Woocommerce产品的WP_Query中的Orderby价格问题

Question

I'm trying to sort my products by price but it doesn't work fine, it returns only 9 of my 56 products. All my products are similars, all are products with variations and attributes, so I don't know why it happends.

This is my code to get products, it works fine if I don't use the "orderby".

$args = [
"posts_per_page" => 20,
"paged"=> "1",
"tax_query" => [
    [
        "taxonomy" => "product_cat",
        "field" => "term_id",
        "terms" => "213",
        "operator" => "IN",
        "include_children" => false
    ],
    [
        "taxonomy" => "pa_color",
        "field" => "term_id",
        "terms" => [
            "red"
        ],
        "operator" => "IN"
    ],
    "relation" => "AND"
],
"post_type" => [
    "product",
    "product_variation"
],
"meta_query" => [
    [
        "key" => "_price",
        "value" => [
            "20",
            "30"
        ],
        "compare" => "BETWEEN",
        "type" => "NUMERIC"
    ],
    "relation" => "AND"
],
"orderby" => "meta_value_num",
"meta_key" => "_price",
"order" => "ASC"
]

$loop = new WP_Query( $args );

Answer 1

1) Regarding product variations:

• Woocommerce custom taxonomies as product categories or product tags are not enabled in product variations , but in their parent variable product .

• Product attributes (for variations) are not available through a tax query. For product variation they are set as meta data like attribute_pa_color (all keys starting by attribute_ ) and the value is a term slug for each one

So you can't make your query work for both post types product and product_variation .

Note: Product variations are not displayed by default in product loops . They are only displayed in cart items and order items

2) Regarding Variable products:

• Regarding prices for a variable product (since WooCommerce 3+) , their will be as many prices (meta key _prices ) as there is variations in it. So querying meta key _prices can make errors, as the first available price will be taken (or may be all of them or none) .
• Regarding product attributes it's not so simple as there is 2 kinds:
  • Normal product attributes (like for simple products)
  • Product attributes enabled for variations.

Note: Variable products are displayed by default in product loops, but they are never displayed in cart items and order items .

For all that reasons your query will not work properly anyways even with or without "orderby" => "meta_value_num", .

There is also some errors or mistakes in your query like:

• In your tax_query for "taxonomy" => "pa_color", the "field" need to be "slug" instead of "term_id" .
• 'post_status' => 'publish', is missing.
• "operator" => "IN" , "relation" => "AND" are not needed as they are default arguments.

So this doesn't solve your question, but show you that is not possible to do it on this way.