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Taxonomy: Force a `DISTINCT` term query when result count matters. 

Generally, duplicate terms returned by a term query are eliminated in PHP,
after the database query takes place. This technique doesn't work properly
when the query parameters specify the `number` of results, since the results
of a `SELECT ... LIMIT x...` query may be deduplicated to a count less than
`x`. In these cases, we force the original query to be `DISTINCT`.

Props elvishp2006.
Fixes #41796.

git-svn-id: https://develop.svn.wordpress.org/trunk@41377 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Boone Gorges 2017-09-13 14:47:07 +00:00
parent dbace684e2
commit fb227caed1
2 changed files with 70 additions and 2 deletions
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15
src/wp-includes/class-wp-term-query.php
View File

@ -551,6 +551,16 @@ class WP_Term_Query {
$limits = '';
}
$do_distinct = false;
/*
* Duplicate terms are generally removed when necessary after the database query.
* But when a LIMIT clause is included in the query, we let MySQL enforce
* distinctness so the count is correct.
*/
if ( ! empty( $limits ) && 'all_with_object_id' !== $args['fields'] ) {
$do_distinct = true;
}
if ( ! empty( $args['search'] ) ) {
$this->sql_clauses['where']['search'] = $this->get_search_sql( $args['search'] );
@ -568,8 +578,7 @@ class WP_Term_Query {
if ( ! empty( $meta_clauses ) ) {
$join .= $mq_sql['join'];
$this->sql_clauses['where']['meta_query'] = preg_replace( '/^\s*AND\s*/', '', $mq_sql['where'] );
$distinct .= "DISTINCT";
$do_distinct = true;
}
$selects = array();
@ -631,6 +640,8 @@ class WP_Term_Query {
$where = implode( ' AND ', $this->sql_clauses['where'] );
$distinct = $do_distinct ? 'DISTINCT' : '';
/**
* Filters the terms query SQL clauses.
*

57
tests/phpunit/tests/term/query.php
View File

@ -427,4 +427,61 @@ class Tests_Term_Query extends WP_UnitTestCase {
$terms = wp_get_object_terms( $post_id, array( 'category', 'wptests_tax' ) );
$this->assertEquals( array( $term_ids[1], $term_ids[0], 1 ), wp_list_pluck( $terms, 'term_id' ) );
}
/**
* @ticket 41796
*/
public function test_number_should_work_with_object_ids() {
register_taxonomy( 'wptests_tax', 'post' );
$term_1 = self::factory()->term->create( array(
'taxonomy' => 'wptests_tax',
) );
$term_2 = self::factory()->term->create( array(
'taxonomy' => 'wptests_tax',
) );
$post_1 = self::factory()->post->create();
$post_2 = self::factory()->post->create();
wp_set_object_terms( $post_1, array( $term_1, $term_2 ), 'wptests_tax' );
wp_set_object_terms( $post_2, array( $term_1 ), 'wptests_tax' );
$q = new WP_Term_Query( array(
'taxonomy' => 'wptests_tax',
'object_ids' => array( $post_1, $post_2 ),
'number' => 2,
) );
$this->assertEqualSets( array( $term_1, $term_2 ), wp_list_pluck( $q->terms, 'term_id' ) );
}
/**
* @ticket 41796
*/
public function test_number_should_work_with_object_ids_and_all_with_object_id() {
register_taxonomy( 'wptests_tax', 'post' );
$term_1 = self::factory()->term->create( array(
'taxonomy' => 'wptests_tax',
) );
$term_2 = self::factory()->term->create( array(
'taxonomy' => 'wptests_tax',
) );
$post_1 = self::factory()->post->create();
$post_2 = self::factory()->post->create();
wp_set_object_terms( $post_1, array( $term_1, $term_2 ), 'wptests_tax' );
wp_set_object_terms( $post_2, array( $term_1 ), 'wptests_tax' );
$q = new WP_Term_Query( array(
'taxonomy' => 'wptests_tax',
'object_ids' => array( $post_1, $post_2 ),
'fields' => 'all_with_object_id',
'number' => 2,
) );
$this->assertEqualSets( array( $term_1, $term_1 ), wp_list_pluck( $q->terms, 'term_id' ) );
}
}