Image block and post_mime_type

[ethanclevenger91]

Describe the bug
The Gutenberg image block adds 'post_mime_type' => 'image' to the media modal's search queries (the query-attachments AJAX action). The classic editor didn't add this parameter.

ElasticPress translates post_mime_type to an exact match, but in wp_post_mime_type_where(), which WP_Query uses to parse that argument, if there's no / in the post_mime_type, the resulting SQL wildcards the second half of the mime type, so LIKE 'image/%' (for this specific case).

While admin-side functionality isn't the default for this plugin, updating this logic would make it more seamless.

Steps to Reproduce

1. Install/configure ElasticPress, Classic Editor plugin
2. Enable document indexing
3. Enable admin and AJAX via ep_admin_wp_query_integration and ep_ajax_wp_query_integration
4. Add an image to the media library
5. Create a new post
6. Edit with classic editor
7. Use the "Add Media" button to open the media modal
8. See your image
9. Use the search bar to search for your image
10. Still see your image
11. Close out. Edit a post with the block editor.
12. Add a new image block to bring up the media modal
13. See your image
14. Use the search bar to search for your image
15. See no results returned

Expected behavior
Image search results in the admin should be consistent.

Environment information

• Device: ThinkPad
• OS: Windows
• Browser and version: Firefox
• Plugins and version: ElasticPress, latest
• Theme and version: Custom
• Other installed plugin(s) and version(s): I can provide this if the above steps fail to reproduce

Additional context
Current workaround is a pre_get_posts filter:

public function query_attachments( &$query ) {
	if( !wp_doing_ajax() || $_POST['action'] != 'query-attachments' ) {
		return;
	}

	$query->set('post_mime_type', '');
}

[brandwaffle]

@ethanclevenger91 agreed this would be a good thing to get working. Currently, the only way I'm aware of to create a partial match in Elasticsearch is to map this particular field with the ngram analyzer, which enables partial string matches. That could create some indexing overhead, so I'm also wondering if perhaps we could shortcut this by splitting the 'image/' string into an array of each part, so that we could exact match on just 'image' across any images regardless of format. @tlovett1 any thoughts?

[tlovett1]

This is admin search correct @ethanclevenger91? I assume you have the Protected Content feature enabled?

[ethanclevenger91]

Admin - correct. I didn't have the Protected Content feature enabled, though I'm enabling it now after better understanding what it does.

[felipeelia]

I'm working on it.

[roborourke]

I just ran into this - doesn't seem to be fixed in the latest version. The issue is that the plugin assumes if a string value is passed then it's a truncated / prefix mime type and if it's an array then they're fully qualified:

https://github.com/10up/ElasticPress/blob/develop/includes/classes/Indexable/Post/Post.php#L907-L934

This isn't exactly reliable as the image block shows but WP will accept any combination of those truncated and fully qualified values.

I've got a temporary workaround here:

https://github.com/humanmade/altis-enhanced-search/pull/98/files

The latter part of it will nicely handle whatever is passed to the post_mime_type WP_Query argument (after converting that value to an array if a string was given:

https://github.com/humanmade/altis-enhanced-search/pull/98/files#diff-2d9bc91244a2cb57445498ad1c971f7dR318-R349

I'll make a PR as soon as I can.

[felipeelia]

We can use wp_get_mime_types to check which mime types exist and search for all of them. So, for image/% it would mean [ 'image/jpeg', 'image/gif', 'image/png', 'image/bmp', 'image/tiff', 'image/x-icon', 'image/heic' ]