MongoDB relashionships+SpringBoot REST API+POST Method - spring

I used SpringBoot REST API Microservices with MongoDB.
I have three services such as player, game and score.
For each services I have a MongoDB databases.
In the POST Method in the Score service, I check if the plyare and game exist, then for existed a player and a game, create a new score.
for doing this, at first I used player-repository and game-repository for checking they are exist or not but after that I read some documents about Relashionships(OneToMany, ManyToOne) and about Refrence, #DBRef, and I tried using them.
The problem is for example in the relationships, I am interested in to have just the variable nickname which is ID in the Player Class and the variable code which is ID in the Game Class and not other variables, instead, in the Score Class when I define
private Player player;
I have an object of Player class with all its member variables, and it is the same situation for game.
I am interested in this form for Score:
## player
{
“nickname”: “pippo”,
“firstname”: “Filippo”,
“lastname”: “Rossi”,
“email”: “filipporox#mail.com”
}
## game
{
“code”: “XFR453”,
“title”: “The Game”,
“softwarehouse”: “SWGameS”,
“version”: “1”,
“releaseyear”: “2020”
}
***## score
{
“player”: “pippo”,
“game”: “XFR453”,
“score”: “232209”,
“date”: “2020/04/28”,
“history”: [
{ “score”: “232209”, “date”: “2020/04/28” },
{ “score”: “220011”, “date”: “2020/04/23” },
{ “score”: “182210”, “date”: “2020/03/12” }
]
}***
could you help me how can I deal the above example?
Score Class:
#Document(collection = "score")
public class Score {
#Id
#NotBlank
#JsonView(Views.class)
private String scoreid;
#JsonView(Views.class)
private Long score;
#JsonView(Views.class)
private Date date;
#NotBlank
#JsonView(Views.class)
private Player player;
#NotBlank
#JsonView(Views.class)
private Game game;
public List<String> history;
public String getScoreid() {
return scoreid;
}
public void setScoreid(String scoreid) {
this.scoreid = scoreid;
}
public Long getScore() {
return score;
}
public void setScore(Long score) {
this.score = score;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public Player getPlayer() {
return player;
}
public void setPlayer(Player player) {
this.player = player;
}
public Game getGame() {
return game;
}
public void setGame(Game game) {
this.game = game;
}
public List<String> getHistory() {
return history;
}
public void setHistory(List<String> history) {
this.history = history;
}
}
sorry for my bad English.

Related

Spring Boot Rest

i am practicing with spring boot for work with restful applications
I have set a #RestController and #Entity like this
#RestController
#RequestMapping(value = "/api")
public class RestControllerCar {
#Autowired
private CarRepository carRepository;
#RequestMapping(value = "/cars")
public Iterable<Car> getCars() {
return carRepository.findAll();
}
}
and
#Entity
public class Car {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String brand, model, color, registerNumber;
private Integer year, price;
#JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
#ManyToMany(mappedBy = "cars")
private Set<Owner> owners;
public Car() {
}
public Car(String brand, String model, String color, String registerNumber, Integer year, Integer price) {
super();
this.brand = brand;
this.model = model;
this.color = color;
this.registerNumber = registerNumber;
this.year = year;
this.price = price;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public String getRegisterNumber() {
return registerNumber;
}
public void setRegisterNumber(String registerNumber) {
this.registerNumber = registerNumber;
}
public Integer getYear() {
return year;
}
public void setYear(Integer year) {
this.year = year;
}
public Integer getPrice() {
return price;
}
public void setPrice(Integer price) {
this.price = price;
}
public Set<Owner> getOwner() {
return owners;
}
public void setOwner(Set<Owner> owners) {
this.owners = owners;
}
when i use postman to http://localhost:8080/cardatabase/api/cars i get a list of Cars
but even if i go to http://localhost:8081/cardatabase/cars, with _embedded on the top
it`s normal?
Thanks!!!!
Is your repository annotated #RestRepository? The _embedded make me think to the kind of output given by a #RestRepository for an array.
#RestRepository auto create all endpoint. As #M.Deinum pointed out, with the data rest starter, if ou remove it , you only have your controller, and not the one generated by #RestRepository.
Two main choices here:
You dont annotate the Repository. Just an interface which implement JpaRepository<YourEntity, TypeOfYourID> and use your controllers
You use only the auto created controllers by #RestRepository.
Or, you can install swagger2 on your project, so, accessing the docs on your browser, you will see all available endpoints, and it may be more clear for you.
With swagger you will also see what is the return type of the endpoint, the parameters etc..
Swagger is really easy to install in a project and to use. (dependencies, one annotation and it's good.. for basic usage).

500 Internal Server Error; when using POST method in springBoot rest api

I used Spring Boot, POST method for create a new score for my player.
In POST method, I check if the player and game exists then create new score and also add score and its related date into the history of my score's class.
Each score has history which contains score and its date. the history has type list of History's class
The History Class:
package thesisMongoProject;
import java.util.Date;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
#Document(collection = "history")
public class History {
#Id
private String score;
private Date date;
public History(String score, Date date) {
super();
this.score = score;
this.date = date;
}
public String getScore() {
return score;
}
public void setScore(String score) {
this.score = score;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
#Override
public String toString() {
return "History [score=" + score + ", date=" + date + "]";
}
}
The Score Class:
package thesisMongoProject;
import java.util.Date;
import java.util.List;
import javax.validation.constraints.NotBlank;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import com.fasterxml.jackson.annotation.JsonView;
#Document(collection = "score")
public class Score {
#Id
#NotBlank
#JsonView(Views.class)
private String score;
#NotBlank
#JsonView(Views.class)
private String player;
#NotBlank
#JsonView(Views.class)
private String code;
#JsonView(Views.class)
private Date date;
private List<History> history;
public Score(#NotBlank String score, String player, String code, List<History> history, Date date) {
super();
this.score = score;
this.player = player;
this.code = code;
this.history = history;
this.date = date;
}
public String getScore() {
return score;
}
public void setScore(String score) {
this.score = score;
}
public String getPlayer() {
return player;
}
public void setPlayer(String player) {
this.player = player;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public List<History> getHistory() {
return history;
}
public void setHistory(List<History> history) {
this.history = history;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
#Override
public String toString() {
return "Score [score=" + score + ", player=" + player + ", code=" + code + ", history=" + history + ", date="
+ date + "]";
}
}
And the POST method:
#RestController
#RequestMapping("/score")
public class ScoreController {
#Autowired
private ScoreRepository srepo;
#Autowired
private PlayerRepository prepo;
#Autowired
private GamesRepository grepo;
#Autowired
private HistoryRepository hrepo;
private List<History> history;
private History h = null;
//Create Score
#PostMapping
public ResponseEntity<?> createScore(#RequestBody #JsonView(Views.class) #Valid Score score) {
//check player exist
Player p = prepo.findByNickname(score.getPlayer());
//check game's cod exist
Games g = grepo.findByCode(score.getCode());
//check score exist
Score s = srepo.findByScore(score.getScore());
// = hrepo.findByScore(score.getScore());
if(s != null)
{
return ResponseEntity.status(409).body("Conflict!!");
}else if((p != null) && (g != null)) {
h.setScore(score.getScore());
h.setDate(score.getDate());
hrepo.save(h);
history.add(h);
//history.add(hrepo.findById(score.getScore()).get());
score.setHistory(history);
srepo.save(score);
return ResponseEntity.status(201).body("Created!");
}
else {
return ResponseEntity.status(400).body("Bad Request!");
}
}
In my POST method I tried to setScore and setDate for an object of History class, and then I saved them by hrepo which is history Repository and then I added this to the history variable of type List<History>, after that I setHistory of my score class with srepo, Score repository . But when I execute my program, in PostMan I have 500 Internal Server Error and in the console I have this Error:
java.lang.NullPointerException: null
at thesisMongoProject.controller.ScoreController.createScore(ScoreController.java:63) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
which is exactly the line that I setScore of object h, h.setScore(score.getScore());
I cannot understand what is my mistake.
Initialize both, you should not get NPE after that
private List<History> history=new ArrayList<>();
private History h = new History();
field h in this line
private History h = null;
may be local variable like below.
}else if((p != null) && (g != null)) {
History h = new History(); //add local variable here.
h.setScore(score.getScore());

How can I update specific filed of my class by PUT method in SpringBoot rest api

I used SpringBoot, and in the PUT method I check if the score exists then I want to update the score and also update the history by adding the latest score to it.
The Score Class:
package thesisMongoProject;
import java.util.Date;
import java.util.List;
import javax.validation.constraints.NotBlank;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import com.fasterxml.jackson.annotation.JsonView;
#Document(collection = "score")
public class Score {
#Id
#NotBlank
#JsonView(Views.class)
private String score;
#NotBlank
#JsonView(Views.class)
private String player;
#NotBlank
#JsonView(Views.class)
private String code;
#JsonView(Views.class)
private Date date;
private List<History> history;
public String getScore() {
return score;
}
public void setScore(String score) {
this.score = score;
}
public String getPlayer() {
return player;
}
public void setPlayer(String player) {
this.player = player;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public List<History> getHistory() {
return history;
}
public void setHistory(List<History> history) {
this.history = history;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
#Override
public String toString() {
return "Score [score=" + score + ", player=" + player + ", code=" + code + ", history=" + history + ", date="
+ date + "]";
}
}
The ScoreRepository:
package thesisMongoProject.Repository;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;
import thesisMongoProject.Score;
import thesisMongoProject.ScoreDto;
#Repository
public interface ScoreRepository extends MongoRepository<Score, String>{
public Score findByScore(String score);
public void save(ScoreDto scoredto, String score);
}
But the PUT method save a new instance into the MongoDB instead of updating the existing one
The PUT method:
//Update Score By ID
#PutMapping("/{score}")
public ResponseEntity<?> updatePlayerByID(
#PathVariable("score")String score,
#RequestBody #JsonView(Views.class) #Valid Score score1){
Score findscore = srepo.findByScore(score);
if(findscore == null)
return ResponseEntity.status(404).body("There is not Score!");
else {
history = new ArrayList<History>();
h = new History();
h.setScore(score1.getScore());
h.setDate(score1.getDate());
history.add(h);
score1.setHistory(history);
srepo.save(score1);
return ResponseEntity.ok(score1);
}
}
Also i tried to use ScoreDTO and #PatchMapping like this:
The ScoreDTo Class:
package thesisMongoProject;
import java.util.List;
public class ScoreDto {
private String score;
List<History> history;
public String getScore() {
return score;
}
public void setScore(String score) {
this.score = score;
}
public List<History> getHistory() {
return history;
}
public void setHistory(List<History> history) {
this.history = history;
}
}
And the PATCHMAPPING:
#PatchMapping("/{score}")
public ResponseEntity<?> updateByScore(
#PathVariable("score")String score,
#RequestBody ScoreDto score1){
Score findscore = srepo.findByScore(score);
if(findscore == null)
return ResponseEntity.status(404).body("There is not Score!");
else {
srepo.save(score1, score);
return ResponseEntity.ok(score1);
}
}
but in my console I have an error:
org.springframework.data.mapping.PropertyReferenceException: No property save found for type Score! Did you mean 'date'?
could you help me how can i update the existing field of score, please?!
The primary key of a database should not be mutable. If there are multiple players with the same score, the earlier players' data would be replaced.
Ideally, for updating an existing document where id and all its new fields are known, something like this can be done:
score1.setScore(score);
srepo.save(score1);
Assuming score is the id of the document that is to be updated and score1 contains all other fields correctly, this will replace the existing document with id score with the new one score1.
In the first code ( the PUT method ), score1 should have the same id as findscore, then it will update the existing document.
Score findscore = srepo.findByScore(score);
if(findscore == null)
return ResponseEntity.status(404).body("There is not Score!");
else {
history = new ArrayList<History>();
h = new History();
h.setScore(score1.getScore());
h.setDate(score1.getDate());
history.add(h);
Also, for the exception you are getting, this save method
public void save(ScoreDto scoredto, String score);
can't be handled by the spring data repository automatically, you will have to define its implementation. More on what kind of methods can be defined or not here. The Standard save method in the repository can be used to achieve the required.

JPA - Get values from fields in other entities in a Controller class

I have two entities: Room and Service. I also have a method in Logic class that i want to use in ServiceController class. Other classes are irrelevant.
room.getBeds() always returns 0, default int value.
Room entity:
#Entity
public class Room {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int room_id;
private int beds;
private int number;
public Room() {
}
public Room(int beds, int number) {
this.beds = beds;
this.number = number;
}
public int getRoom_id() {
return room_id;
}
public void setRoom_id(int room_id) {
this.room_id = room_id;
}
public int getBeds() {
return beds;
}
public void setBeds(int beds) {
this.beds = beds;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
}
Service entity:
#Entity
public class Service {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int service_id;
#JsonFormat(pattern = "dd/MM/yyyy", timezone = "Europe/Berlin")
private Date arrival_at;
#JsonFormat(pattern = "dd/MM/yyyy", timezone = "Europe/Berlin")
private Date departure_at;
private int meals;
private int guest_id;
private double price;
public int getService_id() {
return service_id;
}
public void setService_id(int service_id) {
this.service_id = service_id;
}
public Date getArrival_at() {
return arrival_at;
}
public void setArrival_at(Date arrival_at) {
this.arrival_at = arrival_at;
}
public Date getDeparture_at() {
return departure_at;
}
public void setDeparture_at(Date departure_at) {
this.departure_at = departure_at;
}
public int getMeals() {
return meals;
}
public void setMeals(int meals) {
this.meals = meals;
}
public int getGuest_id() {
return guest_id;
}
public void setGuest_id(int guest_id) {
this.guest_id = guest_id;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
Service controller:
#RestController
public class ServiceController {
#Autowired
ServiceRepository serviceRepository;
private Logic logic = new Logic();
private Room room = new Room();
//CREATE
#PostMapping("/services")
public int createService(#RequestBody Service service) {
service.setPrice(logic.calculatePrice(service.getArrival_at(), service.getDeparture_at(), room.getBeds(), service.getMeals()));
return serviceRepository.save(service);
}
}
How to get the correct value from room.getBeds() getter?
Lerius you are just making a new object of Room Entity and are not populating any values from your Database to that object
that is the reason why it is taking room.getBeds(); as 0(i.e default value for int)
Try Populating DB values to your object after that you will be able to get the value of getBeds();

Dynamic MongoDB collection in spring boot

I want to create a MongoDB collection for each month dynamically.
Example: viewLog_01_2018, viewLog_02_2018
#Document(collection = "#{viewLogRepositoryImpl.getCollectionName()}")
#CompoundIndexes({
#CompoundIndex(def = "{'viewer':1, 'viewed':1}", name = "viewerViewedIndex",unique=true)
})
public class ViewLog {
private Integer viewer;
private Integer viewed;
private Date time;
public Integer getViewer() {
return viewer;
}
public void setViewer(Integer viewer) {
this.viewer = viewer;
}
public Integer getViewed() {
return viewed;
}
public void setViewed(Integer viewed) {
this.viewed = viewed;
}
public Date getTime() {
return time;
}
public void setTime(Date time) {
this.time = time;
}
}
The implementation for the collection name is as follows:
#Repository
public class ViewLogRepositoryImpl implements ViewLogRepositoryCustom {
private String collectionName;
public ViewLogRepositoryImpl() {
CommonUtility common = new CommonUtility();
Pair<Integer, Integer> pair = common.getStartingEndingDateOfMonth();
setCollectionName("viewLog_"+pair.getFirst()+"_"+pair.getSecond());
}
#Override
public String getCollectionName() {
return collectionName;
}
#Override
public void setCollectionName(String collectionName) {
this.collectionName = collectionName;
}
}
On my each request, to save a document, I am setting the collection name as:
#Autowired
ViewLogRepository viewLogRepository;
public boolean createLog(int viewer, int viewed,String viewed_mmm, Date time){
CommonUtility common = new CommonUtility();
Pair<Integer, Integer> pair = common.getStartingEndingDateOfMonth();
viewLogRepository.setCollectionName("viewLog_"+pair.getFirst()+"_"+pair.getSecond());
ViewLog viewLog = new ViewLog();
viewLog.setViewer(viewer);
viewLog.setViewed(viewed);
viewLog.setTime(time);
ViewLog viewLog2 = viewLogRepository.save(viewLog);
return true;
}
The problem I am facing is that I when for the first time I up my service the mongo collection that is created has the unique attribute for the fields 'viewer' and 'viewed' but for any subsequent collection that is created dynamically, the document does not have the unique constraint and multiple entries of same viewer-viewed combination are able to be inserted.
Any help will be very much appreciated.

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