[Grouped product] Can´t add simple products to cart if one other is out of stock

[JadeArtistry]

I have turned my theme and all extensions off and it seems to be a magento fault.

I only notice this happening when one or more of my simple product qty is 0 and other simple products under the group product are in stock.

I cannot add an in-stock simple product to cart if any of the simples in the group are out of stock.  It keeps repeating the message:  Please specify the quantity of product(s).

I believe this is a known issue reported in January 2019 here: https://github.com/magento/magento2/issues/22304

It has been fixed for Magento 2.4 release but how can I get the fix now for my Magento 2.3.4 instance?

[Madhu Rajawat]

Hi @JadeArtistry 

Please check the code and update file code same as given MR file changes:

https://github.com/magento/magento2/pull/24955/files

Hope this helps you!

Problem Solved! Click Kudos & Accept as Solution!

[JadeArtistry]

Thankyou.

Since it has been developed for magento 2.4 are these fixes backwards compatible with magento 2.3.4 do you know?  If they are I'll grab the 2 files under the Files Changed tab.

[Madhu Rajawat]

@JadeArtistry  Yes, It will be compatible for sure.

Try with updating the code file changes the same as MR changes.

Hope this helps you!

Problem Solved! Click Kudos & Accept as Solution!

[Madhu Rajawat]

@JadeArtistry  You can try with first one file changes then cover unit test changes

https://github.com/magento/magento2/commit/f27f74950a0fb961834bd4909015718e228a8ddf

First  file changes:

app/code/Magento/GroupedProduct/Model/Product/Type/Grouped.php

Second file Cover unit test changes:

app/code/Magento/GroupedProduct/Test/Unit/Model/Product/Type/GroupedTest.php

Hope this helps you!

Problem Solved! Click Kudos & Accept as Solution!

[Madhu Rajawat]

@JadeArtistry  Hope this solution helps you!

If Problem Solved! Click Kudos & Accept as Solution!

[JadeArtistry]

So I can get this absolutely right.  You've been very patient with me so far.

Do I need to create the Magento folder under app/code?  I do not currently have one there.

And what is the second file used for?  Is it required?

[Madhu Rajawat]

@JadeArtistry  you can find this on   

Vendor/magento/ directory. 

vendor/magento/module_groupedproduct/Model/Product/Type/Grouped.php directory. 

you can override the model GroupedProduct/Model/Product/Type/Grouped.php with creating a custom module.

[Madhu Rajawat]

@JadeArtistry 

Hope this solution helps you!

If Problem Solved! Click Kudos & Accept as Solution!

[JadeArtistry]

I have created this path:

http/app/code/Magento/GroupedProduct/Model/Product/Type/Grouped.php

and updated the Grouped.php file same as https://github.com/magento/magento2/pull/24955/files   only 1 line change at 347 it seems.

My file can be seen here: https://drive.google.com/file/d/1ivXAK6nwX5Ss7iugvwK9LF-3RJH0hqfD/view?usp=sharing

Its not working on my version magento 2.3.4, likely I've missed something.