diff --git a/src/main/java/mate/academy/mapstruct/config/MapperConfig.java b/src/main/java/mate/academy/mapstruct/config/MapperConfig.java
new file mode 100644
index 0000000..6b9d1cc
--- /dev/null
+++ b/src/main/java/mate/academy/mapstruct/config/MapperConfig.java
@@ -0,0 +1,13 @@
+package mate.academy.mapstruct.config;
+
+import org.mapstruct.InjectionStrategy;
+import org.mapstruct.NullValueCheckStrategy;
+
+@org.mapstruct.MapperConfig(
+        componentModel = "spring",
+        injectionStrategy = InjectionStrategy.CONSTRUCTOR,
+        nullValueCheckStrategy = NullValueCheckStrategy.ALWAYS,
+        implementationPackage = "<PACKAGE_NAME>.impl"
+)
+public class MapperConfig {
+}
diff --git a/src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java b/src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java
index d60c9df..eba22bb 100644
--- a/src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java
+++ b/src/main/java/mate/academy/mapstruct/mapper/GroupMapper.java
@@ -1,11 +1,25 @@
 package mate.academy.mapstruct.mapper;
 
+import java.util.Optional;
+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;
+import org.mapstruct.Mapping;
+import org.mapstruct.Named;
 
+@Mapper(config = MapperConfig.class)
 public interface GroupMapper {
     GroupDto toDto(Group group);
 
+    @Mapping(target = "id", ignore = true)
     Group toModel(CreateGroupRequestDto requestDto);
+
+    @Named("groupById")
+    default Group groupById(Long id) {
+        return Optional.ofNullable(id)
+                .map(Group::new)
+                .orElse(null);
+    }
 }
diff --git a/src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java b/src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java
index 853e6b1..b24c783 100644
--- a/src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java
+++ b/src/main/java/mate/academy/mapstruct/mapper/StudentMapper.java
@@ -1,14 +1,26 @@
 package mate.academy.mapstruct.mapper;
 
+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.Student;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
 
+@Mapper(config = MapperConfig.class, uses = {GroupMapper.class, SubjectMapper.class})
 public interface StudentMapper {
+
+    @Mapping(source = "group.id", target = "groupId")
+    @Mapping(source = "subjects", target = "subjectIds", qualifiedByName = "subjectsById")
     StudentDto toDto(Student student);
 
+    @Mapping(target = "groupId", source = "group.id")
     StudentWithoutSubjectsDto toStudentWithoutSubjectsDto(Student student);
 
+    @Mapping(target = "id", ignore = true)
+    @Mapping(target = "group", source = "groupId", qualifiedByName = "groupById")
+    @Mapping(target = "subjects", source = "subjects", qualifiedByName = "subjectIdToSubject")
+    @Mapping(target = "socialSecurityNumber", ignore = true)
     Student toModel(CreateStudentRequestDto requestDto);
 }
diff --git a/src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java b/src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java
index 2906e78..0f8d0ab 100644
--- a/src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java
+++ b/src/main/java/mate/academy/mapstruct/mapper/SubjectMapper.java
@@ -1,11 +1,37 @@
 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.subject.CreateSubjectRequestDto;
 import mate.academy.mapstruct.dto.subject.SubjectDto;
 import mate.academy.mapstruct.model.Subject;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.Named;
 
+@Mapper(config = MapperConfig.class)
 public interface SubjectMapper {
     SubjectDto toDto(Subject subject);
 
+    @Mapping(target = "id", ignore = true)
     Subject toModel(CreateSubjectRequestDto requestDto);
+
+    @Named("subjectsById")
+    default List<Long> subjectsById(List<Subject> subjects) {
+        return subjects == null ? null : subjects.stream()
+                .map(Subject::getId)
+                .collect(Collectors.toList());
+    }
+
+    @Named("subjectIdToSubject")
+    default List<Subject> subjectIdToSubject(List<Long> subjects) {
+        return subjects == null ? null : subjects.stream()
+                .map(id -> {
+                    Subject subject = new Subject();
+                    subject.setId(id);
+                    return subject;
+                })
+                .collect(Collectors.toList());
+    }
 }
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index 9b8695a..2baeb96 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -1,6 +1,6 @@
 spring.datasource.url=jdbc:mysql://localhost:3306/mapstruct?createDatabaseIfNotExist=true
-spring.datasource.username=<YOUR_LOGIN>
-spring.datasource.password=<YOUR_PASSWORD>
+spring.datasource.username=root
+spring.datasource.password=Styczen10!
 spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
 spring.jpa.hibernate.ddl-auto=create-drop
 spring.jpa.show-sql=true