Ttdfjt

Requirement: every time a customer place an order, a free shipping coupon will be sent which can only be used once.

So I need to insert the dynamic coupon code just like gift card code and abandoned cart rule coupon on normal email template.

Appreciate for any comment and solution.

Yes,it is possible.

• Create A cart rules from admin>Marketing>Cart Rules.


• Create a rules which will create dynamic coupon by selecting 'Use
  Auto Generation' for create multiple couple coupons.

During Creation setting should be :

Now,Add custom data in order email template in Magento 2 and create a coupon of the rule,you should fire run observer at event email_order_set_template_vars_before.

$this->eventManager->dispatch(
'email_order_set_template_vars_before',
['sender' => $this, 'transport' => $transport]
);

So, at this event you can add new parameter via transport to template means you can create coupon and send to email.

Just like:
events.xml

<?xml version="1.0" encoding="utf-8"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
 <event name="email_order_set_template_vars_before">
 <observer name="add_Custom_variable_to_Order" 
 instance="[Vendor][ModuleName]ObserverObserverforAddCustomVariable" />
 </event>
</config>

And at observer will create coupon and send to to email:

<?php
namespace [Vendor][ModuleName]Observer;
use MagentoFrameworkEventObserverInterface;
use MagentoFrameworkAppRequestDataPersistorInterface;

class ObserverforAddCustomVariable implements ObserverInterface


 protected $ruleFactory;
 protected $massgenerator;
 protected $logger;

 public function __construct(MagentoSalesRuleModelRuleFactory $ruleFactory,MagentoSalesRuleModelCouponMassgenerator $massgenerator, PsrLogLoggerInterface $logger ) 
 $this->ruleFactory= $ruleFactory;
 $this->massgenerator = $massgenerator;
 $this->logger = $logger;
 

 /**
 *
 * @param MagentoFrameworkEventObserver $observer
 * @return void
 */
 public function execute(MagentoFrameworkEventObserver $observer)
 
 /** @var MagentoFrameworkAppActionAction $controller */
 $transport = $observer->getTransport();
 $couponCode = $this->createOneCoupon();
 if($couponCode)
 $transport['free-coupon'] = $couponCode;
 
 
 protected function createOneCoupon()
 
 $ruleModel = $this->ruleFactory->create();
 $ruleModel->load(RulesID);
 try 
 $data = array(
 'rule_id' => 1,
 'qty' => 1,
 'length' => '12',
 'format' => 'alphanum',
 'prefix' => 'free-shipping',
 'suffix' => '',
 'dash'=>0
 );


 $generator = $this->massgenerator;
 if (!$generator->validateData($data)) 
 return false;
 else 
 $generator->setData($data);
 $generator->generatePool();
 $generated = $generator->getGeneratedCount();
 $codes = $generator->getGeneratedCodes();
 return $codes[0];

 
 catch (MagentoFrameworkExceptionLocalizedException $e) 
 $this->logger->critical($e);
 return false;
 catch (Exception $e) 

 $this->logger->critical($e);
 return false;
 
 

At the email template , you can get this custom variables free-coupon using raw.

how to add custom data in order email in magento 2

Working fine.Thanks a lot.Only issue with object manager object.

Just added $objectManager = MagentoFrameworkAppObjectManager::getInstance();

And working fine.

We should not use Object manager to create object.

I did some miner changes in existing code and working fine.
protected $ruleFactory;
protected $massGenerator;

public function __construct(

MagentoSalesRuleModelRuleFactory $ruleFactory,
MagentoSalesRuleModelCouponMassgenerator $massGenerator

 )


$this->rulesFactory = $ruleFactory;
$this->massGenerator = $massGenerator;



public function execute(MagentoFrameworkEventObserver $observer)

 /** @var MagentoFrameworkAppActionAction $controller */
 $transport = $observer->getTransport();
 $couponCode = $this->createOneCoupon();
 if($couponCode)
 $transport['couponcode'] = $couponCode;
 

 


protected function createOneCoupon()


 try 
 $data = array(
 'rule_id' => 4,
 'qty' => 1,
 'length' => '12',
 'format' => 'alphanum',
 'prefix' => '',
 'suffix' => '',
 'dash'=>0
 );


 if (!$this->massGenerator->validateData($data)) 
 return false;
 else 
 $this->massGenerator->setData($data);
 $this->massGenerator->generatePool();
 $generated = $this->massGenerator->getGeneratedCount();
 $codes = $this->massGenerator->getGeneratedCodes();
 return $codes[0];

 
 catch (MagentoFrameworkExceptionLocalizedException $e) 
 $this->_objectManager->get('PsrLogLoggerInterface')->critical($e);
 return false;
 catch (Exception $e) 

 $this->_objectManager->get('PsrLogLoggerInterface')->critical($e);
 return false;