[BE] BillActionDetail 초기화시 totalPrice와 정합성 안맞는 버그 수정

server/src/main/java/server/haengdong/application/BillActionDetailService.java

@@ -9,7 +9,6 @@
 import server.haengdong.application.response.BillActionDetailsAppResponse;
 import server.haengdong.domain.action.BillAction;
 import server.haengdong.domain.action.BillActionDetail;
-import server.haengdong.domain.action.BillActionDetailRepository;
 import server.haengdong.domain.action.BillActionRepository;
 import server.haengdong.domain.event.Event;
 import server.haengdong.exception.HaengdongErrorCode;
@@ -20,16 +19,14 @@
 @Service
 public class BillActionDetailService {
 
-    private final BillActionDetailRepository billActionDetailRepository;
     private final BillActionRepository billActionRepository;
 
     public BillActionDetailsAppResponse findBillActionDetails(String token, Long actionId) {
         BillAction billAction = billActionRepository.findByAction_Id(actionId)
                 .orElseThrow(() -> new HaengdongException(HaengdongErrorCode.BILL_ACTION_NOT_FOUND));
         validateToken(token, billAction);
 
-        List<BillActionDetail> billActionDetails = billActionDetailRepository.findAllByBillAction(billAction);
-
+        List<BillActionDetail> billActionDetails = billAction.getBillActionDetails();
         return BillActionDetailsAppResponse.of(billActionDetails);
     }
 
@@ -43,7 +40,7 @@ public void updateBillActionDetails(String token, Long actionId, BillActionDetai
         validateToken(token, billAction);
         validateTotalPrice(billActionDetailUpdateAppRequests, billAction);
 
-        List<BillActionDetail> billActionDetails = billActionDetailRepository.findAllByBillAction(billAction);
+        List<BillActionDetail> billActionDetails = billAction.getBillActionDetails();
 
         for (BillActionDetailUpdateAppRequest updateRequest : billActionDetailUpdateAppRequests) {
             BillActionDetail detailToUpdate = billActionDetails.stream()

server/src/main/java/server/haengdong/application/BillActionService.java

@@ -9,8 +9,6 @@
 import server.haengdong.domain.action.Action;
 import server.haengdong.domain.action.ActionRepository;
 import server.haengdong.domain.action.BillAction;
-import server.haengdong.domain.action.BillActionDetail;
-import server.haengdong.domain.action.BillActionDetailRepository;
 import server.haengdong.domain.action.BillActionRepository;
 import server.haengdong.domain.action.CurrentMembers;
 import server.haengdong.domain.action.MemberAction;
@@ -26,7 +24,6 @@
 public class BillActionService {
 
     private final BillActionRepository billActionRepository;
-    private final BillActionDetailRepository billActionDetailRepository;
     private final MemberActionRepository memberActionRepository;
     private final ActionRepository actionRepository;
     private final EventRepository eventRepository;
@@ -39,12 +36,9 @@ public void saveAllBillAction(String eventToken, List<BillActionAppRequest> requ
         CurrentMembers currentMembers = CurrentMembers.of(findMemberActions);
 
         for (BillActionAppRequest request : requests) {
-            BillAction billAction = request.toBillAction(action);
+            BillAction billAction = request.toBillAction(action, currentMembers);
             billActionRepository.save(billAction);
             action = action.next();
-            if (currentMembers.isNotEmpty()) {
-                saveBillActionDetails(billAction, currentMembers);
-            }
         }
     }
 
@@ -54,58 +48,33 @@ private Action createStartAction(Event event) {
                 .orElse(Action.createFirst(event));
     }
 
-    private void saveBillActionDetails(BillAction billAction, CurrentMembers currentMembers) {
-        long pricePerMember = billAction.getPrice() / currentMembers.size();
-        currentMembers.getMembers().stream()
-                .map(memberName -> new BillActionDetail(billAction, memberName, pricePerMember, false))
-                .forEach(billActionDetailRepository::save);
-    }
-
     @Transactional
     public void updateBillAction(String token, Long actionId, BillActionUpdateAppRequest request) {
         BillAction billAction = billActionRepository.findByAction_Id(actionId)
                 .orElseThrow(() -> new HaengdongException(HaengdongErrorCode.BILL_ACTION_NOT_FOUND));
 
         validateToken(token, billAction);
 
-        resetBillActionDetail(billAction, request.price());
-
         billAction.update(request.title(), request.price());
     }
 
-    private void resetBillActionDetail(BillAction billAction, Long updatePrice) {
-        if (!billAction.getPrice().equals(updatePrice)) {
-            List<BillActionDetail> billActionDetails = billActionDetailRepository.findAllByBillAction(billAction);
-            int memberCount = billActionDetails.size();
-            if (memberCount != 0) {
-                Long eachPrice = updatePrice / memberCount;
-                billActionDetails.forEach(billActionDetail -> {
-                            billActionDetail.updatePrice(eachPrice);
-                            billActionDetail.updateIsFixed(false);
-                        }
-                );
-            }
-        }
-    }
-
     private void validateToken(String token, BillAction billAction) {
         Event event = billAction.getEvent();
         if (event.isTokenMismatch(token)) {
             throw new HaengdongException(HaengdongErrorCode.BILL_ACTION_NOT_FOUND);
         }
     }
 
-    private Event getEvent(String eventToken) {
-        return eventRepository.findByToken(eventToken)
-                .orElseThrow(() -> new HaengdongException(HaengdongErrorCode.EVENT_NOT_FOUND));
-    }
-
     @Transactional
     public void deleteBillAction(String token, Long actionId) {
         Event event = eventRepository.findByToken(token)
                 .orElseThrow(() -> new HaengdongException(HaengdongErrorCode.EVENT_NOT_FOUND));
 
-        billActionDetailRepository.deleteByBillAction_Action_EventAndBillAction_ActionId(event, actionId);
         billActionRepository.deleteByAction_EventAndActionId(event, actionId);
     }
+
+    private Event getEvent(String eventToken) {
+        return eventRepository.findByToken(eventToken)
+                .orElseThrow(() -> new HaengdongException(HaengdongErrorCode.EVENT_NOT_FOUND));
+    }
 }

server/src/main/java/server/haengdong/application/MemberActionService.java

@@ -1,8 +1,6 @@
 package server.haengdong.application;
 
 import java.util.List;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -11,8 +9,6 @@
 import server.haengdong.domain.action.Action;
 import server.haengdong.domain.action.ActionRepository;
 import server.haengdong.domain.action.BillAction;
-import server.haengdong.domain.action.BillActionDetail;
-import server.haengdong.domain.action.BillActionDetailRepository;
 import server.haengdong.domain.action.BillActionRepository;
 import server.haengdong.domain.action.CurrentMembers;
 import server.haengdong.domain.action.MemberAction;
@@ -31,7 +27,6 @@ public class MemberActionService {
     private final MemberActionRepository memberActionRepository;
     private final EventRepository eventRepository;
     private final ActionRepository actionRepository;
-    private final BillActionDetailRepository billActionDetailRepository;
     private final BillActionRepository billActionRepository;
 
     @Transactional
@@ -100,37 +95,6 @@ private void resetBillAction(Event event, BillAction billAction) {
                 billAction.getSequence());
         CurrentMembers currentMembers = CurrentMembers.of(memberActions);
 
-        billActionDetailRepository.deleteAllByBillAction(billAction);
-
-        if (currentMembers.isNotEmpty()) {
-            Long price = billAction.getPrice();
-            int currentMemberCount = currentMembers.size();
-            long eachPrice = price / currentMemberCount;
-            long remainder = price % currentMemberCount;
-            List<BillActionDetail> billActionDetails = getBillActionDetails(
-                    billAction,
-                    currentMembers,
-                    eachPrice,
-                    remainder
-            );
-            billActionDetailRepository.saveAll(billActionDetails);
-        }
-    }
-
-    private List<BillActionDetail> getBillActionDetails(
-            BillAction billAction,
-            CurrentMembers currentMembers,
-            long eachPrice,
-            long remainder
-    ) {
-        List<String> members = currentMembers.getMembers().stream().toList();
-        List<BillActionDetail> billActionDetails = IntStream.range(0, members.size() - 1)
-                .mapToObj(index -> new BillActionDetail(billAction, members.get(index), eachPrice, false))
-                .collect(Collectors.toList());
-        BillActionDetail lastBillActionDetail = new BillActionDetail(billAction, members.get(members.size() - 1),
-                eachPrice + remainder, false);
-        billActionDetails.add(lastBillActionDetail);
-
-        return billActionDetails;
+        billAction.resetBillActionDetails(currentMembers);
     }
 }

server/src/main/java/server/haengdong/application/request/BillActionAppRequest.java

@@ -2,13 +2,14 @@
 
 import server.haengdong.domain.action.Action;
 import server.haengdong.domain.action.BillAction;
+import server.haengdong.domain.action.CurrentMembers;
 
 public record BillActionAppRequest(
         String title,
         Long price
 ) {
 
-    public BillAction toBillAction(Action action) {
-        return new BillAction(action, title, price);
+    public BillAction toBillAction(Action action, CurrentMembers currentMembers) {
+        return BillAction.create(action, title, price, currentMembers);
     }
 }

server/src/main/java/server/haengdong/domain/action/BillAction.java

@@ -10,7 +10,10 @@
 import jakarta.persistence.OneToMany;
 import jakarta.persistence.OneToOne;
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -45,13 +48,8 @@ public class BillAction implements Comparable<BillAction> {
     private List<BillActionDetail> billActionDetails = new ArrayList<>();
 
     public BillAction(Action action, String title, Long price) {
-        this(null, action, title, price);
-    }
-
-    private BillAction(Long id, Action action, String title, Long price) {
         validateTitle(title);
         validatePrice(price);
-        this.id = id;
         this.action = action;
         this.title = title.trim();
         this.price = price;
@@ -70,23 +68,69 @@ private void validatePrice(Long price) {
         }
     }
 
+    public static BillAction create(Action action, String title, Long price, CurrentMembers currentMembers) {
+        BillAction billAction = new BillAction(action, title, price);
+        billAction.resetBillActionDetails(currentMembers);
+        return billAction;
+    }
+
+    public void resetBillActionDetails(CurrentMembers currentMembers) {
+        this.billActionDetails.clear();
+        Iterator<Long> priceIterator = distributePrice(currentMembers.size()).iterator();
+
+        for (String member : currentMembers.getMembers()) {
+            BillActionDetail billActionDetail = new BillActionDetail(this, member, priceIterator.next(), false);
+            this.billActionDetails.add(billActionDetail);
+        }
+    }
+
+    private void resetBillActionDetails() {
+        Iterator<Long> priceIterator = distributePrice(billActionDetails.size()).iterator();
+
+        billActionDetails.forEach(billActionDetail -> {
+            billActionDetail.updatePrice(priceIterator.next());
+            billActionDetail.updateIsFixed(false);
+        });
+    }
+
+    private List<Long> distributePrice(int memberCount) {
+        if (memberCount == 0) {
+            return new ArrayList<>();
+        }
+        long eachPrice = price / memberCount;
+        long remainder = price % memberCount;
+
+        List<Long> results = Stream.generate(() -> eachPrice)
+                .limit(memberCount - 1)
+                .collect(Collectors.toList());
+        results.add(eachPrice + remainder);
+        return results;
+    }
+
     public void update(String title, Long price) {
         validateTitle(title);
         validatePrice(price);
-        this.title = title;
+        this.title = title.trim();
         this.price = price;
+        resetBillActionDetails();
     }
 
-    public boolean isSamePrice(Long price) {
-        return this.price.equals(price);
+    public void addDetails(List<BillActionDetail> billActionDetails) {
+        billActionDetails.forEach(this::addDetail);
     }
 
-    public Long getSequence() {
-        return action.getSequence();
+    private void addDetail(BillActionDetail billActionDetail) {
+        this.billActionDetails.add(billActionDetail);
+        billActionDetail.setBillAction(this);
     }
 
-    public Event getEvent() {
-        return action.getEvent();
+    public boolean isFixed() {
+        return billActionDetails.stream()
+                .anyMatch(BillActionDetail::isFixed);
+    }
+
+    public boolean isSamePrice(Long price) {
+        return this.price.equals(price);
     }
 
     public Long findPriceByMemberName(String memberName) {
@@ -97,20 +141,12 @@ public Long findPriceByMemberName(String memberName) {
                 .orElse(DEFAULT_PRICE);
     }
 
-    public boolean isFixed() {
-        return billActionDetails.stream()
-                .map(BillActionDetail::getPrice)
-                .distinct()
-                .count() != 1L;
-    }
-
-    public void addDetails(List<BillActionDetail> billActionDetails) {
-        billActionDetails.forEach(this::addDetail);
+    public Long getSequence() {
+        return action.getSequence();
     }
 
-    private void addDetail(BillActionDetail billActionDetail) {
-        this.billActionDetails.add(billActionDetail);
-        billActionDetail.setBillAction(this);
+    public Event getEvent() {
+        return action.getEvent();
     }
 
     @Override

server/src/main/java/server/haengdong/domain/action/BillActionDetailRepository.java

@@ -4,7 +4,6 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
-import server.haengdong.domain.event.Event;
 
 @Repository
 public interface BillActionDetailRepository extends JpaRepository<BillActionDetail, Long> {
@@ -15,8 +14,4 @@ public interface BillActionDetailRepository extends JpaRepository<BillActionDeta
             where bd.billAction = :billAction
             """)
     List<BillActionDetail> findAllByBillAction(BillAction billAction);
-
-    void deleteAllByBillAction(BillAction billAction);
-
-    void deleteByBillAction_Action_EventAndBillAction_ActionId(Event event, Long actionId);
 }