From a2653e0da71d7f4502c9893e3333982afddd5cb4 Mon Sep 17 00:00:00 2001
From: JackWillov <popovuch02@gmail.com>
Date: Fri, 10 Jul 2026 02:48:46 +0200
Subject: [PATCH] mappers implement

---
 .../academy/mapstruct/mapper/GroupMapper.java |  2 +
 .../mapstruct/mapper/StudentMapper.java       | 45 +++++++++++++++++++
 .../mapstruct/mapper/SubjectMapper.java       |  2 +
 3 files changed, 49 insertions(+)

diff --git a/src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java b/src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java
index d60c9df5..dfed37da 100644
--- a/src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java
+++ b/src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java
@@ -3,7 +3,9 @@
 import mate.academy.mapstruct.dto.group.CreateGroupRequestDto;
 import mate.academy.mapstruct.dto.group.GroupDto;
 import mate.academy.mapstruct.model.Group;
+import org.mapstruct.Mapper;
 
+@Mapper(componentModel = "spring")
 public interface GroupMapper {
     GroupDto toDto(Group group);
 
diff --git a/src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java b/src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java
index 853e6b19..49feff10 100644
--- a/src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java
+++ b/src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java
@@ -1,14 +1,59 @@
 package mate.academy.mapstruct.mapper;
 
+import java.util.List;
+import java.util.Optional;
 import mate.academy.mapstruct.dto.student.CreateStudentRequestDto;
 import mate.academy.mapstruct.dto.student.StudentDto;
 import mate.academy.mapstruct.dto.student.StudentWithoutSubjectsDto;
+import mate.academy.mapstruct.model.Group;
 import mate.academy.mapstruct.model.Student;
+import mate.academy.mapstruct.model.Subject;
+import org.mapstruct.AfterMapping;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.MappingTarget;
+import org.mapstruct.Named;
 
+@Mapper(componentModel = "spring")
 public interface StudentMapper {
+
+    @Mapping(source = "group.id", target = "groupId")
+    @Mapping(target = "subjectIds", ignore = true)
     StudentDto toDto(Student student);
 
+    @AfterMapping
+    default void setSubjects(@MappingTarget StudentDto studentDto, Student student) {
+        List<Long> subjectIds = student.getSubjects().stream()
+                .map(Subject::getId)
+                .toList();
+        studentDto.setSubjectIds(subjectIds);
+    }
+
+    @Mapping(source = "group.id", target = "groupId")
     StudentWithoutSubjectsDto toStudentWithoutSubjectsDto(Student student);
 
+    @Mapping(source = "groupId", target = "group", qualifiedByName = "groupById")
+    @Mapping(source = "subjects", target = "subjects", qualifiedByName = "subjectsById")
     Student toModel(CreateStudentRequestDto requestDto);
+
+    @Named("groupById")
+    default Group groupById(Long id) {
+        return Optional.ofNullable(id)
+                .map(Group::new)
+                .orElse(null);
+    }
+
+    @Named("subjectsById")
+    default List<Subject> subjectsById(List<Long> ids) {
+        return Optional.ofNullable(ids)
+                .map(idList -> idList.stream()
+                        .map(id -> {
+                            Subject subject = new Subject();
+                            subject.setId(id);
+                            return subject;
+                        })
+                        .toList())
+                .orElse(null);
+    }
+
 }
diff --git a/src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java b/src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java
index 2906e78e..3adb9d88 100644
--- a/src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java
+++ b/src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java
@@ -3,7 +3,9 @@
 import mate.academy.mapstruct.dto.subject.CreateSubjectRequestDto;
 import mate.academy.mapstruct.dto.subject.SubjectDto;
 import mate.academy.mapstruct.model.Subject;
+import org.mapstruct.Mapper;
 
+@Mapper(componentModel = "spring")
 public interface SubjectMapper {
     SubjectDto toDto(Subject subject);