Career의 endDate를 nullable로 변경 (#60)

* endDate를 nullable로 변경하고 null일경우 임의의값을 넣도록하였습니다.

* LocalDate null 대체 값을 util로 관리

* 패키지 이동

* 전역 상수 네이밍 변경

src/main/kotlin/team/themoment/gsmNetworking/common/util/DateValueUtil.kt

@@ -0,0 +1,10 @@
+package team.themoment.gsmNetworking.common.util
+
+import java.time.LocalDate
+
+class DateValueUtil {
+
+    companion object{
+        val VALUE_TO_REPLACE_NULL = LocalDate.of(9999, 12, 31)!!
+    }
+}

src/main/kotlin/team/themoment/gsmNetworking/domain/mentor/domain/Career.kt

@@ -30,7 +30,7 @@ class Career(
     @Column(nullable = false)
     val startDate: LocalDate,
 
-    @Column(nullable = false)
+    @Column(nullable = true)
     val endDate: LocalDate,
 
     @Column(nullable = false)

src/main/kotlin/team/themoment/gsmNetworking/domain/mentor/dto/MentorCareerDto.kt

@@ -15,8 +15,7 @@ data class MentorCareerDto(
     @field:NotBlank
     val startDate: LocalDate,
 
-    @field:NotBlank
-    val endDate: LocalDate,
+    val endDate: LocalDate?,
 
     val isWorking: Boolean?
 )

src/main/kotlin/team/themoment/gsmNetworking/domain/mentor/service/MentorRegistrationService.kt

@@ -9,6 +9,7 @@ import team.themoment.gsmNetworking.domain.user.dto.UserRegistrationDto
 import team.themoment.gsmNetworking.domain.user.service.UserRegistrationService
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
+import team.themoment.gsmNetworking.common.util.DateValueUtil
 
 /**
  * 멘토를 저장하는 로직이 담긴 서비스 클래스 입니다.
@@ -43,7 +44,7 @@ class MentorRegistrationService(
                 companyUrl = it.companyUrl ?: "",
                 position = it.position,
                 startDate = it.startDate,
-                endDate = it.endDate,
+                endDate = it.endDate ?: DateValueUtil.VALUE_TO_REPLACE_NULL,
                 isWorking = it.isWorking ?: false
             )
         }