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Improve querying for terms with falsey names and slugs.

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Prior to [38677], `get_term_by()` would always return false if
an empty string were passed as the queried 'name' or 'slug'. The
refactor to use `get_terms()` broke this behavior; inappropriately
imprecise `empty()` checks caused the 'name' or 'slug' clause to be
discarded altogether when fetching terms, resulting in an incorrect
term being returned from the function.

We fix the regression by special-casing truly empty values passed
to `get_term_by()`, and ensuring that `WP_Term_Query` is properly
able to handle `0` and `'0'` term queries.

Props sstoqnov.
Fixes #21760.

git-svn-id: https://develop.svn.wordpress.org/trunk@40293 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Boone Gorges
2017-03-16 02:03:53 +00:00
parent 24b221bd34
commit 79cfdbd84c
4 changed files with 112 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/wp-includes/class-wp-term-query.php
View File

@@ -474,7 +474,10 @@ class WP_Term_Query {
$this->sql_clauses['where']['exclusions'] = preg_replace( '/^\s*AND\s*/', '', $exclusions );
}
if ( ! empty( $args['name'] ) ) {
if (
( ! empty( $args['name'] ) ) ||
( is_string( $args['name'] ) && 0 !== strlen( $args['name'] ) )
) {
$names = (array) $args['name'];
foreach ( $names as &$_name ) {
// `sanitize_term_field()` returns slashed data.
@@ -484,7 +487,10 @@ class WP_Term_Query {
$this->sql_clauses['where']['name'] = "t.name IN ('" . implode( "', '", array_map( 'esc_sql', $names ) ) . "')";
}
if ( ! empty( $args['slug'] ) ) {
if (
( ! empty( $args['slug'] ) ) ||
( is_string( $args['slug'] ) && 0 !== strlen( $args['slug'] ) )
) {
if ( is_array( $args['slug'] ) ) {
$slug = array_map( 'sanitize_title', $args['slug'] );
$this->sql_clauses['where']['slug'] = "t.slug IN ('" . implode( "', '", $slug ) . "')";

9
src/wp-includes/taxonomy.php
View File

@@ -835,6 +835,15 @@ function get_term_by( $field, $value, $taxonomy = '', $output = OBJECT, $filter
return false;
}
// No need to perform a query for empty 'slug' or 'name'.
if ( 'slug' === $field || 'name' === $field ) {
$value = (string) $value;
if ( 0 === strlen( $value ) ) {
return false;
}
}
if ( 'id' === $field || 'term_id' === $field ) {
$term = get_term( (int) $value, $taxonomy, $output, $filter );
if ( is_wp_error( $term ) || null === $term ) {