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Add more taxonomy options to the post navigation link #48912

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merged 30 commits into from
Jan 12, 2024

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carolinan
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@carolinan carolinan commented Mar 8, 2023

What?

Updated Nov 6 2023.

This PR adds support for two parameters of get_next_post_link / get_previous_post_link that were not supported by the block.

$in_same_term bool Optional
Whether link should be in a same taxonomy term.
Default: false

$taxonomy string Optional
Taxonomy, if $in_same_term is true. Default 'category'.
Default: 'category'

  • The feature for excluding terms was initially included, but has been removed based on feedback that it was too confusing.

Closes #47090

Why?

The features are available in classic themes but were missing from the block. The feature allows site creators and developers to limit what should be included as a next and previous link.

This allows site creators to for example add a 'news' category to some posts, and only link to the other posts in this category.

How?

Adds a select list with taxonomies under the Advanced panel. Selecting a taxonomy in this list will limit the next and previous links.

To get a list of all supported taxonomies, including custom taxonomies, we need to know the post type.
I was not able to find any other way to get the post type besides using the core editor store.
If you know of a better way please comment on the PR.

Testing Instructions

Create three identical posts:
Add the posts to the "birds" category, or any new category that you want to add for the test.
Add the next and previous post navigation link blocks. Open the advanced panel and select category as the taxonomy.

View the first post on the front.
You should be able to navigate to the second post in the birds category, and from there, to the third post in the birds category.
When viewing the third post, the "next" link should not show.

Register a custom post type and custom taxonomy. The fastest way to do this is to enable a plugin with custom post types, I used https://wordpress.org/plugins/yoast-test-helper/.
Repeat the testing instructions above but use the custom post type and custom taxonomy (movie and genre for example).
Only the taxonomies supported by the post type should show in the taxonomy option.

Next, with a block theme active, please test the block in the Site Editor:
Go to Appearance > Editor > Templates, and edit the single post template.
Select or add the post navigation link blocks, and enable the filter under the Advanced panel.
Save the template changes.
Confirm that the placeholder in the Site Editor is the same, and that the correct posts are linked on the front of the website.

Screenshots or screencast

Filter option under the Advanced panel

@carolinan carolinan added the [Block] Post Navigation Link Affects the Post Navigation Link Block label Mar 8, 2023
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github-actions bot commented Mar 8, 2023

Size Change: +202 B (0%)

Total Size: 1.69 MB

Filename Size Change
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build/wordcount/index.min.js 1.03 kB

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@carolinan carolinan added the [Type] Enhancement A suggestion for improvement. label Mar 11, 2023
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github-actions bot commented Mar 14, 2023

Flaky tests detected in 54a58bb.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/6770650485
📝 Reported issues:

@carolinan carolinan marked this pull request as ready for review March 14, 2023 08:31
@carolinan carolinan changed the title Add filters to post navigation link Add more taxonomy options to the post navigation link Mar 29, 2023
@carolinan carolinan requested a review from ndiego as a code owner May 11, 2023 07:38
@carolinan carolinan requested a review from mikachan June 14, 2023 08:32
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I've tested this out and it's working well for me 🎉

  • You should be able to navigate to the second post in the birds category, and from there, to the third post in the birds category. ✅
  • When viewing the third post, the "next" link should not show. ✅
  • The next link should link to post number four that you just created, post 2 and 3 should be excluded. ✅
  • Only the taxonomies supported by the post type should show in the taxonomy option. ✅

I've left some minor inline comments.

packages/block-library/src/post-navigation-link/block.json Outdated Show resolved Hide resolved
packages/block-library/src/post-navigation-link/edit.js Outdated Show resolved Hide resolved
@richtabor
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Perhaps the toggle label should be “Filter by taxonomy”

@carolinan
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Perhaps the toggle label should be “Filter by taxonomy”

Yes! Much better.

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Looks good to me!

@carolinan
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carolinan commented Aug 11, 2023

What we could do is move one or both settings to the Advanced panel.
Also, I would prefer to not have the same arguments as with the excerpt length setting, so I'd like the option to turn this off.

@carolinan carolinan requested a review from mikachan August 11, 2023 10:56
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carolinan commented Aug 11, 2023

I was thinking something like this:

block.json:

	"attributes": {
		"textAlign": {
			"type": "string"
		},
		"type": {
			"type": "string",
			"default": "next"
		},
		"label": {
			"type": "string"
		},
		"showTitle": {
			"type": "boolean",
			"default": false
		},
		"linkLabel": {
			"type": "boolean",
			"default": false
		},
		"arrow": {
			"type": "string",
			"default": "none"
		},
		"allowFilters": {.  <----- This is the new attribute
			"type": "boolean",
			"default": true
		},
		"excludedTerms": {
			"type": "string",
			"default": ""
		},
		"inSameTerm": {
			"type": "boolean",
			"default": false
		},
		"taxonomy": {
			"type": "string",
			"default": ""
		}
	},

In Edit.js there would be a conditional that checks if allowFilters is true, and if not, the controls are not visible.

And then to turn the filter off and set defaults:

<?php
function filter_metadata_registration( $metadata ) {
	if ( 'core/post-navigation-link' === $metadata['name'] ) {
		$metadata['attributes']['allowFilters'] = array(
			'type'    => 'boolean',
			'default' => false,
		);
		$metadata['attributes']['excludedTerms'] = array(
			'type'    => 'string',
			'default' => 'uncategorized',
		);
		$metadata['attributes']['inSameTerm'] = array(
			'type'    => 'boolean',
			'default' => 'true',
		);
		$metadata['attributes']['taxonomy'] = array(
			'type'    => 'string',
			'default' => 'category',
		);
	}
	return $metadata;
};
add_filter( 'block_type_metadata', 'filter_metadata_registration' );

I haven't gotten it to work yet; If the block already has a term added to the excludedTerms, adding another term by using the filter only seems to combine the terms, not reset them.
I mean that turning the UI off with the filter does not reset previous user settings. Should it?

@carolinan
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@WordPress/block-themers Hi people, I would appreciate your thoughts about this feature and the suggestion from August 11 (above) about allowing it to be disabled.

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I think this is a great addition to this block!

packages/block-library/src/post-navigation-link/edit.js Outdated Show resolved Hide resolved
.filter(
( tax ) =>
tax.slug !== 'nav_menu' &&
tax.slug !== 'wp_pattern_category'
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The pattern category shows in the option in Site Editor unless it is removed here.

If the "New admin views" Gutenberg experiment is enabled, data views also show in the option. I did not hide it since it is still experimental.

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Is this conditional statement really necessary? I hesitate to hardcode specific taxonomy slugs into blocks. For example, in a query loop block, no such condition exists.

export const useTaxonomies = ( postType ) => {
const taxonomies = useSelect(
( select ) => {
const { getTaxonomies } = select( coreStore );
const filteredTaxonomies = getTaxonomies( {
type: postType,
per_page: -1,
context: 'view',
} );
return filteredTaxonomies;
},
[ postType ]
);
return taxonomies;
};

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I simply deleted the filter and nothing changed in the interface. I am not sure what changed since November but neither the nav menu, pattern categories or the admin views are showing up now. Custom taxonomies, for standard and for custom post types are showing correctly as well.

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I don't know about the navigation menu and admin view, but it seems that public has been changed to false in the pattern category.

@draganescu draganescu merged commit f461b17 into trunk Jan 12, 2024
56 checks passed
@draganescu draganescu deleted the update/post-navigation-link branch January 12, 2024 13:45
@github-actions github-actions bot added this to the Gutenberg 17.6 milestone Jan 12, 2024
Comment on lines +169 to +172
setAttributes( {
taxonomy: value,
inSameTerm: value === '' ? false : true,
} )
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The value of isSameTerm depends only on whether the value of taxonomy is empty. So, can this attribute be removed and not determined during dynamic rendering?

@carolinan
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@draganescu can you revert the commit? I'd rather not deal with another deprecation.

@carolinan
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It is disheartening to work on something for close to a year and not receive code reviews until commit, it has become quiet difficult to find willing reviewers the past 6 months, -and it is not a problem with one pull request but most of them. All I can do is ping people.

@carolinan
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I want to contribute to the project on issues that matter and are on the roadmap, not work on things that are not worthy peoples time to review.

@t-hamano
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can you revert the commit? I'd rather not deal with another deprecation.

If I understand correctly, this block is a dynamic block, so if we don't need to migrate existing attributes, I think we don't need the deprecation, and we don't need to revert. If there is something that can be improved, I think it would be a good idea to commit to it as a follow-up.

@carolinan
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Then I hope that with both your help I can fix it before 17.6.

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[Block] Post Navigation Link Affects the Post Navigation Link Block [Type] Enhancement A suggestion for improvement.
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Restrict gutenberg block next post & previous post to same category
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