Uncaught Error: Cannot instantiate interface

在新建 May\Applet\Api\SashareInterface 介面，去實現salogin 方法，用 postman 呼叫介面時報錯，報錯內容如下：

"Fatal Error: 'Uncaught Error: Cannot instantiate interface May\\Applet\\Api\\SashareInterface in \/Users\/project\/practise\/mayMagento2.3\/vendor\/magento\/framework\/ObjectManager\/Factory\/AbstractFactory.php:116\nStack trace:\n#0 \/Users\/project\/practise\/mayMagento2.3\/vendor\/magento\/framework\/ObjectManager\/Factory\/Compiled.php(108): Magento\\Framework\\ObjectManager\\Factory\\AbstractFactory->createObject('May\\\\Applet\\\\Api\\\\...', Array)\n#1 \/Users\/project\/practise\/mayMagento2.3\/vendor\/magento\/framework\/ObjectManager\/ObjectManager.php(70): Magento\\Framework\\ObjectManager\\Factory\\Compiled->create('May\\\\Applet\\\\Api\\\\...')\n#2 \/Users\/project\/practise\/mayMagento2.3\/vendor\/magento\/module-webapi\/Controller\/Rest\/SynchronousRequestProcessor.php(90): Magento\\Framework\\ObjectManager\\ObjectManager->get('May\\\\Applet\\\\Api\\\\...')\n#3 \/Users\/project\/practise\/mayMagento2.3\/vendor\/magento\/module-webapi\/Controller\/Rest.php(188): Magento\\Webapi\\Controller\\Rest\\SynchronousRequestProcessor->process(Object(Magento\\Framework\\Webapi\\Rest\\Request\\Proxy))\n#4 \/Users\/pr' in '\/Users\/project\/practise\/mayMagento2.3\/vendor\/magento\/framework\/ObjectManager\/Factory\/AbstractFactory.php' on line 116"

經過資料排查，發現忘了新增 di.xml 檔案，現新增檔案，內容如下：

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <!-- Sashare -->
    <preference for="May\Applet\Api\SashareInterface" type="May\Applet\Model\Api\Sashare"/>
</config>

執行下面命令：

- 清除 generated
- 清除 var/cache
- php bin/magento cache:clean  清空快取 
- php bin/magento cache:flush  重新整理快取
- php bin/magento setup:di:compile 生成自動類檔案 

執行上述命令，介面請求正常!

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