By MilanG

2019-07-09 13:36:52 8 Comments

I'm making a commerce site with Drupal 8 and Drupal commerce and I have a not so common request. Some of the products should be available to buy only in groups (bundles) with some other products. E.g. if you want to buy product A in quantity 100 you must also buy product B, product C and/or product D and sum of them (B+C+D) must also be 100. Other way it shouldn't be possible to buy any of them separately.

I saw that there are some Bundle modules (not even sure if they could fulfill this request), but they exist only for Drupal 7.

So is there some module for D8 which will allow grouping products like this. If not what would be the best way to achieve this feature?


@Jdrupal 2019-07-12 14:04:10

As far as I know, there are no supported modules to acheive what you want.

So if you want a sustainable and future proof solution, you should probably code it yourself.

I would go for solution, where I create a custom entity type, Product Validation.

Here are some fields, that I think it should contain:

  1. Product ID (The product it's active on).
  2. Applies above (quantity) (A minimum quantity that must be purchased, before the validation is applyed).
  3. Depending products (Products that be must purchased too).
  4. Min SUM (The minimum sum of all the depending products).

Those are just fields that should probably be there, you can always add more fields like, if only one of depending products must be purchased, or all of them, maybe also support for multiple product ID's to avoid creating duplicates, etc.

Then add a custom validate handler, when the user clicks the place order button on the cart page.

EDIT: To alter the cart form you could use hook_form_alter, and check if (strpos($form_id, 'views_form_commerce_cart_form_default') === 0. The cart form has a unique ID per order so that's why you want to do like that. Then you can add $form['#validate'][] = 'MY_MODULE_product_validation', where the logic will then be.

Your logic will look similar to this:

$product_validation = $entityTypeManager->getStorage('product_validation')->loadByProperties([
  'product_id' => $product->id(),

if (isset($product_validation)) {
  if ($product_validation->getAppliesAbove() > $product->quantity) {
    $total_quantity = 0;
    foreach ($product_validation->getDependingProducts() as $dep_product) {
      // Check if $dep_product has been added to cart.
      // If yes $total_quantity += $cart->getItem('something')->quantity.
    if ($product_validation->getMinSum() >= $total_quantity) {
      return TRUE;
    return $form_state->setError($form, 'something');

OBS: This code is using dummy variables and is intended to help you understand the logic, not as a "ready to implement" solution.

I hope it all makes sense.

@MilanG 2019-07-15 08:25:18

I was thinking of some similar solution (if there really is no bundle module) I just didn't know where exactly to hook. Is there appropriate hook where I can add my validation code or maybe some event to listen to? Do you maybe know that?

@Jdrupal 2019-07-15 08:35:15

As @TonyTheFerg mentions, there are the commerce_product_bundle module which is only released in a dev version, but using that module you would probably have to contribute to it, since it would only provide you with a starting point and not the complete solution. To alter the cart form you could use hook_form_alter, and check if (strpos($form_id, 'views_form_commerce_cart_form_default') === 0. The cart form has a unique ID per order so that's why you want to do like that. Then you can add $form['#validate'][] = 'MY_MODULE_product_validation', where the logic will then be.

@TonyTheFerg 2019-07-14 02:30:41

Drupal Commerce doesn't currently have a STABLE bundle module ported to 8, but if you like living on the edge, commerce_product_bundles which is under development MIGHT be able to get the job done. You can assign multiple bundle items (a product wrapped in a bundle item) to a bundle group (a group of bundle items sold together), and can specify the minimum and maximum quantities for each of those bundle items, as well as a new selling price if you like.

You might be limited setting the minimum and maximum quantities of Products B, C, D to reach 100 the way you mentioned, in that you would need to give a fixed quantity range to B,C and D. (like 34, 33, 33 etc) But you certainly can require/allow the 100 of A, and predetermine a satisfactory combo of B,C,D equaling 100. You can also require products B,C,D, and not require A... etc. You'd have to test it with your use case to see if it's sufficient.

The docs don't explain the full function of the D8 development version, but you can read their brainstorming session here:

Just beware, when I tested the module personally, it broke my cart path when I tried uninstalling it, so test it locally first. You might be able to sponsor some tweaks and a stable release on it, or this may give you some ideas as to how to accomplish it yourself with your own custom code.

Here are some photos of the UI to help you wrap your mind around the function: Hope this helps!

enter image description here enter image description here

@Jdrupal 2019-07-14 09:28:57

From the docs, This module extends Drupal Commerce by allowing the site admin to collect a number of existing products together in a bundle, and offer them at a new bundle price, with a new bundle SKU. Which means that it's possible to group multiple products into one single one with a new price. First of all that's not what OP is asking for, 2nd that module, as you slightly mention, doesn't even have a release for D8 yet, only a dev release.

@TonyTheFerg 2019-07-14 11:00:30

Edited. I disagree with your first of all, and I clarified your second of all. The docs don't give any detail on the minimum and maximum quantities aspect that the D8 dev version allow. I HAVE used the module... The dev version certainly allows you to set minimum quantities to multiple individual products and present them as a bundle for the end user.

@Jdrupal 2019-07-14 11:25:07

Ok, don't know if I made it clear enough. Commerce product bundles, takes e.g. 3 different products and sell them for a fixed price. What OP wants is to make sure that the user buys the other products too if too few products of a specefic type has been brought and not all of them together with a fixed quantity and price. If OP was to use that module he would either need to hack it or contribute to it, which makes it easier to code it. Hope you understand my point.

@TonyTheFerg 2019-07-14 11:31:13

CPB will give you a min/max RANGE, allowing the customer to manipulate that range on multiple products within the bundle. Price is mostly irrelevant as the question made no mention of discount, just bundling via minimum quantity requirements. From what I understand anyway. Not sure my answer deserved a down vote.

@Jdrupal 2019-07-14 11:44:10

Removed the downvote, since you made your answer more clear. Still don't think that the module is applicable here, since it requires the bundle to have a total price, which should be calculated based on quantity and not by a fixed value.

@TonyTheFerg 2019-07-14 11:54:12

Thanks! I added pictures to help wrap your mind around the UI. And also noted the required function. That bundle price is NOT required. The price can simply be generated based on the quantity selected by the end user.

@Jdrupal 2019-07-14 11:57:14

I have installed the module myself to see the UI, I definetely think it can help some of the way, but I don't think that the module is applicable of doing all the logic that OP is talking about, e.g. it shall only allpy if product a's quantity is lower than 100 and the other products must have a minimum total quantity of 100. That would probably be needed to custom code as well.

@Jdrupal 2019-07-14 11:57:38

And it's never a good idea to hack a module or change in its code.

@TonyTheFerg 2019-07-14 11:59:14

He could reach out to Olaf, and sponsor his concept... TTYL!

@TonyTheFerg 2019-07-14 12:08:31

Right, there are limitations as I mentioned. His use case will determine if he can make it work. :)

@Jdrupal 2019-07-14 12:09:40

HAHA, can't expect him to begin contributing to a module!

@MilanG 2019-07-15 08:35:27

Thank you guys, however, I don't think it's an option for me to use this modules since it doesn't have stable release for D8 and since it's not for me personally, but for company I'm working at I'm not willing to take the risk.

@TonyTheFerg 2019-07-15 12:08:54

Right on. Just remember your own custom modules will not be RTBC at all, so those wont be "stable" either. I am actually actively pursuing development on this mod.

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