Automatic shopping cart price rule does not apply if coupon code is applied

[pinkdigital]

I am trying to set an automatically generated coupon code to a Magento 2 quote.
I am using is:

        $this->_checkoutSession->getQuote()->setCouponCode($post['coupon_code'])->setTotalsCollectedFlag(false)->collectTotals()->save();

The coupon code is being set in the quote but it is not updating when redirected by to the Magento cart page

[pinkdigital · Accepted solution]

My original code worked with a single coupon code but not with multiple generated codes. I have resolved this by copying the couponPost controller from Magento_Checkout into my module and make the necessary changes.