Show total responses on admin page

back/store.go

@@ -133,17 +133,17 @@ func (s *Store) CreateEvent(ctx context.Context, cmd CreateEventCommand) (result
 	return
 }
 
-type GetEventQuery struct {
+type GetEventMetadataQuery struct {
 	AlphaID string
 }
 
-type GetEventResult struct {
+type GetEventMetadataResult struct {
 	Name                     string
 	Description              string
 	EarliestDate, LatestDate time.Time
 }
 
-func (s *Store) GetEvent(ctx context.Context, query GetEventQuery) (GetEventResult, error) {
+func (s *Store) GetEventMetadata(ctx context.Context, query GetEventMetadataQuery) (GetEventMetadataResult, error) {
 	conn := s.pool.Get(ctx)
 	defer s.pool.Put(conn)
 
@@ -151,7 +151,7 @@ func (s *Store) GetEvent(ctx context.Context, query GetEventQuery) (GetEventResu
 		SELECT name, description, earliest_date, latest_date
 		FROM event
 		WHERE alpha_id = ?;`
-	var result GetEventResult
+	var result GetEventMetadataResult
 	var found bool
 	err := sqlitex.Exec(conn, dbQuery,
 		func(stmt *sqlite.Stmt) error {
@@ -171,11 +171,38 @@ func (s *Store) GetEvent(ctx context.Context, query GetEventQuery) (GetEventResu
 			return err
 		}, query.AlphaID)
 	if err != nil {
-		return GetEventResult{}, err
+		return GetEventMetadataResult{}, err
 	}
 	if !found {
 		// TODO return a constant or a specific error type for Not Found
-		return GetEventResult{}, errors.New("not found")
+		return GetEventMetadataResult{}, errors.New("not found")
 	}
 	return result, nil
 }
+
+type GetEventResponsesQuery struct {
+	AlphaID string
+}
+
+type GetEventResponsesResult struct {
+	TotalResponses int
+}
+
+func (s *Store) GetEventResponses(ctx context.Context, query GetEventResponsesQuery) (GetEventResponsesResult, error) {
+	conn := s.pool.Get(ctx)
+	defer s.pool.Put(conn)
+
+	var result GetEventResponsesResult
+	const dbQuery = `
+		SELECT COUNT(*)
+		FROM response
+		JOIN event ON response.event_id = event.id
+		WHERE event.alpha_id = ?;`
+	err := sqlitex.Exec(conn, dbQuery,
+		func(stmt *sqlite.Stmt) error {
+			result.TotalResponses = stmt.ColumnInt(0)
+			return nil
+		}, query.AlphaID)
+	// TODO return an error if the event does not exist?
+	return result, err
+}