Remove Certain Shipping method on estimate and checkout

Question

• I want to remove Some of shipping method on both estimate and checkout page.
• If parameter in quote remove_all to 1 then remove all method which are available and set only one which i have created.
• if remove_all is 0 then remove just my custom shipping method keep which all are available

I think there should be an observer event when all shipping methods are render and i can remove from there.

Answer 1

You can use next plugin for your purpose:

<type name="Magento\Shipping\Model\Rate\Result">
    <plugin name="your_plugin_name_update_rate_result"
            type="Vendor\Module\Plugin\ShippingRateResultAppend"
            sortOrder="10"
            disabled="false" />
</type>

code will be like this one, but with own validation:

/**
 * Disable the marked shipping rates. 
 * 
 * @param \Magento\Shipping\Model\Rate\Result $subject
 * @param array $result
 * @return array
 */
public function afterGetAllRates($subject, $result)
{
    /** @var \Magento\Quote\Model\Quote $quote */
    $quote = $this->getQuote(); // method must be defined in your class; you can get an actual quote from a session;
    if (!$quote) {
        // exception?
    }
    $removeAll                = (int)$quote->getRemoveAll();
    $customShippingMethodCode = 'custom_methodcode'; // static

    /** @var \Magento\Quote\Model\Quote\Address\RateResult\Method[] $result */
    /**
     * @var int $key
     * @var \Magento\Quote\Model\Quote\Address\RateResult\Method $rate
     */
    foreach ($result as $key => $rate) {
        $methodCode = $rate->getCarrier() . '_' . $rate->getMethod();
        if ($removeAll && $methodCode !== $customShippingMethodCode) {
            unset($result[$key]);
        } elseif (!$removeAll && $methodCode === $customShippingMethodCode) {
            unset($result[$key]);
        }
    }

    return $result;
}