Magento 2: Cart price rule condition programmatically

Question

I have a cart price rule whose id is 5. This rule applied for all customers and no condition applied to this. I want to make a condition on this rule is False when the payment method is paypal_billing_agreement You can see in the screenshot

This condition I make from the admin panel But my requirement changes, now I want to do this by InstallData.php or other way But should be programmatically in my custom module. Because my some other functionality related to these conditions.

Answer 1

According to the best practices in Magento 2 you need to use Repositories to create/save entities. However, there are still some issues with repositories for particular entities, including the SalesRule and that's why I will describe here how to achieve it directly via model (the same way how it's implemented in Magento 2 core).

In your class constructor inject the Rule Factory

protected $ruleFactory

public function __construct(\Magento\SalesRule\Model\RuleFactory $ruleFactory) {
    $this->rulesFactory = $ruleFactory
}

After this, inside of the method, where you are going to create the rule, init the rule data, assign the date to the rule model and save the model:

$ruleData = [
            "name" => "Buy 3 tee shirts and get the 4th free",
            "description" => "Buy 3 tee shirts and get the 4th free",
            "from_date" => null,
            "to_date" => null,
            "uses_per_customer" => "0",
            "is_active" => "1",
            "stop_rules_processing" => "0",
            "is_advanced" => "1",
            "product_ids" => null,
            "sort_order" => "0",
            "simple_action" => "buy_x_get_y",
            "discount_amount" => "1.0000",
            "discount_qty" => null,
            "discount_step" => "3",
            "apply_to_shipping" => "0",
            "times_used" => "0",
            "is_rss" => "1",
            "coupon_type" => "NO_COUPON",
            "use_auto_generation" => "0",
            "uses_per_coupon" => "0",
            "simple_free_shipping" => "0",
            "customer_group_ids" => [0, 1, 2, 3],
            "website_ids" => [1],
            "coupon_code" => null,
            "store_labels" => [],
            "conditions_serialized" => '',
            "actions_serialized" => ''
        ];

$ruleModel = $this->ruleFactory->create();
$ruleModel->setData($ruleData);
$ruleModel->save();

All conditions and actions can be assigned via conditions_serialized and actions_serialized fields. They are empty in this example since they have large values usually. To get the corresponding serialized values for your rule go to admin panel, create a rule with all values you want, save it and check the POST parameters of the save request. You will be able to extract the serialized values from the POST request.