My Project is based on Spring boot + Neo4j .
I am trying to create a new Privilege node , but don't want to duplicate Privilege.
Now I have a UserRole node which is holds List<Privilege>. Now
I want that when I create a Privilege , it check first is another Privilege exists with same privilegeName property.
Below are my domain classes.
UserRole Class
#NodeEntity
public class UserRole {
public UserRole(User user, Role role) {
this.user = user;
this.role = role;
}
/**
For Jackson Parsing
**/
public UserRole() {
}
#GraphId
private Long id;
public UserRole(User user, Role role, Unit unit) {
this.user = user;
this.role = role;
this.unit = unit;
}
public long getId() {
return id;
}
#Relationship(type = HAS_USERROLE,direction = "OUTGOING")
User user;
public User getUser() {
return user;
}
#Relationship (type = HAS_ROLE_OF,direction = "OUTGOING")
Role role;
public Role getRole() {
return role;
}
#Relationship(type = "WORKS_IN",direction = "OUTGOING")
Unit unit;
public Unit getUnit() {
return unit;
}
public void setUnit(Unit unit) {
this.unit = unit;
}
#Relationship(type = "HAS_PRIVILEDGE", direction = "OUTGOING")
List<Priviledge> priviledgeList;
public List<Priviledge> getPriviledgeList() {
return priviledgeList;
}
public void setPriviledgeList(List<Priviledge> priviledgeList) {
this.priviledgeList = priviledgeList;
}
}
Privilege Class
#GraphId
Long id;
private String priviledge;
private String priviledgeOn;
private Long priviledgeOnId;
public Priviledge() {
}
public Priviledge(String priviledge, String priviledgeOn) {
this.priviledge = priviledge;
this.priviledgeOn = priviledgeOn;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getPriviledge() {
return priviledge;
}
public void setPriviledge(String priviledge) {
this.priviledge = priviledge;
}
public String getPriviledgeOn() {
return priviledgeOn;
}
public void setPriviledgeOn(String priviledgeOn) {
this.priviledgeOn = priviledgeOn;
}
public Long getPriviledgeOnId() {
return priviledgeOnId;
}
public void setPriviledgeOnId(Long priviledgeOnId) {
this.priviledgeOnId = priviledgeOnId;
}
}
I am Using GraphRepository to save Entities.
The only way to do this currently is to query for the Privilege existing first and then create it if not, or use it if it does. Also add a unique constraint to be safe.
In a future release, this use case will be supported.
Related
I can't delete the association in the courses_student table of course and student when trying to delete a course, even if I want to cascade delete it does not work for me since there is a foreign key in courses_student, I don't know what the problem is.
I have also tried to remove the association in the courses_student table doing a update.but nothing happened.
DAO
#Override
public boolean deleteCourse(int id) {
Session currentSession = entityManager.unwrap(Session.class);
Courses course = currentSession.load(Courses.class, id);
for(Student student : course.getEstudiantes()) {
course.removeStudent(student);
}
currentSession.delete(course);
if(course.getId() == null)
return true;
else
return false;
}
Courses entity
#Entity
#Table(name = "courses")
public class Courses {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="id")
private Integer id;
#Column
private String nombre;
#Column
private String descripcion;
#ManyToMany(mappedBy = "courses")
private Set<Student> Estudiantes = new HashSet<Student>();
public Courses() {
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getNombre() {
return nombre;
}
public void setNombre(String nombre) {
this.nombre = nombre;
}
public String getDescripcion() {
return descripcion;
}
public void setDescripcion(String descripcion) {
this.descripcion = descripcion;
}
public Set<Student> getEstudiantes() {
return Estudiantes;
}
public void setEstudiantes(Set<Student> estudiantes) {
Estudiantes = estudiantes;
}
public void removeStudent(Student student) {
this.Estudiantes.remove(student);
student.getCourses().remove(this);
}
}
Student entity
#Entity
#Table(name = "students")
public class Student {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="id")
private Integer id;
#Column
private String nombre;
#Column
private String apellido;
#Column
private String dni;
#ManyToMany(fetch=FetchType.LAZY,
cascade= {CascadeType.PERSIST, CascadeType.MERGE,
CascadeType.DETACH, CascadeType.REFRESH})
#JoinTable(
name="courses_students",
joinColumns=#JoinColumn(name="id_student"),
inverseJoinColumns=#JoinColumn(name="id_course")
)
private Set<Courses> courses = new HashSet<Courses>();
public Student() {
}
public Student(String nombre, String apellido, String dni) {
this.nombre = nombre;
this.apellido = apellido;
this.dni = dni;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getNombre() {
return nombre;
}
public void setNombre(String nombre) {
this.nombre = nombre;
}
public String getApellido() {
return apellido;
}
public void setApellido(String apellido) {
this.apellido = apellido;
}
public String getDni() {
return dni;
}
public void setDni(String dni) {
this.dni = dni;
}
public Set<Courses> getCourses() {
return courses;
}
public void setCourses(Set<Courses> courses) {
this.courses = courses;
}
}
EDIT:
apparently it works for me, trying to update since owner side.
#Override
public boolean deleteCourse(int id) {
Session currentSession = entityManager.unwrap(Session.class);
Courses course = currentSession.load(Courses.class, id);
for(Student student : course.getEstudiantes()) {
student.removeCourse(course);
}
currentSession.update(course);
if(course.getId() == null)
return true;
else
return false;
}
It seems to me that you are missing a cascade configuration of your #ManyToMany annotation on Courses which is actually the one you are updating / deleting. Try the following:
#ManyToMany(mappedBy = "courses", cascade = {CascadeType.PERSIST, CascadeType.MERGE})
private Set<Student> Estudiantes = new HashSet<Student>();
Also, given that you have a bi-directional relationship, you should also remove the Course from each Student courses property.
I faced with problem of null value in PK.
Here's an entity:
#Entity
#Table(name="space")
public class Space implements Serializable {
#Id
#GeneratedValue
#Column(nullable = false, unique = true)
private Long id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name="user_id")
private UserAccount user;
private String name;
private String description;
private Date createdTime;
private Date modifiedTime;
#OneToMany(mappedBy="space")
private Set<SpaceAccess> spaceAccesses = new HashSet<>();
public Set<SpaceAccess> getSpaceAccesses() {
return spaceAccesses;
}
public void setSpaceAccesses(Set<SpaceAccess> spaceAccesses) {
this.spaceAccesses = spaceAccesses;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Space() {}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public UserAccount getUser() {
return user;
}
public void setUser(UserAccount user) {
this.user = user;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getCreatedTime() {
return createdTime;
}
public void setCreatedTime(Date createdTime) {
this.createdTime = createdTime;
}
public Date getModifiedTime() {
return modifiedTime;
}
public void setModifiedTime(Date modifiedTime) {
this.modifiedTime = modifiedTime;
}
}
I wrote strategy to generate PK properly but I always get Null in id field when I create new instance of the Space:
Space space = new Space();
Here's content of the object:
What i should do to generate id of instance properly using hibernate/spring mechanisms?
application.properties:
spring.datasource.url="some_url"
spring.datasource.username=name
spring.datasource.password=password
spring.jpa.generate-ddl=true
P.S. I use spring-boot-starter-data-jpa with version: 2.3.4.RELEASE.
Use:
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
I have two entities User and Focus for which I must store a ranking such that a User can have a ranking for many Focus', and a Focus may have many users. To handle this I've followed https://www.baeldung.com/jpa-many-to-many part 3 whereby I have the 2 following classes:
#Entity(name = "UserBaseRatings")
public class Rating {
#EmbeddedId
RatingKey id;
#ManyToOne
#MapsId("userID")
#JoinColumn(name="userID")
private User user;
#ManyToOne
#MapsId("focusID")
#JoinColumn(name="focusID")
private Focus focus;
private BigDecimal baseRating;
protected Rating(){}
public Rating(User user, Focus focus, BigDecimal baseRating) {
this.user = user;
this.focus = focus;
this.baseRating = baseRating;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public Focus getFocus() {
return focus;
}
public void setFocus(Focus focus) {
this.focus = focus;
}
public BigDecimal getBaseRating() {
return baseRating;
}
public void setBaseRating(BigDecimal baseRating) {
this.baseRating = baseRating;
}
}
and
#Embeddable
public class RatingKey implements Serializable {
#Column(name="userID")
private Long userID;
#Column(name="focusID")
private Long focusID;
protected RatingKey(){}
public RatingKey(Long userID, Long focusID) {
this.userID = userID;
this.focusID = focusID;
}
public Long getUserID() {
return userID;
}
public void setUserID(Long userID) {
this.userID = userID;
}
public Long getFocusID() {
return focusID;
}
public void setFocusID(Long focusID) {
this.focusID = focusID;
}
#Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
RatingKey ratingKey = (RatingKey) o;
return Objects.equals(userID, ratingKey.userID) &&
Objects.equals(focusID, ratingKey.focusID);
}
#Override
public int hashCode() {
return Objects.hash(userID, focusID);
}
}
The table for UserBaseRatings has a default value of 1 for baseRating such that if a user does not have a rating on the current focus their rating should be 1. I'm running into a problem where if the user hasn't made a rating then the set of Rating's is empty instead of having a rating of 1 for each focus that exists.
User:
public class User {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private Long userID;
#Column(name = "userHashedPassword")
private String password;
#Column(name = "userName")
private String userName;
#Column(name = "userEmail")
private String email;
//probably being reset
#Transient
private List<String> groups = new LinkedList<>();
#ManyToMany
#JoinTable(name = "UserRoles",
joinColumns = #JoinColumn(
name = "userID"),
inverseJoinColumns = #JoinColumn(
name = "roleID"))
private Set<Role> roles = new HashSet<>();
#OneToMany(mappedBy = "user")
private Set<Rating> ratings;
protected User(){}
public User(String userHashedPassword, String userName, String email, Set<Role> roles){
this.password = userHashedPassword;
this.userName = userName;
this.email = email;
this.roles = roles;
}
public Long getUserId() {
return userID;
}
public void setId(Long userID) {
this.userID = userID;
}
public String getPassword(){
return password;
}
public void setPassword(String password){
this.password = password;
}
public String getUsername() {
return userName;
}
public void setUsername(String name) {
this.userName = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Set<Role> getRoles() {
return roles;
}
public void setRoles(Set<Role> roles) {
this.roles = roles;
}
public Set<Rating> getRatings() {
return ratings;
}
public void setRatings(Set<Rating> ratings) {
this.ratings = ratings;
}
}
Focus:
#Entity
public class Focus {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private Long focusID;
private String focusCategory;
private String focusName;
private String focusExplanation;
#OneToMany(mappedBy = "focus")
Set<Rating> ratings;
//image
protected Focus(){}
public Focus(String focusCategory, String focusName, String focusExplanation, Set<Rating> ratings){
this.focusCategory = focusCategory;
this.focusName = focusName;
this.focusExplanation = focusExplanation;
this.ratings = ratings;
}
public Long getFocusId() {
return focusID;
}
public void setFocusId(Long focusID) {
this.focusID = focusID;
}
public String getFocusCategory() {
return focusCategory;
}
public void setFocusCategory(String focusCategory) {
this.focusCategory = focusCategory;
}
public String getFocusName() {
return focusName;
}
public void setFocusName(String focusName) {
this.focusName = focusName;
}
public String getFocusExplanation() {
return focusExplanation;
}
public void setFocusExplanation(String focusExplanation) {
this.focusExplanation = focusExplanation;
}
public Set<Rating> getRatings() {
return ratings;
}
public void setRatings(Set<Rating> ratings) {
this.ratings = ratings;
}
}
What am I missing that will allow a User's Ratings to be populated with the default value for each Focus that exists in the database?
Edit: Added #PrePersist and #PreUpdate to the Rating entity:
#Entity(name = "UserBaseRatings")
public class Rating {
#EmbeddedId
RatingKey id;
#ManyToOne
#MapsId("userID")
#JoinColumn(name="userID")
private User user;
#ManyToOne
#MapsId("focusID")
#JoinColumn(name="focusID")
private Focus focus;
private BigDecimal baseRating;
protected Rating(){}
public Rating(User user, Focus focus, BigDecimal baseRating) {
this.user = user;
this.focus = focus;
this.baseRating = baseRating;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public Focus getFocus() {
return focus;
}
public void setFocus(Focus focus) {
this.focus = focus;
}
public BigDecimal getBaseRating() {
return baseRating;
}
public void setBaseRating(BigDecimal baseRating) {
this.baseRating = baseRating;
}
#PrePersist
public void prePersist() {
if(baseRating == null) {
baseRating = BigDecimal.ONE;
}
}
#PreUpdate
public void preUpdate() {
if(baseRating == null) {
baseRating = BigDecimal.ONE;
}
}
}
Changing spring.jpa.hibernate.ddl-auto= from none to update also made no difference.
If you use ORM all default values have to be explicitly declared. It can be done this way
#Entity(name = "UserBaseRatings")
public class Rating {
// ...
private BigDecimal baseRating = BigDecimal.ONE;
// ...
}
or use #PrePersist and #PreUpdate
#Entity(name = "UserBaseRatings")
public class Rating {
// ...
private BigDecimal baseRating;
// ...
#PrePersist
public void prePersist() {
if(baseRating == null) {
baseRating = BigDecimal.ONE;
}
}
#PreUpdate
public void preUpdate() {
if(baseRating == null) {
baseRating = BigDecimal.ONE;
}
}
}
I have two entities:
User.java
#Entity
#Data
#AllArgsConstructor
#NoArgsConstructor
#Builder
public class User implements UserDetails {
#Id
#GeneratedValue
Long id;
#NotBlank
String username;
#NotBlank
String password;
#ElementCollection
#Builder.Default
List<String> roles = new ArrayList<>();
#Override
public Collection<? extends GrantedAuthority> getAuthorities() {
return this.roles.stream().map(SimpleGrantedAuthority::new).collect(toList());
}
#Override
public String getUsername() {
return username;
}
#Override
public boolean isAccountNonExpired() {
return false;
}
#Override
public boolean isAccountNonLocked() {
return false;
}
#Override
public boolean isCredentialsNonExpired() {
return false;
}
#Override
public boolean isEnabled() {
return false;
}
}
Student.java
#Entity
#Data
public class Student {
#Id
String id;
String name;
String firstName;
#OneToOne
#JoinColumn(name = "user_id")
User user;
public void addUser(User user) {
this.user = user;
}
}
The StudentService should add a new Student, create a new User and add it to the Student
#Override
public boolean addStudent(StudentDTO student) {
if (!studentRepository.existsById(student.getId())) {
Student s = modelMapper.map(student, Student.class);
studentRepository.save(s);
String username = String.format("s%s", student.getId());
List<String> roles = Arrays.asList("ROLE_STUDENT");
User user = userService.createUser(username, roles);
userService.addUser(user);
s.addUser(user);
return true;
}
return false;
}
The User is being created by UserService
#Override
public User createUser(String username, List<String> roles) {
String password = RandomStringUtils.randomAlphanumeric(16);
User u = User.builder()
.username(username)
.password(encoder.encode(password))
.roles(roles)
.build();
if (addUser(u)) {
return u;
} else {
throw new UserAlreadyExistingException(username);
}
}
#Override
public boolean addUser(User user) {
boolean alreadyExists = userRepository.findByUsername(user.getUsername()).isPresent();
if (true) {
userRepository.save(user);
return true;
}
return false;
}
Despite the User and the Student are being added to my database, the user_id column in the student table is always set to null. I also checked if the User being added to the Student is properly initialized and filled with all the information but the transaction is committed.
user_id is set to null because you are not saving mapping to database.
Changed code with comments:
#Override
public boolean addStudent(StudentDTO student) {
if (!studentRepository.existsById(student.getId())) {
Student s = modelMapper.map(student, Student.class);
// don't save student here
String username = String.format("s%s", student.getId());
List<String> roles = Arrays.asList("ROLE_STUDENT");
User user = userService.createUser(username, roles);
userService.addUser(user);
s.addUser(user);
//save student here after adding user.
studentRepository.save(s)
return true;
}
return false;
}
I have follow Hibernate error:
"Could not determine type for: java.util.List, at table: user, for columns: [org.hibernate.mapping.Column(authorities)]"
What can cause a problem?
Also, is it possible use it without model role, and set return getAuthority role "USER" by default?
User model:
#Entity
#Table(name = "user")
public class User implements UserDetails {
private int id;
private String username;
private String password;
private List<Role> roles;
#Id
#GeneratedValue
#Column(name = "id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
#Basic
#Column(name = "username")
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
#Basic
#Column(name = "password")
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
#Override
public String getUsername() {
return this.username;
}
#Override
public boolean isAccountNonExpired() {
return true;
}
#Override
public boolean isAccountNonLocked() {
return true;
}
#Override
public boolean isCredentialsNonExpired() {
return true;
}
#Override
public boolean isEnabled() {
return true;
}
#Override
public List<Role> getAuthorities() {
return this.roles;
}
#OneToMany(mappedBy = "user")
public List<Role> getRoles() {
return this.roles;
}
public void setRoles(List<Role> roles) {
this.roles = roles;
}
}
Role model:
#Entity
#Table(name = "role")
public class Role implements GrantedAuthority {
private int id;
private User user;
private String role;
public Role() {
}
public Role(String role){
this.role = role;
}
#Id
#GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
#ManyToOne
#JoinColumn(name="user_id")
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
#Override
public String getAuthority() {
return this.role;
}
#Basic
#Column(name="role")
public String getRole(){
return this.role;
}
public void setRole(String role){
this.role = role;
}
}
I found solution myself. I set #Transient annotation to all method, which i don't want that it shouldn't be column in table.
You must replace all annotations for the attributes not to the getter methods.