Adjust message sorting when doing after/before & from/to filtering

cortezaproject/corteza-webapp-messaging#35

messaging/internal/repository/message.go

@@ -208,7 +208,14 @@ func (r *message) Find(filter *types.MessageFilter) (types.MessageSet, error) {
 	sql += " AND rel_channel IN " + sqlChannelAccess
 	params = append(params, filter.CurrentUserID, types.ChannelTypePublic)
 
-	sql += " ORDER BY id DESC"
+	if filter.AfterID > 0 || filter.FromID > 0 || filter.BeforeID > 0 || filter.ToID > 0 {
+		// When filtering by after/before & from/to we're relying order of messages
+		// so let's make sure that they are sorted properly
+		sql += " ORDER BY id ASC"
+	} else {
+		// By default, we just take last N messages.
+		sql += " ORDER BY id DESC"
+	}
 
 	sql += " LIMIT ? "
 	params = append(params, filter.Limit)