Patterns: Proper handling when a pattern does not have a title

[t-hamano]

What problem does this address?

When registering a pattern from the Site Editor, it can be registered without a title.

This in itself may need to be prevented, but since the pattern is a type of post, you can create a pattern without a title from post-new.php?post_type=wp_block. Therefore, I think we need to properly handle the assumption that the pattern has no title.

As far as I have encountered, the following problems have occurred in the no-title pattern.

• Title is not displayed in the pattern library: fixed by Patterns: Use slug as fallback for empty title #54731

Screenshot

• The post ID is displayed as the title in the pattern detail page or editor canvas: fixed by Patterns: Require a title in the creation modal #54717

Screenshot

• When deleting a pattern, the title part is blank in the confirmation dialog box.: fixed by Patterns: Use slug as fallback for empty title #54731

Screenshot

• When duplicating a pattern, an error occurs.

It turns out that this problem occurs not when the title is empty, but when it doesn't have a category. I have newly reported it as #54729.

Screenshot

• When exporting a pattern, the file name is json.json: fixed by Patterns: Use slug as fallback for empty title #54731

Screenshot

• Import fails because the title of the exported file is an empty string: fixed by Patterns: Use slug as fallback for empty title #54731

Screenshot

What is your proposed solution?

As for the Javascript error, I think it should be corrected fixed. As far as displaying the title, I think it should have a fallback title, such as "(no title)" or "the pattern".

[Mamaduka]

The template parts require a name. Maybe we should match that behavior.

[t-hamano]

Thank you @Mamaduka for submitting #54693, which requires a title to be entered when creating a pattern!

However, once you have created the pattern, you can update the title to empty from the post type list. Doing so will cause the problem again as mentioned in this issue.

However, the following issue has been resolved as the slug is now properly created from the title when creating the pattern.

The post ID is displayed as the title in the pattern detail page or editor canvas

The screencast below explains the problem.

705b249b0fdb1ad1569bbd66eea15c6d.mp4

[Mamaduka]

Good point. I think we need to provide fallbacks when the title is intentionally removed.

I'll re-open the issue for follow-ups.

[t-hamano]

I was just writing the code for that 👍

[t-hamano]

When duplicating a pattern, an error occurs.

It turns out that this problem occurs not when the title is empty, but when it doesn't have a category. I have newly reported it as #54729.

[t-hamano]

#54731 resolved the remaining problems in this issue.