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Generalize taxonomy queries:

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* transform wp_tax_query() into WP_Object_Query::get_tax_sql()
	* create parse_tax_query() method in WP_Query
	* add doc-block for $tax_query and $meta_query
See #15032. See #12891.


git-svn-id: https://develop.svn.wordpress.org/trunk@15731 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
scribu
2010-10-06 10:40:30 +00:00
parent 5a14ba3fa3
commit 448f74675a
3 changed files with 190 additions and 162 deletions
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wp-includes/classes.php
+72 -1
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@@ -535,7 +535,17 @@ class WP {
class WP_Object_Query {
/**
* Metadata query
* List of metadata queries
*
* A query is an associative array:
* - 'key' string The meta key
* - 'value' string|array The meta value
* - 'compare' (optional) string How to compare the key to the value.
* Possible values: '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'IN', 'BETWEEN'.
* Default: '='
* - 'type' string (optional) The type of the value.
* Possible values: 'NUMERIC', 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', 'UNSIGNED'.
* Default: 'CHAR'
*
* @since 3.1.0
* @access public
@@ -543,6 +553,27 @@ class WP_Object_Query {
*/
var $meta_query = array();
/*
* List of taxonomy queries
*
* A query is an associative array:
* - 'taxonomy' string|array The taxonomy being queried
* - 'terms' string|array The list of terms
* - 'field' string (optional) Which term field is being used.
* Possible values: 'term_id', 'slug' or 'name'
* Default: 'slug'
* - 'operator' string (optional)
* Possible values: 'IN' and 'NOT IN'.
* Default: 'IN'
* - 'include_children' bool (optional) Wether to include child terms.
* Default: true
*
* @since 3.1.0
* @access public
* @var array
*/
var $tax_query = array();
/*
* Populates the $meta_query property
*
@@ -573,6 +604,8 @@ class WP_Object_Query {
* @access protected
* @since 3.1.0
*
* @uses $this->meta_query
*
* @param string $primary_table
* @param string $primary_id_column
* @param string $meta_table
@@ -645,6 +678,44 @@ class WP_Object_Query {
return array( $join, $where );
}
/*
* Used internally to generate an SQL string for searching across multiple taxonomies
*
* @access protected
* @since 3.1.0
*
* @uses $this->tax_query
*
* @param string $object_id_column
* @return string
*/
function get_tax_sql( $object_id_column ) {
global $wpdb;
$sql = array();
foreach ( $this->tax_query as $query ) {
if ( !isset( $query['include_children'] ) )
$query['include_children'] = true;
$query['do_query'] = false;
$sql[] = get_objects_in_term( $query['terms'], $query['taxonomy'], $query );
}
if ( 1 == count( $sql ) ) {
$ids = $wpdb->get_col( $sql[0] );
} else {
$r = "SELECT object_id FROM $wpdb->term_relationships WHERE 1=1";
foreach ( $sql as $query )
$r .= " AND object_id IN ($query)";
$ids = $wpdb->get_col( $r );
}
if ( !empty( $ids ) )
return " AND $object_id_column IN(" . implode( ', ', $ids ) . ")";
else
return ' AND 0 = 1';
}
/*
* Used internally to generate an SQL string for searching across multiple columns
*