How to Use Laravel's `whereIn` with a Subquery?

Laravel Subquery with WHERE IN Clause

A common task in Laravel is to retrieve data using a subquery within a WHERE IN clause. To achieve this, you can utilize the whereIn() method with a closure.

For instance, let's say you have the following query:

SELECT 
    `p`.`id`,
    `p`.`name`, 
    `p`.`img`, 
    `p`.`safe_name`, 
    `p`.`sku`, 
    `p`.`productstatusid` 
FROM `products` p 
WHERE `p`.`id` IN (
    SELECT 
        `product_id` 
    FROM `product_category`
    WHERE `category_id` IN ('223', '15')
)
AND `p`.`active`=1

To translate this query into Laravel, you can use the following code:

Products::whereIn('id', function($query){
    $query->select('paper_type_id')
    ->from(with(new ProductCategory)->getTable())
    ->whereIn('category_id', ['223', '15'])
    ->where('active', 1);
})
->get();

In this code:

• Products::whereIn('id', ...) starts the subquery within the WHERE IN clause.
• The closure function defines the subquery.
• $query->select('paper_type_id') selects the column to be returned from the subquery.
• $query->from(with(new ProductCategory)->getTable()) specifies the table to be used in the subquery.
• $query->whereIn('category_id', ['223', '15']) adds the conditions to the subquery.
• $query->where('active', 1) adds another condition to the subquery.
• ->get() retrieves the results.

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