fix: prevent departments lookup with invalid collegeId (#480)

Treat sentinel -1 college/department as unselected to avoid calling /users/lookup/departments with collegeId=-1 (server VALIDATION_ERROR).

Author: HI-JIN2

app/src/main/java/com/eatssu/android/presentation/mypage/userinfo/UserInfoActivity.kt

@@ -177,7 +177,7 @@ class UserInfoActivity :
         val data = state.data
 
         // 단과대를 먼저 선택하도록 유도
-        if (data.selectedCollege == null) {
+        if (data.selectedCollege == null || data.selectedCollege.collegeId == -1) {
             showToast(R.string.toast_college_required, ToastType.ERROR)
             return
         }
@@ -278,4 +278,4 @@ class UserInfoActivity :
         }
     }
 
-}
+}

app/src/main/java/com/eatssu/android/presentation/mypage/userinfo/UserInfoViewModel.kt

@@ -57,11 +57,14 @@ class UserInfoViewModel @Inject constructor(
 
             val userInfo = getUserCollegeDepartmentUseCase()
 
+            val initialCollege = userInfo.userCollege.takeUnless { it.collegeId == -1 }
+            val initialDepartment = userInfo.userDepartment.takeUnless { it.departmentId == -1 }
+
             // 단과대 목록과 학과 목록을 먼저 모두 가져옴
             val colleges = userRepository.getTotalColleges()
             val departments =
-                if (userInfo.userCollege.collegeId != -1)
-                    userRepository.getTotalDepartments(userInfo.userCollege.collegeId)
+                if (initialCollege != null)
+                    userRepository.getTotalDepartments(initialCollege.collegeId)
                 else
                     emptyList()
 
@@ -71,10 +74,10 @@ class UserInfoViewModel @Inject constructor(
                     UserInfoData(
                         nickname = userInfo.nickname,
                         originalNickname = userInfo.nickname,
-                        selectedCollege = userInfo.userCollege,
-                        originalCollege = userInfo.userCollege,
-                        selectedDepartment = userInfo.userDepartment,
-                        originalDepartment = userInfo.userDepartment,
+                        selectedCollege = initialCollege,
+                        originalCollege = initialCollege,
+                        selectedDepartment = initialDepartment,
+                        originalDepartment = initialDepartment,
                         collegeList = colleges,
                         departmentList = departments
                     )
@@ -187,6 +190,14 @@ class UserInfoViewModel @Inject constructor(
         viewModelScope.launch {
             val currentState = _uiState.value as? UiState.Success ?: return@launch
 
+            if (collegeId == -1) {
+                Timber.w("학과 목록 로드 스킵: invalid collegeId=-1")
+                _uiState.update {
+                    UiState.Success(currentState.data.copy(departmentList = emptyList()))
+                }
+                return@launch
+            }
+
             val departments = userRepository.getTotalDepartments(collegeId)
             _uiState.update {
                 UiState.Success(currentState.data.copy(departmentList = departments))
@@ -305,4 +316,3 @@ data class UserInfoData(
             }
         }
 }
-