Merge branch 'fix/ca-no-date' into 'master'

fix for builds with no start date throwing an error in cycle analytics events

Instead of the error, we should inform that there is no start date

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/24925

See merge request !7738

app/assets/javascripts/cycle_analytics/components/total_time_component.js.es6

@@ -10,10 +10,15 @@
     },
     template: `
       <span class="total-time">
+        <template v-if="Object.keys(time).length">
           <template v-if="time.days">{{ time.days }} <span>{{ time.days === 1 ? 'day' : 'days' }}</span></template>
           <template v-if="time.hours">{{ time.hours }} <span>hr</span></template>
           <template v-if="time.mins && !time.days">{{ time.mins }} <span>mins</span></template>
           <template v-if="time.seconds && Object.keys(time).length === 1 || time.seconds === 0">{{ time.seconds }} <span>s</span></template>
+        </template>
+        <template v-else>
+          --
+        </template>
       </span>
     `,
   });

app/serializers/analytics_build_entity.rb

@@ -13,7 +13,7 @@ class AnalyticsBuildEntity < Grape::Entity
   end
   expose :duration, as: :total_time do |build|
-    distance_of_time_as_hash(build.duration.to_f)
+    build.duration ? distance_of_time_as_hash(build.duration.to_f) : {}
   end
   expose :branch do

app/serializers/entity_date_helper.rb

@@ -2,6 +2,8 @@ module EntityDateHelper
   include ActionView::Helpers::DateHelper
   def interval_in_words(diff)
+    return 'Not started' unless diff
+
     "#{distance_of_time_in_words(Time.now, diff)} ago"
   end

changelogs/unreleased/fix-ca-no-date.yml

+---
+title: Fix for error thrown in cycle analytics events if build has not started
+merge_request: 
+author: 

spec/serializers/analytics_build_entity_spec.rb

@@ -7,7 +7,9 @@ describe AnalyticsBuildEntity do
   context 'build with an author' do
     let(:user) { create(:user) }
-    let(:build) { create(:ci_build, author: user, started_at: 2.hours.ago, finished_at: 1.hour.ago) }
+    let(:started_at) { 2.hours.ago }
+    let(:finished_at) { 1.hour.ago }
+    let(:build) { create(:ci_build, author: user, started_at: started_at, finished_at: finished_at) }
     subject { entity.as_json }
@@ -31,5 +33,54 @@ describe AnalyticsBuildEntity do
     it 'contains the duration' do
       expect(subject[:total_time]).to eq(hours: 1 )
     end
+
+    context 'no started at or finished at date' do
+      let(:started_at) { nil }
+      let(:finished_at) { nil }
+
+      it 'does not blow up' do
+        expect{ subject[:date] }.not_to raise_error
+      end
+
+      it 'shows the right message' do
+        expect(subject[:date]).to eq('Not started')
+      end
+
+      it 'shows the right total time' do
+        expect(subject[:total_time]).to eq({})
+      end
+    end
+
+    context 'no started at date' do
+      let(:started_at) { nil }
+
+      it 'does not blow up' do
+        expect{ subject[:date] }.not_to raise_error
+      end
+
+      it 'shows the right message' do
+        expect(subject[:date]).to eq('Not started')
+      end
+
+      it 'shows the right total time' do
+        expect(subject[:total_time]).to eq({})
+      end
+    end
+
+    context 'no finished at date' do
+      let(:finished_at) { nil }
+
+      it 'does not blow up' do
+        expect{ subject[:date] }.not_to raise_error
+      end
+
+      it 'shows the right message' do
+        expect(subject[:date]).to eq('about 2 hours ago')
+      end
+
+      it 'shows the right total time' do
+        expect(subject[:total_time]).to eq({ hours: 2 })
+      end
+    end
   end
 end