posts_distinct_request is a WordPress PHP filter that allows you to modify the DISTINCT clause of a query.
This is especially useful for caching plugins.
Usage
add_filter('posts_distinct_request', 'your_custom_function', 10, 2);
function your_custom_function($distinct, $query) {
// your custom code here
return $distinct;
}
Parameters
- $distinct (string): The DISTINCT clause of the query.
- $query (WP_Query): The WP_Query instance (passed by reference).
More information
See WordPress Developer Resources: posts_distinct_request
Examples
Remove DISTINCT Clause
Remove the DISTINCT clause from the query to retrieve all rows.
function remove_distinct_clause($distinct, $query) {
$distinct = '';
return $distinct;
}
add_filter('posts_distinct_request', 'remove_distinct_clause', 10, 2);
Add Custom DISTINCT Clause
Add a custom DISTINCT clause to the query.
function custom_distinct_clause($distinct, $query) {
$distinct = 'DISTINCT custom_column';
return $distinct;
}
add_filter('posts_distinct_request', 'custom_distinct_clause', 10, 2);
Modify DISTINCT Clause Based on Custom Post Type
Modify the DISTINCT clause only for a specific custom post type.
function modify_distinct_for_custom_post_type($distinct, $query) {
if ('custom_post_type' === $query->get('post_type')) {
$distinct = 'DISTINCT custom_column';
}
return $distinct;
}
add_filter('posts_distinct_request', 'modify_distinct_for_custom_post_type', 10, 2);
Modify DISTINCT Clause Based on Category
Modify the DISTINCT clause only for posts in a specific category.
function modify_distinct_for_category($distinct, $query) {
if ($query->is_category('your-category-slug')) {
$distinct = 'DISTINCT custom_column';
}
return $distinct;
}
add_filter('posts_distinct_request', 'modify_distinct_for_category', 10, 2);
Modify DISTINCT Clause Based on Search Query
Modify the DISTINCT clause only for search results.
function modify_distinct_for_search($distinct, $query) {
if ($query->is_search()) {
$distinct = 'DISTINCT custom_column';
}
return $distinct;
}
add_filter('posts_distinct_request', 'modify_distinct_for_search', 10, 2);