A working implementation of stock management for product bundles
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
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Reported by: [johnodonnell@mac.com](https://www.drupal.org/user/507154)
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>In order for <a href="https://drupal.org/project/commerce_product_bundle">Commerce product bundle</a> to work with commerce stock we will need to be able to check and update the stock level of the product associated with product bundle instead of the product bundle itself that should have no stock level of its own. </p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>While a solution is currently in debate read comments, the following are things we know:</p>
<p>The following are the three Stock validation rules and their conditions should be updated:</p>
<p><strong>Stock: disable add to cart</strong><br>
<em>commerce-product:commerce-stock is NOT greater then 0</em></p>
<p><strong>Stock: validate add to cart</strong><br>
<em>stock-requested-total is greater then commerce-product:commerce-stock</em></p>
<p><strong>Stock: validate checkout<br>
</strong><em>stock-already-ordered is greater then commerce-product:commerce-stock</em></p>
<p>and we also need to handle the stock control rule<br>
<strong>Decrease when completing the order process</strong></p>
<p><strong>Other impotent notes:</strong></p>
<ul>
<li>commerce_stock_check_cart_product_level() is used to calculate the stock level already in the basket and any calculation rules will need to take this into account. Note that a product can belong to multiple bundles (or so I believe). see <a href="https://drupal.org/comment/8385283#comment-8385283">#8</a> & <a href="https://drupal.org/comment/8444499#comment-8444499">#15</a> for more details.</li>
</ul>
<h3 id="summary-original-report">Original report by [Critical Mash]</h3>
<p>I needed an immediate solution to managing stock levels for products in a bundle, so I did this quick hack to get it working. I thought someone else might have a similar need before bundle support can be added to commerce_stock (see roadmap <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/commerce_stock/-/work_items/1269168" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/commerce_stock/-/work_items/1269168</a></span> and these issues: <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/commerce_stock/-/work_items/1220360" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/commerce_stock/-/work_items/1220360</a></span> and <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/commerce_stock/-/work_items/1220906" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/commerce_stock/-/work_items/1220906</a></span>). What I did was add a custom action that could be used by the checkout rule "Decrease stock when completing the order process".</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #FF8000">/**<br> * Rules to handle stock adjustments on session bundles<br> */<br></span><span style="color: #007700">function </span><span style="color: #0000BB">MY_MODULE_rules_action_info</span><span style="color: #007700">() {<br> </span><span style="color: #0000BB">$actions </span><span style="color: #007700">= array();<br> <br> </span><span style="color: #0000BB">$actions</span><span style="color: #007700">[</span><span style="color: #DD0000">'MY_MODULE_decrease_by_line_item'</span><span style="color: #007700">] = array(<br> </span><span style="color: #DD0000">'label' </span><span style="color: #007700">=> </span><span style="color: #0000BB">t</span><span style="color: #007700">(</span><span style="color: #DD0000">'Decrease the stock level for all referenced products that apply, given a line item'</span><span style="color: #007700">),<br> </span><span style="color: #DD0000">'group' </span><span style="color: #007700">=> </span><span style="color: #0000BB">t</span><span style="color: #007700">(</span><span style="color: #DD0000">'Commerce Stock'</span><span style="color: #007700">),<br> </span><span style="color: #DD0000">'parameter' </span><span style="color: #007700">=> array(<br> </span><span style="color: #DD0000">'commerce_line_item' </span><span style="color: #007700">=> array(<br> </span><span style="color: #DD0000">'type' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'commerce_line_item'</span><span style="color: #007700">,<br> </span><span style="color: #DD0000">'label' </span><span style="color: #007700">=> </span><span style="color: #0000BB">t</span><span style="color: #007700">(</span><span style="color: #DD0000">'Line item'</span><span style="color: #007700">)<br> ),<br> ),<br> );<br> <br> return </span><span style="color: #0000BB">$actions</span><span style="color: #007700">;<br>}<br><br></span><span style="color: #FF8000">/**<br> * Altered version of commerce_stock_decrease_by_line_item() to find referenced products<br> *<br> * @param $line_item<br> * A line item object.<br> */<br></span><span style="color: #007700">function </span><span style="color: #0000BB">MY_MODULEr_decrease_by_line_item</span><span style="color: #007700">(</span><span style="color: #0000BB">$line_item</span><span style="color: #007700">) {<br> </span><span style="color: #FF8000">// load commerce_stock.rules.inc to get commerce_stock_adjust()<br> </span><span style="color: #0000BB">module_load_include</span><span style="color: #007700">(</span><span style="color: #DD0000">'inc'</span><span style="color: #007700">, </span><span style="color: #DD0000">'commerce_stock'</span><span style="color: #007700">, </span><span style="color: #DD0000">'commerce_stock.rules'</span><span style="color: #007700">);<br> if (</span><span style="color: #0000BB">$line_item</span><span style="color: #007700">-></span><span style="color: #0000BB">type </span><span style="color: #007700">== </span><span style="color: #DD0000">'product'</span><span style="color: #007700">) {<br> </span><span style="color: #FF8000">// The product SKU that will have its stock level adjusted.<br> </span><span style="color: #0000BB">$sku </span><span style="color: #007700">= </span><span style="color: #0000BB">$line_item</span><span style="color: #007700">-></span><span style="color: #0000BB">line_item_label</span><span style="color: #007700">;<br> </span><span style="color: #0000BB">$product </span><span style="color: #007700">= </span><span style="color: #0000BB">commerce_product_load_by_sku</span><span style="color: #007700">(</span><span style="color: #0000BB">$sku</span><span style="color: #007700">);<br> </span><span style="color: #FF8000">// check product for our reference fields then check each product<br> // field_bundle_sessions is the name of my product Reference field, you'll need to edit this to match your Product Bundle type<br> </span><span style="color: #007700">if(isset (</span><span style="color: #0000BB">$product</span><span style="color: #007700">-></span><span style="color: #0000BB">field_bundle_sessions</span><span style="color: #007700">)) {<br> foreach (</span><span style="color: #0000BB">$product</span><span style="color: #007700">-></span><span style="color: #0000BB">field_bundle_sessions</span><span style="color: #007700">[</span><span style="color: #DD0000">'und'</span><span style="color: #007700">] as </span><span style="color: #0000BB">$productArray</span><span style="color: #007700">) {<br> </span><span style="color: #FF8000">// load the reference product<br> </span><span style="color: #0000BB">$refProduct </span><span style="color: #007700">= </span><span style="color: #0000BB">commerce_product_load</span><span style="color: #007700">(</span><span style="color: #0000BB">$productArray</span><span style="color: #007700">[</span><span style="color: #DD0000">'product_id'</span><span style="color: #007700">]);<br> </span><span style="color: #FF8000">// after this, it works just the same as commerce_stock_decrease_by_line_item() <br> </span><span style="color: #007700">if (</span><span style="color: #0000BB">commerce_stock_product_type_enabled</span><span style="color: #007700">(</span><span style="color: #0000BB">$refProduct</span><span style="color: #007700">-></span><span style="color: #0000BB">type</span><span style="color: #007700">)) {<br> if (!(</span><span style="color: #0000BB">commerce_stock_product_type_override_enabled</span><span style="color: #007700">(</span><span style="color: #0000BB">$refProduct</span><span style="color: #007700">-></span><span style="color: #0000BB">type</span><span style="color: #007700">) && </span><span style="color: #0000BB">$refProduct</span><span style="color: #007700">-></span><span style="color: #0000BB">commerce_stock_override</span><span style="color: #007700">[</span><span style="color: #DD0000">'und'</span><span style="color: #007700">][</span><span style="color: #0000BB">0</span><span style="color: #007700">][</span><span style="color: #DD0000">'value'</span><span style="color: #007700">] == </span><span style="color: #0000BB">1</span><span style="color: #007700">)) {<br> </span><span style="color: #0000BB">$qty </span><span style="color: #007700">= (int) </span><span style="color: #0000BB">$line_item</span><span style="color: #007700">-></span><span style="color: #0000BB">quantity</span><span style="color: #007700">;<br> </span><span style="color: #FF8000">// Subtract the sold amount from the available stock level.<br> </span><span style="color: #0000BB">commerce_stock_adjust</span><span style="color: #007700">(</span><span style="color: #0000BB">$refProduct</span><span style="color: #007700">, -</span><span style="color: #0000BB">$qty</span><span style="color: #007700">);<br> </span><span style="color: #FF8000">//drupal_set_message("Decrementing stock value for product: ".$refProduct->title);<br> </span><span style="color: #007700">}<br> }<br> } </span><span style="color: #FF8000">// end foreach<br> </span><span style="color: #007700">}<br> }<br>}<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>After this, I just edited the rule <em>Decrease stock when completing the order process</em> and added my new action to the action loop after <em>Decrease the product stock level, given a line item</em>.</p>
<p>So it's a little bit of a hack. A more permanent solution would likely involve checking the product type for any references to other products using a function similar to commerce_stock_product_type_enabled(). But I think it's a good proof of concept.</p>
issue
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