created mappers and MapperConfig

src/main/java/mate/academy/mapstruct/config/MapperConfig.java

@@ -0,0 +1,14 @@
+package mate.academy.mapstruct.config;
+
+import org.mapstruct.InjectionStrategy;
+import org.mapstruct.NullValueCheckStrategy;
+import org.mapstruct.ReportingPolicy;
+
+@org.mapstruct.MapperConfig(
+        componentModel = "spring",
+        injectionStrategy = InjectionStrategy.CONSTRUCTOR,
+        nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS,
+        unmappedTargetPolicy = ReportingPolicy.IGNORE
+)
+public interface MapperConfig {
+}

src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java

@@ -1,9 +1,12 @@
 package mate.academy.mapstruct.mapper;
 
+import mate.academy.mapstruct.config.MapperConfig;
 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(config = MapperConfig.class)
 public interface GroupMapper {
     GroupDto toDto(Group group);
 

src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java

@@ -1,14 +1,60 @@
 package mate.academy.mapstruct.mapper;
 
+import java.util.List;
+import java.util.stream.Collectors;
+import mate.academy.mapstruct.config.MapperConfig;
 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;
 
+@Mapper(config = MapperConfig.class)
 public interface StudentMapper {
+
+    @Mapping(target = "groupId", source = "group.id")
+    @Mapping(target = "subjectIds", ignore = true)
     StudentDto toDto(Student student);
 
+    @Mapping(target = "groupId", source = "group.id")
     StudentWithoutSubjectsDto toStudentWithoutSubjectsDto(Student student);
 
+    @Mapping(target = "group", ignore = true)
+    @Mapping(target = "subjects", ignore = true)
     Student toModel(CreateStudentRequestDto requestDto);
+
+    @AfterMapping
+    default void setGroupAndSubjects(@MappingTarget Student student,
+                                     CreateStudentRequestDto requestDto) {
+        if (requestDto.groupId() != null) {
+            Group group = new Group();
+            group.setId(requestDto.groupId());
+            student.setGroup(group);
+        }
+
+        if (requestDto.subjects() != null) {
+            List<Subject> subjects = requestDto.subjects().stream()
+                    .map(id -> {
+                        Subject subject = new Subject();
+                        subject.setId(id);
+                        return subject;
+                    })
+                    .collect(Collectors.toList());
+            student.setSubjects(subjects);
+        }
+    }
+
+    @AfterMapping
+    default void setSubjectIds(@MappingTarget StudentDto studentDto, Student student) {
+        if (student.getSubjects() != null) {
+            studentDto.setSubjectIds(student.getSubjects().stream()
+                    .map(Subject::getId)
+                    .collect(Collectors.toList()));
+        }
+    }
 }

src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java

@@ -1,9 +1,12 @@
 package mate.academy.mapstruct.mapper;
 
+import mate.academy.mapstruct.config.MapperConfig;
 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(config = MapperConfig.class)
 public interface SubjectMapper {
     SubjectDto toDto(Subject subject);