Hotfix the issuable counters when filtering by multiple labels

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/helpers/application_helper.rb

@@ -286,8 +286,19 @@ module ApplicationHelper
     }
 
     state_title = titles[state] || state.to_s.humanize
-    count       = records.public_send(state).size
-    html        = content_tag :span, state_title
+    records_with_state = records.public_send(state)
+
+    # When filtering by multiple labels, the result of query.count is a Hash
+    # of the form { issuable_id1 => N, issuable_id2 => N }, where N is the
+    # number of labels selected. The ugly "trick" is to load the issuables
+    # as an array and get the size of the array...
+    # We should probably try to solve this properly in the future.
+    # See https://gitlab.com/gitlab-org/gitlab-ce/issues/22414
+    label_names = Array(params.fetch(:label_name, []))
+    records_with_state = records_with_state.to_a if label_names.many?
+
+    count = records_with_state.size
+    html  = content_tag :span, state_title
 
     if count.present?
       html += " "

spec/features/issues/filter_by_labels_spec.rb

@@ -6,20 +6,19 @@ feature 'Issue filtering by Labels', feature: true do
   let(:project) { create(:project, :public) }
   let!(:user)   { create(:user)}
   let!(:label)  { create(:label, project: project) }
+  let(:bug) { create(:label, project: project, title: 'bug') }
+  let(:feature) { create(:label, project: project, title: 'feature') }
+  let(:enhancement) { create(:label, project: project, title: 'enhancement') }
+  let(:issue1) { create(:issue, title: "Bugfix1", project: project) }
+  let(:issue2) { create(:issue, title: "Bugfix2", project: project) }
+  let(:issue3) { create(:issue, title: "Feature1", project: project) }
 
   before do
-    bug = create(:label, project: project, title: 'bug')
-    feature = create(:label, project: project, title: 'feature')
-    enhancement = create(:label, project: project, title: 'enhancement')
-
-    issue1 = create(:issue, title: "Bugfix1", project: project)
     issue1.labels << bug
 
-    issue2 = create(:issue, title: "Bugfix2", project: project)
     issue2.labels << bug
     issue2.labels << enhancement
 
-    issue3 = create(:issue, title: "Feature1", project: project)
     issue3.labels << feature
 
     project.team << [user, :master]
@@ -159,6 +158,13 @@ feature 'Issue filtering by Labels', feature: true do
       wait_for_ajax
     end
 
+    it 'shows a correct "Open" counter' do
+      page.within '.issues-state-filters' do
+        expect(page).not_to have_content "{#{issue2.id} => 1}"
+        expect(page).to have_content "Open 1"
+      end
+    end
+
     it 'shows issue "Bugfix2" in issues list' do
       expect(page).to have_content "Bugfix2"
     end