Filtered exports drop attachments and featured images

[billseymour]

When using Tools>Export, targeting a specific author, the resulting XML file does not contain a reference/link to any Featured Image (thumbnail) associated with these posts.

On the other hand, Tools>Export "all content" (including all authors) produces an XML file that does contain reference/link to Featured Image.

Request: Have Tools>Export "specific author" generate the same metadata as the "all content" export, so that Export "specific author" will also include metadata reference to the Featured Image.

Many people (including myself) use "specific author" as a way to export some, but not all, posts. Full metadata would really help. Thanks.

[duck_]

The problem isn't missing meta data (see <wp:meta_key>_thumbnail_id</wp:meta_key>). Rather the fact that no attachments are exported/imported so the reference doesn't mean anything in the imported install.

[duck_]

Marked #19591 as dupe. Definitely present in 3.0, and I'm pretty sure it was present earlier than that but I haven't checked.

Related: #19307

[rcain]

thought it might be helpful to suggest a very simple solution to this:

can we not have an 'export attachments only' option (alongside 'export posts only', etc)?

i've just implemented similar in the old advanced-export-forwp-wpmu plugin here : ​http://wordpress.org/support/topic/plugin-advanced-export-for-wp-wpmu-how-to-export-attachments-only - which i believe is pretty similar code.

since big exports generally have to be done in smaller batches anyway, exporting attachments separately seems logical.

on the flip-side, there still appear to be some issues with the wordpress-importer plugin (eg: ​http://wordpress.org/support/topic/plugin-wordpress-importer-not-importing-any-images-at-all), but this would seem a practical step in the right direction.

[jghazally]

Include attachments for specific post_types

[jghazally]

Hi I just came across this problem when trying to import a CPT, the featured images (and other attachments) are not included in the xml file. I have attached a patch above to fix my issue which is fairly basic and can probably be improved. It can also be made to utilize a checkbox as per @rcain 's suggestion.
Hope this helps core out.

best
jeff

[smub]

Just ran into this issue. This also breaks conditionals like has_post_thumbnail() ... Just exported about 24 posts from a site to test on local dev environment (building a new theme). Put up some dummy thumbnails on few articles. Then added a custom field for image URLs (just to simulate posts from pre WP 2.9)... Was running a conditional and it wasn't working. Spend all the time just to realize it was because an attachment ID was saved. So while it doesn't display a thumbnail that is attached, it stores an ID in the database thus causing the conditional to return TRUE when it is not.

[travisnorthcutt]

A big fat +1 from me on this. My use case was exporting/importing a custom post type with associated featured images. The code posted by @jghazally worked *perfectly* for me.

[jghazally]

If someone wants to give me an idea of what sort of UI / form elements we want to use, and a hand getting started on Unit Testing this would love to help...

best
jeff

[batmoo]

export_attachments_for_cpt.diff works pretty nicely. Would be nice to get this into 3.5.

[axwax]

+1 on getting that patch by @jghazally into 3.5,
as in its current form it does indeed mess up the database as @smub mentioned above...

[creativeslice]

We've been able to get this to work with a hack to the Advanced Export plugin, however it's quite brittle and only allows you to filter by date and author, not category. It would be great to have this fixed in core so exporting a range of posts works without dropping images.

[dlocc]

Thanks to the export_attachments_for_cpt.diff for working great! I'm happy I found this... saved me bunches of time. Why wasn't this included in 3.5? It should definitely be rolled out.

[jghazally]

@dlocc the export system is getting overhauled and a new API is being developed see #22435

[nacin]

Really, this is a bug.

The patch seems OK, but I'm not sure about it. A few issues:

• How well will that query work when there are a lot of post IDs? It's possible that you could be exporting tens of thousands of post IDs of a single type. The IN would get too long at some point.
• Unless my memory is failing me, featured images aren't necessarily attached to posts. We'd need to check each post's metadata and append the post to the posts to export if it is missing.

[nacin]

Some concerns still.

[wonderboymusic]

Featured images are always related by a post meta entry, not necessarily by post_parent. Needs a new patch.

[Ganon]

Export with attachments and thumbnails

[Ganon]

I've attached a patch that should comply with your requirements, gets the thumbnail from the postmeta and doesn't creates long queries.

[Ganon]

Hmm, could we have this scheduled for the next release?

[hlashbrooke]

Just to note - I made a few significant improvements to the export function in #27048 - I wasn't directly intending to fix this issue with attachments, but it was indirectly fixed in that patch.

This pull request fixes an issue where attachments are not included when exporting posts, unless you choose the "all" option.

A unit test is also included.

Trac ticket: 17379

[nateallen]

I cleaned up the code a bit and adding a new unit test. I'm hopeful we can finally merge this fix into WordPress core. Given that the bug has caused frustration for WordPress users for more than a decade, I'm eager to see it resolved at last!

To test this patch:

1. Create a post and add a featured image
2. Go to Tools > Export
3. Select the Posts option
4. Choose an author
5. Click "Download Export File"

The export file should contain your post and the attachment. Without the patch, you should only see the post.

[fischfood]

Test Report

This report validates that the indicated patch addresses the issue.
Patch tested: ​https://github.com/WordPress/wordpress-develop/pull/4245/
Environment
OS: macOS 12.4
PHP: 8.0.16
WordPress: 6.1.1
Browser: Brave 1.48.164, Chrome 111.0.5563.64
Theme: Twenty Twenty-Two

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Steps

• Updated wp-admin/includes/export.php on a live website for public image access
• Added a post to the live site with a featured image, and an image within the content
• On that site, I ran two exports, one for all posts with "Posts", and one for all posts by a specific author
• On a clean local site, I ran an import for each xml file, checking off the "Download and import file attachments" option, sacking the post and images in between the tests

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Results

• On both imports, a post was created with the featured image as well as the image within the content. Both images were uploaded into the Media Gallery.