Decouple transmission from the shipment's shipping method (#3613434) · Issues · project / commerce_mrw

Decouple transmission from the shipment's shipping method

>>> [!note] Migrated issue   Reported by: [introfini](https://www.drupal.org/user/42293) Related to !2 >>> <h3>Problem/Motivation</h3> The transmit, cancel and label flows are all hard-coupled to the shipment's own shipping method. <code>MrwTransmitForm</code>, <code>MrwCancelForm</code> and <code>MrwLabelController</code> return a 404 unless <code>$shipment->getShippingMethod()->getPlugin()->getPluginId() === 'mrw'</code>, and the submit handlers read both the SAGEC credentials and the service code from that same plugin instance. This conflates two different concerns: <ul> <li>What the customer bought at checkout - the shipping method entity carries the customer-facing label, the rate the customer paid and the checkout visibility conditions.</li> <li>Which MRW account/service executes the shipment - credentials and service code, an operator decision made at fulfilment time.</li> </ul> Because they are coupled, a store whose customer-facing method is not an <code>mrw</code> method (for example a flat-rate "Free shipping" method, or a store that offers several MRW services but only exposes one at checkout) can only transmit by editing the shipment and swapping its shipping method in the back office. That mutates the commercial data the customer saw (label, amount) and forces stores to maintain duplicate "back-office only" shipping methods whose sole purpose is selecting a different MRW service code. The wider ecosystem treats the carrier as a fulfilment-time decision: <a href="https://www.drupal.org/project/commerce_shipping_carrier">Commerce Shipping Carrier</a> models carriers as configuration entities selected on the shipment; ShipStation/Sendcloud integrations delegate carrier choice to the external platform at shipping time; Commerce EasyPost lets the operator pick the rate/service when buying the label; Shopify's fulfilment UI selects the shipping carrier independently of the checkout shipping line. <h4>Steps to reproduce</h4> <ol> <li>Configure a flat-rate shipping method (e.g. "Free shipping") shown to customers at checkout, plus an MRW shipping method with valid SAGEC credentials.</li> <li>Place an order that selects the flat-rate method and create its shipment.</li> <li>Try to transmit the shipment to MRW: the transmit route returns 404. The only workaround is changing the shipment's shipping method to the MRW method, losing the commercial data the customer saw at checkout.</li> </ol> <h3>Proposed resolution</h3> <ul> <li>"Transmit as" select on <code>MrwTransmitForm</code>, listing the enabled shipping methods whose plugin is <code>mrw</code>. Default: the shipment's own method when it is an <code>mrw</code> method (current behaviour, no extra clicks), otherwise the first eligible method. Credentials and service code are read from the selected method instead of the shipment's method.</li> <li>Record the executing method on the shipment via the <code>data</code> property (<code>$shipment->setData('mrw_fulfilment_method', $method->id())</code>) when transmitting. No new fields are imposed on adopting sites.</li> <li>Cancel and label resolve the plugin from that record, falling back to <code>$shipment->getShippingMethod()</code> for shipments transmitted before this change. This is required for correctness, not cosmetics: cancelling or fetching the label of a shipment transmitted under another method must use the credentials that created it.</li> <li>Eligibility settings: a module setting listing non-mrw shipping methods whose shipments expose the transmit action, so the button does not appear on shipments that will never travel with MRW (e.g. international shipments handled by another carrier). Methods using the <code>mrw</code> plugin are always eligible.</li> </ul> Shared resolution helper used by <code>MrwCancelForm</code> and <code>MrwLabelController</code>: <div class="codeblock"> <pre><?php private function resolveFulfilmentMethod(ShipmentInterface $shipment): ?ShippingMethodInterface {   $method_id = $shipment->getData('mrw_fulfilment_method');   $method = $method_id     ? $this->entityTypeManager->getStorage('commerce_shipping_method')->load($method_id)     : $shipment->getShippingMethod();   if ($method === NULL || $method->getPlugin()->getPluginId() !== 'mrw') {     return NULL;   }   return $method; } ?></pre></div> Transmit submit reads the selected method instead of the shipment's: <div class="codeblock"> <pre><?php $method = $this->entityTypeManager->getStorage('commerce_shipping_method')   ->load($form_state->getValue('fulfilment_method')); /** @var \Drupal\commerce_mrw\Plugin\Commerce\ShippingMethod\Mrw $plugin */ $plugin = $method->getPlugin(); $request = $this->requestBuilder->build($this->shipment, $plugin->getServiceCode()); $response = $this->sagecClient->transmEnvio($plugin->getCredentials(), $request); $this->shipment->setTrackingCode($response->numeroEnvio); $this->shipment->setData('mrw_fulfilment_method', $method->id()); $this->shipment->save(); ?></pre></div> The form gate changes from "the shipment's method is <code>mrw</code>" to "at least one enabled <code>mrw</code> method exists and the shipment's method is eligible". Backwards compatible: existing shipments keep working through the fallback, and the default select value reproduces today's behaviour for shipments whose method already is an <code>mrw</code> method. <h3>Remaining tasks</h3> <ul> <li>Agree on the approach.</li> <li>MR against 1.0.x with kernel test coverage for the resolution fallback.</li> </ul> <h3>API changes</h3> None expected. New optional setting and a new <code>data</code> key on shipments; existing behaviour is preserved by defaults.

issue

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