Improved email open rate chart in dashboard 5.0

refs https://github.com/TryGhost/Team/issues/1443

- Now fetches email models instead of posts
- Fetches up to 8 emails
- Autofills missing emails, so we always have 8 emails
- Changed data structure of emailOpenRateStats variable in dashboard stats service

app/components/dashboard/v5/chart-email.js

@@ -40,8 +40,8 @@ export default class ChartEmailOpenRate extends Component {
 
     get chartData() {
         const stats = this.dashboardStats.emailOpenRateStats;
-        const labels = stats.map(stat => stat.title);
-        const data = stats.map(stat => stat.email.openRate);
+        const labels = stats.map(stat => stat.subject);
+        const data = stats.map(stat => stat.openRate);
 
         return {
             labels,

app/services/dashboard-mocks.js

@@ -215,29 +215,20 @@ export default class DashboardMocksService extends Service {
 
         this.emailOpenRateStats = [
             {
-                id: '23424',
-                title: '💸 The best way to get paid to create',
-                email: {
-                    openedCount: 518,
-                    deliveredCount: 1234
-                }
+                subject: '💸 The best way to get paid to create',
+                openRate: 58,
+                submittedAt: new Date()
             },
             {
-                id: '23425',
-                title: '🎒How to start a blog and make money',
-                email: {
-                    openedCount: 100,
-                    deliveredCount: 900
-                }
+                subject: '🎒How to start a blog and make money',
+                openRate: 42,
+                submittedAt: new Date()
             }
             ,
             {
-                id: '23426',
-                title: 'How to turn your amateur blogging into a real business',
-                email: {
-                    openedCount: 500,
-                    deliveredCount: 1600
-                }
+                subject: 'How to turn your amateur blogging into a real business',
+                openRate: 89,
+                submittedAt: new Date()
             }
         ];
 

app/services/dashboard-stats.js

@@ -30,12 +30,11 @@ import {tracked} from '@glimmer/tracking';
  */
 
 /**
- * @todo: THIS ONE IS TEMPORARY
- * @typedef EmailOpenRateStat (Will be the same as post model probably)
+ * @typedef EmailOpenRateStat
  * @type {Object}
- * @property {string} id Post id
- * @property {string} title Post title
- * @property {?Object} Email model
+ * @property {string} subject Email title
+ * @property {number} openRate Email openRate
+ * @property {Date} submittedAt Date
  */
 
 /**
@@ -400,8 +399,37 @@ export default class DashboardStatsService extends Service {
             return;
         }
 
-        const posts = yield this.store.query('post', {limit: 5, filter: 'status:published', order: 'published_at desc'});
-        this.emailOpenRateStats = posts;
+        const limit = 8;
+        let query = {
+            filter: 'email_count:-0',
+            order: 'submitted_at desc',
+            limit: limit
+        };
+        const results = yield this.store.query('email', query);
+        const data = results.toArray();
+        let stats = data.map((d) => {
+            return {
+                subject: d.subject,
+                submittedAt: moment(d.submittedAtUTC).format('YYYY-MM-DD'),
+                openRate: d.openRate
+            };
+        });
+
+        const paddedResults = [];
+        if (data.length < limit) {
+            const pad = limit - data.length;
+            const lastSubmittedAt = data.length > 0 ? data[results.length - 1].submittedAtUTC : moment();
+            for (let i = 0; i < pad; i++) {
+                paddedResults.push({
+                    subject: '',
+                    submittedAt: moment(lastSubmittedAt).subtract(i + 1, 'days').format('YYYY-MM-DD'),
+                    openRate: 0
+                });
+            }
+        }
+        stats = stats.concat(paddedResults);
+        stats.reverse();
+        this.emailOpenRateStats = stats;
     }
 
     /**