edit promo is completed

src/main/java/com/nisum/ascend/promotions/controller/PromotionsController.java

@@ -46,11 +46,13 @@ public class PromotionsController {
     }
 
     @PutMapping("/{promoId}")
-    public Mono<ResponseEntity<PromotionDto>> updatePromotionById(@PathVariable String promoId, @RequestBody Promotion newPromotion){
-        //TODO: update promotion
-        return null;
+    public Mono<ResponseEntity<PromotionDto>> updatePromotionById(@PathVariable("promoId") String promoId, @RequestBody Promotion newPromotion){
+        return promotionService.updatePromotion(promoId,newPromotion)
+                .map(updatedProduct -> ResponseEntity.ok(updatedProduct))
+                .defaultIfEmpty(ResponseEntity.badRequest().build());
     }
 
+
     @DeleteMapping("/{promoId}")
     public Mono<ResponseEntity<PromotionDto>> deletePromotionById(@PathVariable String promoId){
         //TODO: delete promotion

src/main/java/com/nisum/ascend/promotions/repository/PromotionRepository.java

@@ -5,8 +5,10 @@ import com.nisum.ascend.promotions.model.Promotion;
 import org.springframework.data.mongodb.repository.ReactiveMongoRepository;
 import org.springframework.stereotype.Repository;
 import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
 
 @Repository
 public interface PromotionRepository extends ReactiveMongoRepository<Promotion, String> {
     Flux<Promotion> findByProductSku(String sku);
+    Mono<Promotion> findByPromotionId(String promoId);
 }

src/main/java/com/nisum/ascend/promotions/service/PromotionService.java

@@ -25,4 +25,14 @@ public class PromotionService {
     public Mono<PromotionDto> createPromotion(Promotion promotion){
         return promotionRepository.save(promotion).map(PromotionDto::generateDtoFromPromotion);
     }
+    public Mono<PromotionDto> updatePromotion(String promoId, Promotion promotion){
+        return promotionRepository.findByPromotionId(promoId)
+                .flatMap(promo ->{
+                    promo.setDiscountPercentage(promotion.getDiscountPercentage());
+                    promo.setProductSku(promotion.getProductSku());
+                    promo.setMinimumQuantity(promotion.getMinimumQuantity());
+                    return promotionRepository.save(promo).map(PromotionDto::generateDtoFromPromotion);
+                });
+    }
+
 }

src/test/java/com/nisum/ascend/promotions/controller/PromotionsControllerTest.java

@@ -99,4 +99,18 @@ class PromotionsControllerTest {
                     promos.forEach(p -> assertEquals(skuWithMultiplePromos, p.getProductSku()));
                 });
     }
+    @Test
+    void editPromotion(){
+        Promotion promotion = new Promotion("0003","1000",(float) .5,1);
+        webTestClient.put()
+                .uri("/api/promos/0003")
+                .contentType(MediaType.valueOf(MediaType.APPLICATION_JSON_VALUE))
+                .accept(MediaType.valueOf(MediaType.APPLICATION_JSON_VALUE))
+                .body(Mono.just(promotion),Promotion.class)
+                .exchange()
+                .expectStatus().isOk()
+                .expectBody()
+                .jsonPath("$.minimumQuantity").isEqualTo(1);
+    }
+
 }
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