How to add out of stock product to cart programmatically in Magento 2.3

Question

I'm using Magento v2.3, I want to add out of stock products to cart without changing any configuration from backend.

I'm using following function to add product to cart

addProduct($productInfo, $requestInfo)

from following class

Magento\Checkout\Model\Cart

But it checks for saleable quantity.

Is there any way to ignore saleable check and add out of stock products to cart?

Answer 1

If you want to add out of stock products to cart without changing any configuration from the backend then you have added enable super mode of the product during add to card

    $productInfo->setIsSuperMode(true) ; 

...->addProduct($productInfo, $requestInfo);

Answer 2

Just an idea, I didn't test yet. I hope it helps.

1. We can set session variable skip_is_saleable==true before your add product logic
2. Then override the public function isSaleable() function by di.xml and check the above session variable
3. If you found skip_is_saleable==true, always return true in isSaleable function. Otherwise, leave it as a core step in isSaleable so that it does not affect the default flow.
4. Finally, clear the session variable skip_is_saleable