> For the complete documentation index, see [llms.txt](https://docs.woohoo.dance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.woohoo.dance/ajax-filters/for-developers.md).

# For developers

#### `woohoo_loop_total_posts`

Filter the total post count used by the Ajax Query Count element and pagination.

```php
apply_filters( 'woohoo_loop_total_posts', int $total_posts, WP_Query $loop, array $args );
```

**Parameters:**

| Parameter      | Type       | Description                                                             |
| -------------- | ---------- | ----------------------------------------------------------------------- |
| `$total_posts` | `int`      | The computed total post count                                           |
| `$loop`        | `WP_Query` | The query object (post\_\_in may have been modified by pre\_get\_posts) |
| `$args`        | `array`    | The original query arguments passed to WP\_Query                        |

**Example — Variations as cards:**

When your shop archive shows each WooCommerce variation as its own card, Woohoo counts parent products but your loop displays variations. This filter lets you return the correct count:

```php
add_filter( 'woohoo_loop_total_posts', function( $total_posts, $loop, $args ) {
    $post_type = $loop->get( 'post_type' );
    if ( ! is_array( $post_type ) || ! in_array( 'product_variation', $post_type, true ) ) {
        return $total_posts;
    }
    $post_in = $loop->get( 'post__in' );
    if ( empty( $post_in ) || $post_in === [ 0 ] ) {
        return $total_posts;
    }
    return count( $post_in );
}, 10, 3 );
```

#### `woohoo_facet_term_counts`

Filter facet term counts before they are displayed. Runs after counts are computed and formatted, but before exclusions and ordering.

```php
apply_filters( 'woohoo_facet_term_counts', array $result, string $target_slug, string $target_tax, array $base_ids, bool $is_product_attribute );
```

**Parameters:**

| Parameter               | Type     | Description                                                                        |
| ----------------------- | -------- | ---------------------------------------------------------------------------------- |
| `$result`               | `array`  | Array of term data, each with `slug`, `name`, `count`, etc.                        |
| `$target_slug`          | `string` | The facet slug (e.g. `"serie"`)                                                    |
| `$target_tax`           | `string` | The taxonomy name (e.g. `"product_cat"`, `"pa_colore"`)                            |
| `$base_ids`             | `array`  | Post IDs currently in the filtered result set                                      |
| `$is_product_attribute` | `bool`   | `true` for WooCommerce product attributes (`pa_*`), `false` for regular taxonomies |

**Example — Multiply taxonomy counts by variation count:**

When showing variations as cards, taxonomy facets (Category, Serie) count parent products. But your shop displays N cards per product (one per variation). This filter multiplies the count:

```php
add_filter( 'woohoo_facet_term_counts', function( $result, $slug, $tax, $base_ids, $is_attr ) {
    // Attribute facets (pa_colore) already have correct counts — skip them.
    if ( $is_attr || empty( $result ) ) {
        return $result;
    }

    foreach ( $result as $i => $term ) {
        // Your logic to multiply count by variations per product.
        // See woohoo-variations-as-cards plugin for a full implementation.
    }

    return $result;
}, 10, 5 );
```

#### `woohoo_filters/indexer/get_rows`

Filter the index rows before they are inserted into the Woohoo index table. Use this to add extra rows for data that Woohoo doesn't index by default.

```php
apply_filters( 'woohoo_filters/indexer/get_rows', array $rows, int $object_id, array $facet );
```

**Example — Index variation attributes on the parent product:**

WooCommerce stores attributes like `pa_colore` on variations, not on the parent product. Without this, the Color facet returns no results for variable products:

```php
add_filter( 'woohoo_filters/indexer/get_rows', function( $rows, $object_id, $facet ) {
    $source = $facet['source'] ?? '';
    if ( strpos( $source, 'attribute/' ) !== 0 ) {
        return $rows;
    }
    $taxonomy = 'pa_' . str_replace( 'attribute/', '', $source );
    $product  = wc_get_product( $object_id );
    if ( ! $product || ! $product->is_type( 'variable' ) ) {
        return $rows;
    }
    foreach ( $product->get_children() as $variation_id ) {
        $terms = wp_get_object_terms( $variation_id, $taxonomy );
        foreach ( $terms as $term ) {
            $rows[] = [
                'object_id'    => $object_id,
                'slug'         => $facet['slug'],
                'facet_value'  => $term->slug,
                'facet_name'   => $term->name,
                'facet_id'     => $term->term_id,
                'facet_parent' => $term->parent,
                'facet_order'  => $term->term_order ?? 0,
            ];
        }
    }
    return $rows;
}, 10, 3 );
```


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