Add subscriber status counts to the lists UI.

- Change `query-lists` query to aggregate the subscriber count by
  status (confirmed, unsubscribed etc.) and expose them under a new
  `subscriber_statuses: {}` field in the `GET /lists` API.
- Display the statuses and counts in the lists table on the UI.

Closes #616

cmd/lists.go

@@ -93,6 +93,11 @@ func handleGetLists(c echo.Context) error {
 		if v.Tags == nil {
 			out.Results[i].Tags = make(pq.StringArray, 0)
 		}
+
+		// Total counts.
+		for _, c := range v.SubscriberCounts {
+			out.Results[i].SubscriberCount += c
+		}
 	}
 
 	if single {

frontend/src/views/Lists.vue

@@ -61,7 +61,7 @@
       </b-table-column>
 
       <b-table-column v-slot="props" field="type" :label="$t('globals.fields.type')"
-        header-class="cy-type" sortable>
+        header-class="cy-type" sortable width="15%">
         <div class="tags">
           <b-tag :class="props.row.type" :data-cy="`type-${props.row.type}`">
             {{ $t(`lists.types.${props.row.type}`) }}
@@ -94,6 +94,16 @@
         </router-link>
       </b-table-column>
 
+      <b-table-column v-slot="props" field="subscriber_counts"
+        header-class="cy-subscribers" width="10%">
+        <div class="fields stats">
+          <p v-for="(count, status) in props.row.subscriberStatuses" :key="status">
+            <label>{{ $t(`subscribers.status.${status}`) }}</label>
+            <span :class="status">{{ $utils.formatNumber(count) }}</span>
+          </p>
+        </div>
+      </b-table-column>
+
       <b-table-column v-slot="props" field="created_at" :label="$t('globals.fields.createdAt')"
         header-class="cy-created_at" sortable>
           {{ $utils.niceDate(props.row.createdAt) }}

models/models.go

@@ -149,6 +149,9 @@ type subLists struct {
 // SubscriberAttribs is the map of key:value attributes of a subscriber.
 type SubscriberAttribs map[string]interface{}
 
+// StringIntMap is used to define DB Scan()s.
+type StringIntMap map[string]int
+
 // Subscribers represents a slice of Subscriber.
 type Subscribers []Subscriber
 
@@ -167,13 +170,14 @@ type SubscriberExport struct {
 type List struct {
 	Base
 
-	UUID            string         `db:"uuid" json:"uuid"`
-	Name            string         `db:"name" json:"name"`
-	Type            string         `db:"type" json:"type"`
-	Optin           string         `db:"optin" json:"optin"`
-	Tags            pq.StringArray `db:"tags" json:"tags"`
-	SubscriberCount int            `db:"subscriber_count" json:"subscriber_count"`
-	SubscriberID    int            `db:"subscriber_id" json:"-"`
+	UUID             string         `db:"uuid" json:"uuid"`
+	Name             string         `db:"name" json:"name"`
+	Type             string         `db:"type" json:"type"`
+	Optin            string         `db:"optin" json:"optin"`
+	Tags             pq.StringArray `db:"tags" json:"tags"`
+	SubscriberCount  int            `db:"-" json:"subscriber_count"`
+	SubscriberCounts StringIntMap   `db:"subscriber_statuses" json:"subscriber_statuses"`
+	SubscriberID     int            `db:"subscriber_id" json:"-"`
 
 	// This is only relevant when querying the lists of a subscriber.
 	SubscriptionStatus string `db:"subscription_status" json:"subscription_status,omitempty"`
@@ -319,12 +323,20 @@ func (s SubscriberAttribs) Value() (driver.Value, error) {
 	return json.Marshal(s)
 }
 
-// Scan unmarshals JSON into SubscriberAttribs.
+// Scan unmarshals JSONB from the DB.
 func (s SubscriberAttribs) Scan(src interface{}) error {
 	if data, ok := src.([]byte); ok {
 		return json.Unmarshal(data, &s)
 	}
-	return fmt.Errorf("Could not not decode type %T -> %T", src, s)
+	return fmt.Errorf("could not not decode type %T -> %T", src, s)
+}
+
+// Scan unmarshals JSONB from the DB.
+func (s StringIntMap) Scan(src interface{}) error {
+	if data, ok := src.([]byte); ok {
+		return json.Unmarshal(data, &s)
+	}
+	return fmt.Errorf("could not not decode type %T -> %T", src, s)
 }
 
 // GetIDs returns the list of campaign IDs.

queries.sql

@@ -351,12 +351,13 @@ WITH ls AS (
     OFFSET $3 LIMIT (CASE WHEN $4 = 0 THEN NULL ELSE $4 END)
 ),
 counts AS (
-	SELECT COUNT(*) as subscriber_count, list_id FROM subscriber_lists
-    WHERE status != 'unsubscribed'
-    AND ($1 = 0 OR list_id = $1)
-    GROUP BY list_id
+    SELECT list_id, JSON_OBJECT_AGG(status, subscriber_count) AS subscriber_statuses FROM (
+        SELECT COUNT(*) as subscriber_count, list_id, status FROM subscriber_lists
+        WHERE ($1 = 0 OR list_id = $1)
+        GROUP BY list_id, status
+    ) row GROUP BY list_id
 )
-SELECT ls.*, COALESCE(subscriber_count, 0) AS subscriber_count FROM ls
+SELECT ls.*, subscriber_statuses FROM ls
     LEFT JOIN counts ON (counts.list_id = ls.id) ORDER BY %s %s;