Check if post exists

features/post.feature

@@ -264,13 +264,13 @@ Feature: Manage WordPress posts
     When I run `wp post url-to-id {POST_URL}`
     Then STDOUT should contain:
       """
-      {POST_ID}
+      1
       """
 
-    When I run `wp post url-to-id non-existent-url`
-    Then STDOUT should contain:
+    When I try `wp post url-to-id 'https://example.com/?p=404'`
+    Then STDERR should contain:
       """
-      Could not get post with url 'non-existent-url'.
+      Could not get post with url https://example.com/?p=404.
       """
 
   Scenario: Update a post from file or STDIN

src/Post_Command.php

@@ -889,15 +889,17 @@ public function generate( $args, $assoc_args ) {
 	 * ## EXAMPLES
 	 *
 	 *     # Get post ID by URL
-	 *     $ wp post url-to-id post-url
+	 *     $ wp post url-to-id https://example.com/?p=1
 	 *
 	 * @subcommand url-to-id
 	 */
 	public function url_to_id( $args, $assoc_args ) {
 		$post_id = url_to_postid( $args[0] );
 
-		if ( ! $post_id ) {
-			WP_CLI::error( "Could not get post with url '$args[0]'." );
+		$post = get_post( $post_id );
+
+		if ( null === $post ) {
+			WP_CLI::error( "Could not get post with url $args[0]." );
 		}
 
 		WP_CLI::print_value( $post_id, $assoc_args );