3. How are rules checked?

Danger

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Everything related to this subject is located in Sylius\Component\Promotion\Checker.

3.1. Rule checkers

New rules can be created by implementing RuleCheckerInterface. This interface provides the method isEligible which aims to determine if the promotion subject respects the current rule or not.

I told you before that SyliusPromotionBundle ships with 2 types of rules : cart quantity rule and item total rule.

Cart quantity rule is defined via the service sylius.promotion_rule_checker.cart_quantity which uses the class CartQuantityRuleChecker. The method isEligible checks here if the promotion subject has the minimum quantity (method getPromotionSubjectItemCount() of PromotionSubjectInterface) required by the rule.

Item total rule is defined via the service sylius.promotion_rule_checker.item_total which uses the class ItemTotalRuleChecker. The method isEligible checks here if the promotion subject has the minimum amount (method getPromotionSubjectItemTotal() of PromotionSubjectInterface) required by the rule.

3.2. The promotion eligibility checker service

To be eligible to a promotion, a subject must :

1. respect all the rules related to the promotion
2. respect promotion dates if promotion is limited by time
3. respect promotions usages count if promotion has a limited number of usages
4. if a coupon is provided with this order, it must be valid and belong to this promotion

The service sylius.promotion_eligibility_checker checks all these constraints for you with the method isEligible() which returns true or false. This service uses the class CompositePromotionEligibilityChecker.