I am using Spring Boot to create a Rest Service to return some Json. Below is the model in question, in which I am suppressing the id from being serialized to Json with #JsonIgnore
//imports
#Entity
#Table(name="tags")
public class Tag {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column(name="id")
private int id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name="post_id")
#JsonBackReference
private Post post;
#Column(name="tag")
private String tag;
//....
#JsonIgnore
public int getId() {
return id;
}
#JsonSetter
public void setId(int id) {
this.id = id;
}
//...
}
But I would also like to suppress the "tag" tag. That is, I'd like the output to look like a String array rather than array of Javascript objects containing a string.
The current output is:
{
"id": 1,
"title": "welcome to the blog",
"body": "Lorem, ipsum...",
"tags" : [
{"tag" : "webdev"},
{"tag" : "coding"},
{"tag" : "news"}
]
}
But I would like to get the output like:
{
"id": 1,
"title": "welcome to the blog",
"body": "Lorem, ipsum...",
"tags": [
"webdev",
"coding",
"news"
]
}
Can this be done with an annotation of some sort?
Related
I'm using Jackson to serialise My Rest Api
POJO :
#Data
#Entity
#NoArgsConstructor
#AllArgsConstructor
#JsonTypeInfo(include= JsonTypeInfo.As.WRAPPER_OBJECT,use= JsonTypeInfo.Id.NAME)
public class Project implements Serializable {
#Id #GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String projectName;
private String resource;
#ManyToMany
private List<Collaborator> collaborators;
#JsonIgnore
#OneToMany(mappedBy = "project",cascade = CascadeType.ALL)
private List<Task> tasks;
public Project(String projectName, String resource) {
this.projectName = projectName;
this.resource = resource;
}
}
output:
{
"id": 1,
"dateDebut": "2022-05-31T13:14:39.091+00:00",
"dateFin": "2022-05-31T13:14:39.091+00:00",
"project": {
"Project": {
"id": 2,
"projectName": "project Suivi Activite 2",
"resource": "resource 2",
"collaborators": []
}
},
"collaborator": null,
"days": []
}
how can i avoid field "Project" inside "project" ?
#JsonTypeInfo(include= JsonTypeInfo.As.WRAPPER_OBJECT,use= JsonTypeInfo.Id.NAME) ?
I have a problem about updating the movie.
I wrote a function that is named for "update" in MovieService.
Here is that function which is shown below.
public void update(Long id,Movie movie) {
boolean isUpdatingEmployee = (movie.getId() == id);
if (isUpdatingEmployee) {
Movie existingMovie = movieRepository.findById(movie.getId()).get();
existingMovie.setId(id);
existingMovie.setName(movie.getName());
existingMovie.setRating(movie.getRating());
existingMovie.setDirector(movie.getDirector());
existingMovie.setGenres(movie.getGenres());
existingMovie.setCreatedAt(movie.getCreatedAt());
movieRepository.save(existingMovie);
}
}
When ı try to update a movie after saving it, I got this kind of JSON result and that's why the update process cannot be done.
http://localhost:8082/api/v1/movie/update/1
Body Request
{
"name": "MovieC",
"genres": [
{
"name" : "Adventure"
},
{
"name" : "Action"
}
],
"createdAt": "2021-04-28",
"rating" : 9,
"director" : {
"name" : "Director 2"
}
}
The result of JSON after updating the process.
{
"id": null,
"name": "MovieC",
"genres": [
{
"id": null,
"name": "Action"
},
{
"id": null,
"name": "Adventure"
}
],
"rating": 9.0,
"createdAt": "2021-04-28",
"director": {
"id": null,
"name": "Director 2"
}
}
Here is my Movie entity which is shown below.
#Entity
#Getter
#Setter
#ToString
#AllArgsConstructor
#NoArgsConstructor
public class Movie implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
#JsonManagedReference
#OneToMany(mappedBy="movie",cascade = CascadeType.ALL,fetch = FetchType.EAGER)
private Set<Genre> genres;
private Double rating;
private LocalDate createdAt;
#ManyToOne(cascade=CascadeType.ALL,fetch = FetchType.EAGER)
#JoinColumn
private Director director;
}
Here is my Director entity which is shown below.
#Entity
#Getter
#Setter
#ToString
#RequiredArgsConstructor
#NoArgsConstructor
#JsonIgnoreProperties({"movies"})
public class Director implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NonNull
private String name;
#OneToMany(mappedBy="director",cascade = CascadeType.ALL,fetch = FetchType.EAGER)
private Set<Movie> movies;
}
Here is my Genre entity which is shown below.
#Entity
#Getter
#Setter
#ToString
#RequiredArgsConstructor
#NoArgsConstructor
#JsonIgnoreProperties({"movie"})
public class Genre implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NonNull
private String name;
#JsonBackReference
#ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
#JoinColumn
private Movie movie;
}
Here is my sample project link : Project Link
How can I fix it?
As per your code, this is your request:
http://localhost:8082/api/v1/movie/update/1
{
"name": "MovieC",
"genres": [
{
"name" : "Adventure"
},
{
"name" : "Action"
}
],
"createdAt": "2021-04-28",
"rating" : 9,
"director" : {
"name" : "Director 2"
}
}
Now consider this snippet from your code:
public void update(Long id,Movie movie) {
boolean isUpdatingEmployee = (movie.getId() == id);
if (isUpdatingEmployee) {
...
Your id will be 1 as you've set this in your path variable.
However, movie.getId() will be null since I don't see it in your RequestBody.
And so:
isUpdatingEmployee = (movie.getId() == id)`
isUpdatingEmployee = ( null == 1)
isUpdatingEmployee = false
this will always give you false so I don't think this will enter in your update logic.
I think the problem because you are returning the same object movie you passed in the body of the post method in the controller - https://github.com/Rapter1990/springboothazelcast/blob/3157f354a628d418cccb99cfdbd188f594c24e9c/src/main/java/com/springboot/hazelcast/controller/MovieController.java#L64
You should rewrite it to something like this:
#PostMapping("/save")
public Movie saveMovie(#RequestBody Movie movie) throws ParseException {
LOG.info("MovieController | Saving Movie.");
return movieService.save(movie);
}
Here is the link to CRUDRepository javadocs:
https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/repository/CrudRepository.html#save-S-
Getting stuck trying to fetch the latest record from a Join
I have the following classes
Author
#Entity
#Table(name = "author")
public class Author {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column(name = "name")
private String name;
#OneToMany
#JoinColumn(name = "author_id", referencedColumnName = "id")
#OrderBy("id Desc")
private List<Book> books;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Book> getBooks() {
return books;
}
public void setBooks(List<Book> books) {
this.books = books;
}
}
Book
#Entity
#Table(name = "book")
public class Book {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Column(name = "author_id")
private Integer authorId;
#Column(name = "date_published")
private Date datePublished;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Integer getAuthorId() {
return authorId;
}
public void setAuthorId(Integer authorId) {
this.authorId = authorId;
}
public Date getDatePublished() {
return datePublished;
}
public void setDatePublished(Date datePublished) {
this.datePublished = datePublished;
}
}
Repository
#Repository
public interface AuthorRepository extends
JpaRepository<Author, Long> {
public Page<Author> findALL(int id, Pageable pageable);
}
Current results
{
"id": 1,
"name": "James",
"books":[
{
"id": 1,
"name": "book1",
"datePublished": '12/12/2012'
},
{
"id": 1,
"name": "book2",
"datePublished": '01/02/2013'
}]
},
{
"id": 2,
"name": "Tim",
"books":[
{
"id": 5,
"name": "book5",
"datePublished": '12/12/2014'
},{
"id": 6,
"name": "book6",
"datePublished": '01/02/2015'
}]
}
Expected Result
{
"id": 1,
"name": "James",
"books":[
{
"id": 1,
"name": "book2",
"datePublished": '01/02/2013'
}]
},
{
"id": 2,
"name": "Tim",
"books":[
{
"id": 6,
"name": "book6",
"datePublished": '01/02/2015'
}]
}
From this a list of Authors are being returned with all their respective books.
Question is how can JPA assist me to pick only the latest book from the collection based on date published.
If you are using hibernate you can achieve this using #JoinFormula to map the latest record by date. Something like:
#ManyToOne(fetch = FetchType.LAZY)
#JoinFormula("(" +
"SELECT b.id " +
"FROM book b " +
"WHERE b.author_id = id " +
"ORDER BY b.date_published DESC " +
"LIMIT 1" +
")")
private Book latestBook;
I had similar problem. The other solution is with #Where annotation:
#OneToMany
#JoinColumn(name = "author_id", referencedColumnName = "id")
#Where(clause = "date_published = (SELECT MAX(book.date_published) " +
"FROM book" +
"where author_id = book.author_id)")
#OrderBy("datePublished Desc")
private List<Book> books;
My post on stack: Get applications with their latest status only
if you want to get last book for each author , you can add transient field to get it :
#Entity
#Table(name = "author")
public class Author {
.......
#Transient
private Book lastBook;
#PostLoad
private void setLastBook() {
if(books==null || books,isEmpty())
this.lastBook=null;
}else{
this.lastBook=books.get(0);
}
}
or make it one to one and save it in db by same method annotated with #PostPersist and #PostUpdate. it will save in db automatically last book
the answer by #Seldo97 is correct, but he missed the space between "book" and "where" in the Select query, which will throw an error.
so basically it should be
#OneToMany
#JoinColumn(name = "author_id", referencedColumnName = "id")
#Where(clause = "date_published = (SELECT MAX(book.date_published) " +
"FROM book" +
" where author_id = book.author_id)")
#OrderBy("datePublished Desc")
private List<Book> books;
author_id -> basically refers to foreign key column name in the child.
entity
date_published -> this refers to the column by which we want to
sort(in this case the date column name).
so, the above query will take the record with the latest date and put it in the list object:
List<book> book;
I have two entities defined:
#Entity
public class VideoPost {
private #Id
#GeneratedValue(strategy= GenerationType.IDENTITY) Long id;
private String videoTitle;
private #ManyToOne #JoinColumn(name = "VideoPost_Id") User uploader;
private boolean isPublished = false;
//....
}
#Entity
public class User {
private #Id #GeneratedValue(strategy=GenerationType.IDENTITY) Long id;
private String userName;
private Date registrationDate;
#OneToMany(mappedBy = "uploader", cascade = CascadeType.ALL) private List<VideoPost> videoPosts;
//...
}
I have following JSON response to the call to /api/videoposts:
"_embedded" : {
"videoPosts" : [ {
"videoTitle" : "test video 1",
"uploadDate" : "2017-06-03T11:44:02.012+0000",
"_links" : {
"self" : {
"href" : "http://localhost:8080/api/videoPosts/1"
},
"videoPost" : {
"href" : "http://localhost:8080/api/videoPosts/1"
},
"uploader" : {
"href" : "http://localhost:8080/api/videoPosts/1/uploader"
}
}
} ]
I would like to expose the uploader name inside this response directly. I.e.
"uploader" : {
"userName": theName
"href" : "http://localhost:8080/api/videoPosts/1/uploader"
}
How could I achieve this?
You can check Projections where you can customize you objects the way you want whether you want to show the whole nested attributes or some of them or even hide these nested objects
I have a badly designed document structure:
{
"_index": "items",
"_type": "item",
"_id": "CD5D8F6516A88805FA826C10777B1750D9AAF5DA9CDD8E264757AB7EEC22B1EB",
"_score": 1,
"_source": {
"title": "Textverständnis 5",
"active": true,
"successorId": null,
"metadata": {
"Fach": "DE",
"Kompetenz": "Les",
"code": "C_SX_DE_Les_A0016_00149_V00",
...
}
}
}
I would like to retrieve the the title, Fach, and code from the above document.
#Document(indexName = "items", type = "item")
#Data
public class Item {
#Id
private String id;
private String title;
private Metadata metadata;
#Data
static class Metadata {
private String Fach;
private String code;
}
}
Retrieving the title, code are ok, but the Fach field returns null. Do you know how could I map this field? It seems the issue is with the upper case, but unfortunately I cannot change the document structure.
Could you help?
Thanks.
was solved using Jackson's #JsonProperty annotation like:
#Document(indexName = "items", type = "item")
#Data
public class Item {
#Id
private String id;
private String title;
private Metadata metadata;
#Data
static class Metadata {
#JsonProperty("Fach")
private String subject;
private String code;
}
}