add "statify__skip_aggregation" hook to disable aggregation

If Statify is extended by custom columns the aggregation routine will
fail. To support such scenarios, we introduce a boolean hook, so the
previous behavior can be preserved without breaking compatibility.

inc/class-statify-cron.php

@@ -23,13 +23,12 @@ class Statify_Cron extends Statify {
 	 *
 	 * @since    0.3.0
 	 * @version  1.4.0
+	 * @wp-hook boolean  statify__skip_aggregation
 	 */
 	public static function cleanup_data() {
-
-		// Global.
 		global $wpdb;
 
-		// Remove items.
+		// Remove old items.
 		$wpdb->query(
 			$wpdb->prepare(
 				"DELETE FROM `$wpdb->statify` WHERE created <= SUBDATE(%s, %d)",
@@ -38,13 +37,13 @@ public static function cleanup_data() {
 			)
 		);
 
-		// Aggregate.
-		self::aggregate_data();
+		// Aggregate data.
+		if ( ! apply_filters( 'statify__skip_aggregation', false ) ) {
+			self::aggregate_data();
+		}
 
 		// Optimize DB.
-		$wpdb->query(
-			"OPTIMIZE TABLE `$wpdb->statify`"
-		);
+		$wpdb->query( "OPTIMIZE TABLE `$wpdb->statify`" );
 	}
 
 	/**

tests/test-cron.php

@@ -29,6 +29,8 @@ public function set_up() {
 	 * @preserveGlobalState disabled
 	 */
 	public function test_cronjob() {
+		global $wpdb;
+
 		// Initialize normal cycle, configure storage period of 3 days.
 		$this->init_statify_widget( 3 );
 		$this->assertNotFalse(
@@ -61,7 +63,8 @@ public function test_cronjob() {
 			$this->assertEquals( 2, $v['count'], 'Unexpected visit count' );
 		}
 
-		// Run the cron job.
+		// Run the cron job without aggregation.
+		add_filter( 'statify__skip_aggregation', '__return_true' );
 		Statify_Cron::cleanup_data();
 
 		// Verify that 2 days have been deleted.
@@ -72,6 +75,20 @@ public function test_cronjob() {
 			$this->assertContains( $v['date'], $remaining_dates, 'Unexpected remaining date in stats' );
 			$this->assertEquals( 2, $v['count'], 'Unexpected visit count' );
 		}
+		$this->assertEquals(
+			6,
+			$wpdb->get_var( "SELECT COUNT(*) FROM `$wpdb->statify`" ),
+			'Unexpected number of entries after cleanup without aggregation'
+		);
+
+		// Run the cron job with aggregation (default).
+		remove_filter( 'statify__skip_aggregation', '__return_true' );
+		Statify_Cron::cleanup_data();
+		$this->assertEquals(
+			3,
+			$wpdb->get_var( "SELECT COUNT(*) FROM `$wpdb->statify`" ),
+			'Unexpected number of entries after cleanup with aggregation'
+		);
 	}
 
 	/**