Follow: Make sure Actor doesn't already exist before saving (#1904)

Author: obenland

includes/class-cli.php

@@ -239,6 +239,7 @@ public function move( $args ) {
 	 * ## EXAMPLES
 	 *
 	 *    $ wp activitypub follow https://example.com/@user
+	 *    $ wp --user=pfefferle activitypub follow https://example.com/@user
 	 *
 	 * @synopsis <remote_user>
 	 *

includes/collection/class-actors.php

@@ -561,7 +561,7 @@ public static function fetch_remote_by_uri( $actor_uri ) {
 			return $object;
 		}
 
-		$post_id = self::create( $object );
+		$post_id = self::upsert( $object );
 
 		if ( \is_wp_error( $post_id ) ) {
 			return $post_id;