

@@ -4,7 +4,7 @@ v 7.11.0 (unreleased)
   - Fix clone URL field and X11 Primary selection (Dmitry Medvinsky)
   - Ignore invalid lines in .gitmodules
   - Fix "Cannot move project" error message from popping up after a successful transfer (Stan Hu)
-  -
+  - Fix broken file browsing with relative submodule in personal projects (Stan Hu)
   - Add "Reply quoting selected text" shortcut key (`r`)
   -
   -

app/helpers/submodule_helper.rb

@@ -63,7 +63,7 @@ module SubmoduleHelper
     namespace = components.pop.gsub(/^\.\.$/, '')
 
     if namespace.empty?
-      namespace = @project.group.path
+      namespace = @project.namespace.name
     end
 
     [

spec/helpers/submodule_helper_spec.rb

@@ -117,34 +117,41 @@ describe SubmoduleHelper do
     context 'submodules with relative links' do
       let(:group) { create(:group) }
       let(:project) { create(:project, group: group) }
+      let(:commit_id) { sample_commit[:id] }
 
       before do
         self.instance_variable_set(:@project, project)
       end
 
       it 'one level down' do
-        commit_id = sample_commit[:id]
         result = relative_self_links('../test.git', commit_id)
         expect(result).to eq(["/#{group.path}/test", "/#{group.path}/test/tree/#{commit_id}"])
       end
 
       it 'two levels down' do
-        commit_id = sample_commit[:id]
         result = relative_self_links('../../test.git', commit_id)
         expect(result).to eq(["/#{group.path}/test", "/#{group.path}/test/tree/#{commit_id}"])
       end
 
       it 'one level down with namespace and repo' do
-        commit_id = sample_commit[:id]
         result = relative_self_links('../foobar/test.git', commit_id)
         expect(result).to eq(["/foobar/test", "/foobar/test/tree/#{commit_id}"])
       end
 
       it 'two levels down with namespace and repo' do
-        commit_id = sample_commit[:id]
         result = relative_self_links('../foobar/baz/test.git', commit_id)
         expect(result).to eq(["/baz/test", "/baz/test/tree/#{commit_id}"])
       end
+
+      context 'personal project' do
+        let(:user) { create(:user) }
+        let(:project) { create(:project, namespace: user.namespace) }
+
+        it 'one level down with personal project' do
+          result = relative_self_links('../test.git', commit_id)
+          expect(result).to eq(["/#{user.username}/test", "/#{user.username}/test/tree/#{commit_id}"])
+        end
+      end
     end
   end