I need some help to map Entity to DTO using Model Mapper.
Here are my two pojos
#Data
public class ClientDTO {
private UUID id;
#NotNull
private String name;
private String description;
private String contactEmail;
}
#Data
#Entity
public class Client {
#Id
private String id;
#NotNull
private String name;
private String description;
#NotNull
private String contactEmail;
}
When am trying to convert between Client to ClientDTO id is rendered as null. I tried writing a PropertyMap and a converter but none of them is working for me.
I went through the documentation and was able to find a solution to the problem. Here is the soln.
Initialization
private PropertyMap<Client, ClientDTO> clientMap;
private ModelMapper clientToClientDtoMapper;
Defining PropertyMap and Converter
clientToClientDtoMapper = new ModelMapper();
Converter<Client, UUID> uuidConverter = new AbstractConverter<Client, UUID>() {
protected UUID convert(Client source) {
return UUID.fromString(source.getId());
}
};
clientMap = new PropertyMap<Client, ClientDTO>() {
protected void configure() {
try {
using(uuidConverter).map(source).setId(null);
} catch (Exception ex) {
System.out.println("Error.");
}
}
};
clientToClientDtoMapper.addMappings(clientMap);
Helper method to convert from Entity to DTO
private ClientDTO convertToDto(Client client) {
ClientDTO clientDTO = clientToClientDtoMapper.map(client, ClientDTO.class);
return clientDTO;
}
Related
I am tring to mapping entity datas to DTOs using mapstruct.
And with these sources, I could map id,title datas.
But the problem is.... I can not map userName using these sources.
How can I resolve this problem??
#Entity // DB와의 연결을 위하여
#Data // getter setter
public class Board {
#Id // id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NotNull
#Size(min=2, max=30)
private String title;
#Length(min=20)
#Lob
#Column(columnDefinition="TEXT", nullable = false)
private String content;
#ManyToOne
#JoinColumn(name="userId", referencedColumnName = "id")
private User user;
}
#Builder
#AllArgsConstructor
#Data
public class BoardListDto {
private Long id;
private String title;
private String userName;
}
#Mapper(componentModel = "spring")
public interface BoardListMapper extends EntityMapper<BoardListDto, Board> {
#Override
#Mapping(target = "userName", source = "user.name.value")
List<BoardListDto> toDtos(List<Board> board);
}
public interface EntityMapper <D, E> {
E toEntity(D dto);
D toDto(E entity);
// Entity업데이트 시 null이 아닌 값만 업데이트 하도록 함.
#BeanMapping(nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE)
void updateFromDto(D dto, #MappingTarget E entity);
List<D> toDtos(List<E> entity);
}
no need to implement toDtos method for this. This code should be enough and Mapstruct will handle the rest alone.
#Mapper(componentModel = "spring")
public interface BoardListMapper extends EntityMapper<BoardListDto, Board> {
#Override
#Mapping(target = "userName", source = "user.name")
BoardListDto toDto(Board board);
}
So i have two classes,
class User:
#Data
#NoArgsConstructor
#Entity
public class User {
#Id
#GeneratedValue
private int id;
private String displayName;
private String email;
private String gender;
private String Nationality;
private int age;
#OneToMany(mappedBy = "id", cascade = CascadeType.ALL)
private List<Event> createdEvents;
#OneToMany(mappedBy = "id", cascade = CascadeType.ALL)
private List<Reservation> clientReservations;
}
and class Event:
#Data
#Entity
public class Event {
#Id
#GeneratedValue
private int id;
private String eventName;
private Date eventDate;
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "created_at", nullable = false, updatable = false)
#CreatedDate
private Date createdAt;
#ManyToOne
#JoinColumn(name="user_id")
private User user;
}
Contoller class:
#RestController
#RequestMapping("/event")
public class EventController {
#Autowired
private EventRepository eventRepository;
#PostMapping("/create")
public Event addEvent(#RequestBody Event event) {
return eventRepository.save(event);
}
}
Json:
"eventName": "theatre",
"eventDate": "2020-04-22",
"user": 3
im new to spring boot and what I've tried doesn't work.
now i want to add a single Event, and i need to pass a user id to reference the user who created the event, How can i do it ?
1.
In your Event class, add a constructor like this:
public Event(String eventName, Date eventDate, User user) {
this.createdAt = new DateTime();
this.eventName = eventName;
this.eventDate = eventDate;
this.user = user;
}
2.
Instead of passing Event as #RequestBody, consider creating a dto that handles submitted data on Post requests
public class EventDto {
private String eventName;
private String eventDateString;
private Long userId;
public String getEventName() {
return eventName;
}
public void setEventName(String eventName) {
this.eventName = eventName;
}
public String getEventDateString() {
return eventDateString;
}
public void setEventDateString(String eventDateString) {
this.eventDateString = eventDateString;
}
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
}
Then you must replace #RequestBody Event event with #RequestBody EventDto eventDto
3.
Inject UserRepository, handle data, check that submitted user id exists and save your Event
#PostMapping("/create")
public Event addEvent(#RequestBody EventDto eventDto) throws ParseException {
var user = userRepository.findById(eventDto.getUserId());
if (user.isPresent()) {
Event event = new Event(eventDto.eventName.trim(), new SimpleDateFormat("yyyy-MM-dd").parse(eventDto.eventDateString), user.get());
eventRepository.save(event);
}
}
I have 2 basic POJOs that i use to build a json object :
public class ProductCreateRequestModel {
private String name;
private double price;
private int qty;
private String imgPath;
private CategoryRequestCreateProductModel category;
}
public class CategoryRequestCreateProductModel {
private String name;
private String categoryKeyId;
}
Basically it allow me to use a simple json like this one :
{
"name": "Pizza,
"price": 344.0,
"qty": 15,
"imgPath": "new/pathImage",
"category": {
"categoryKeyId": "23ume70Fu6yqyGUWfQkW110P4ko3gZ",
"name": "Starter"
}
}
I want to send this JSON and persist datas and i expect an object in return that i build with this POJO:
public class ProductRest {
private String productKeyId;
private String name;
private double price;
private int qty;
private String imgPath;
private CategoryRest category;
}
In my controller i just have to call a method which use PostMapping
#PostMapping(
consumes = { MediaType.APPLICATION_XML_VALUE, MediaType.APPLICATION_JSON_VALUE },
produces = { MediaType.APPLICATION_XML_VALUE, MediaType.APPLICATION_JSON_VALUE }
)
public ProductRest createProduct(#RequestBody ProductCreateRequestModel productCreateRequestModel) throws Exception {
ProductRest returnValue = new ProductRest();
if(productCreateRequestModel.getName().isEmpty() || productCreateRequestModel.getPrice() <= 0)
throw new ApplicationServiceException(ErrorMessages.MISSING_REQUIRED_FIELDS.getErrorMessage());
ModelMapper modelMapper = new ModelMapper();
ProductDto productDto = modelMapper.map(productCreateRequestModel, ProductDto.class);
ProductDto createdProduct = productService.createProduct(productDto);
returnValue = modelMapper.map(createdProduct, ProductRest.class);
return returnValue;
}
My service layer is actually doing nothing special :
#Override
public ProductDto createProduct(ProductDto productDto) {
return productDto;
}
My DTO layer contains the following fields :
#Getter #Setter
public class ProductDto implements Serializable {
// ommit this member and do not generate getter / setter
#Getter(AccessLevel.NONE)
#Setter(AccessLevel.NONE)
private static final long serialVersionUID = 1L;
private Long id;
private String productKeyId;
private String name;
private double price;
private int availableQty;
private String imgPath;
private CategoryDto category = new CategoryDto();
}
#Getter #Setter
public class CategoryDto implements Serializable {
#Getter(AccessLevel.NONE)
#Setter(AccessLevel.NONE)
private static final long serialVersionUID = 1L;
private long id;
private String categoryKeyId;
private String name;
private CategoryDto parentCategory;
private List<CategoryDto> subCategories;
private String parentCategoryKeyId;
private Long parentCategoryId;
}
While trying to run this basic code I obtain an error message :
java.lang.NumberFormatException: For input string: "23ume70Fu6yqyGUWfQkW110P4ko3gZ"
I work with Spring JPA and have the following entity:
#Entity
#Table(name = Constants.ENTITY_TABLE_PREFIX + "ENTRY")
#XmlAccessorType(XmlAccessType.NONE)
#XmlRootElement(name = "monObj_info")
public class EntryXML implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#Column(name = "ID")
#GeneratedValue(strategy = GenerationType.IDENTITY)
#XmlAttribute
private long id;
#Column(name = "ip_address", nullable = true)
#XmlElement
private String ip_address;
#Column(name = "network_element_name", nullable = false)
#XmlElement
private String network_element_name;
public EntryXML() {}
public EntryXML(long id, String ip_address, String network_element_name) {
super();
this.id = id;
this.ip_address = ip_address;
this.network_element_name = network_element_name;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getIp_address() {
return ip_address;
}
public void setIp_address(String ip_address) {
this.ip_address = ip_address;
}
public String getNetwork_element_name() {
return network_element_name;
}
public void setNetwork_element_name(String network_element_name) {
this.network_element_name = network_element_name;
}
}
and the endpoint:
#RestController
public class EntryXMLEndpoint {
#Autowired
private IEntryXMLService service;
#RequestMapping(value = "/restxml", produces = { "application/xml" })
public EntryXML findEntries() {
EntryXML record = service.findById(1);
return record;
}
}
Now the requested response is:
<monObj_info id="1">
<atribute name="ip_address" value="xx.xxx.xxx.x"/>
<atribute name="network_element_name" value="xxxxxx"/>
</monObj_info>
Of course what I get is :
<monObj_info id="1">
<ip_address>xx.xxx.xxx.x</ip_address>
<network_element_name>xxxxxx</network_element_name>
</monObj_info>
I read similar posts , but the problem is I cannot create a List with the required elements inside my Entity Class, since it will not map with any column in the respective table, any suggestions?
You can achieve your goal in a straight-forward but somewhat hackish way.
Since you don't want the ip_address and network_element_name properties
to be marshalled and unmarshalled directly, you need to remove their #XmlElement annotation
and add #XmlTransient.
Instead, you want some <atribute name="..." value="..." /> elements marshalled and unmarshalled.
Therefore you need to add the following things to your EntryXML class:
an attributes property holding a list of attributes.
It is annotated with #XmlElement so that it will be part of XML marshalling and unmarshalling.
It is annotated with #Transient so that it will not be part of database persistence.
a simple helper class Attribute for holding name and value.
name and value are annotated with #XmlAttribute so that they will be part of XML marshalling and unmarshalling.
a Marshal Event Callback (beforeMarshal)
for doing the conversion from ip_address and network_element_name
to the attributes list.
an Unmarshal Event Callback (afterUnmarshal)
for doing the opposite conversion.
#XmlElement(name = "atribute")
#Transient // from package javax.persistence
private List<Attribute> attributes;
// there is no need for getAttributes and setAttributes methods
private static class Attribute {
#SuppressWarnings("unused") // called by the unmarshaller
Attribute() {
}
Attribute(String name, String value) {
this.name = name;
this.value = value;
}
#XmlAttribute
private String name;
#XmlAttribute
private String value;
}
#SuppressWarnings("unused") // this method is called only by the marshaller
private boolean beforeMarshal(Marshaller marshaller) {
attributes = new ArrayList<>();
attributes.add(new Attribute("ip_address", ip_address));
attributes.add(new Attribute("network_element_name", network_element_name));
return true;
}
#SuppressWarnings("unused") // this method is called only by the unmarshaller
private void afterUnmarshal(Unmarshaller unmarshaller, Object parent) {
if (attributes != null) {
for (Attribute attribute : attributes) {
switch (attribute.name) {
case "ip_address":
ip_address = attribute.value;
break;
case "network_element_name":
network_element_name = attribute.value;
break;
}
}
}
}
Then the XML output will look like this:
<monObj_info id="1">
<atribute name="ip_address" value="xx.xxx.xxx.x"/>
<atribute name="network_element_name" value="xxxxxx"/>
</monObj_info>
I have configured Spring Data JPA with Redis and using RedisRepositories with provides methods like find(), findAll() etc. All these methods seem to be working just fine, but I am not able to write my custom method like.
RedisEntity findByGenderAndGrade(String gender, String grade);
RedisEntity is a simple POJO Entity class. If you want any more info, please let me know in messages.
Following is my entity:
#Data
#RedisHash("test1")
public class RedisEntity implements Serializable {
#Id
#GeneratedValue
private String id;
private String name;
private String gender;
private Integer grade;
}
Repository:
#Repository
public interface TestRepository extends JpaRepository<RedisEntity, String> {
List<RedisEntity> findAllByGender(String gender);
List<RedisEntity> findAllByGrade(Integer grade);
}
Service/Controller:
#Override
public List<RedisEntity> getById(String id) {
return testRepository.findById(id); //returns data perfectly.
}
#Override
public List<RedisEntity> getAllByGender(String gender) {
return testRepository.findAllByGender(gender); //returns []
}
#Override
public void saveEntity(RedisEntity redisEntity) {
testRepository.save(redisEntity); // saves it in redis perfectly.
}
Also,
findByGender and findAllByGender both give [], although I can see data in my redis database and save it as well.
As requested by FrançoisDupire,
#Configuration
public class RedisConfig {
#Autowired
private DeploymentProperties deploymentProperties;
private static Logger logger = LoggerFactory.getLogger(RedisConfig.class);
#Bean
JedisConnectionFactory jedisConnectionFactory() {
RedisStandaloneConfiguration redisStandaloneConfiguration = new RedisStandaloneConfiguration("localhost", 6379);
redisStandaloneConfiguration.setPassword(RedisPassword.of("root"));
return new JedisConnectionFactory(redisStandaloneConfiguration);
}
#Bean
public RedisTemplate<String, Object> redisTemplate() {
RedisTemplate<String, Object> template = new RedisTemplate<>();
template.setConnectionFactory(jedisConnectionFactory());
return template;
}
}
Also, I had referred this article: Baeldung article on Spring data redis
As mentioned by #JoshJ and verified by myself and others,
The solution to the problem is:
Adding #Indexed annotation
to all those columns/fields which need to be used with all finds.
#Data
#RedisHash("EmployeeDetails")
public class RedisEntity {
#Id
private String employeeId;
private String firstName;
private String lastName;
#Indexed
private String gender;
#Indexed
private String grade;
}
We have the Spring Data Redis Library which provides the scope to write the custom method.Attaching Sample code.
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>2.0.8.RELEASE</version>
</dependency>
Entity Definition
#Data
#RedisHash("EmployeeDetails")
public class RedisEntity {
#Id
private String employeeId;
private String firstName;
private String lastName;
private String gender;
private String grade;
}
Repository Definition
#Repository
public interface RedisEntityRepository extends CrudRepository<RedisEntity, String>{
List<RedisEntity> findAllByGenderAndGrade(String gender, String grade);
}
Implementation
#Component
public class RedisEntityImpl implements RedisEntityService {
#Autowired
private RedisEntityRepository redisEntityRepository;
#Override
public List<RedisEntity> getAllByGenderAndGrade(String gender, String grade) {
return redisEntityRepository.findAllByGenderAndGrade(gender,grade);
}
}
Properties
spring.cache.type = redis
spring.redis.host = localhost
spring.redis.port = 6379