英文:
How do I list roles using ENUM?
问题
以下是您要翻译的内容：
// 用户控制器private UserRepository userRepository;public UserController(UserRepository userRepository) {this.userRepository = userRepository;}@PostMappingpublic String userPostAdd(@RequestBody User user) {List<Authority> rolesList = new ArrayList<>();for (Role role : user.getRole()){Authority r = role.getName();if (r != null){rolesList.add(r);}}if (!rolesList.isEmpty()){userRepository.save(user);}return "添加用户";}// 角色实体@ToString@Entity@Table(name = "role", schema = "task")public class Role {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private Long id;@Column(name = "name", nullable = false)@Enumerated(EnumType.STRING)private Authority name;@ManyToMany(fetch = FetchType.LAZY, mappedBy = "role")private List<User> users;// getter、setter...}// 用户实体@ToString@Entity@Table(name = "user", schema = "task")public class User {@Id@GeneratedValue(strategy= GenerationType.IDENTITY)@Column(name = "id")private Long id;@ManyToMany@JoinTable(name = "user_role",joinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"),inverseJoinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"))private List<Role> role;@OneToMany(mappedBy = "user")private Set<Contract> contract;@Column(name = "surname", nullable = false)private String surname;@Column(name = "name", nullable = false)private String name;@Column(name = "email", nullable = false, unique = true)private String email;@Column(name = "phone", nullable = false, unique = true)private Integer phone;// getter、setter...}// 枚举public enum Authority {TENANT ("tenant"),LANDLORD ("landlord"),ADMIN ("admin");private final String name;private Authority(String s) {name = s;}public boolean equalsName(String otherName) {return name.equals(otherName);}public String toString() {return this.name;}}
英文:
Example of a POST request that I will make to add a user: Vasya, Petrenko,910382741, vasya@mail.ru, ADMIN the first 4 attributes work, but I don't understand how to make a field for a role.
Is my database built correctly? I use Json to send a request to add a user, the user's relationship to the role is many to many. I don't understand how to send the role, I need another attribute in the user?
UserControllerprivate UserRepository userRepository;public UserController(UserRepository userRepository) {this.userRepository = userRepository;}@PostMappingpublic String userPostAdd(@RequestBody User user) {List<Authority> rolesList = new ArrayList<>();for (Role role : user.getRole()){Authority r = role.getName();if (r != null){rolesList.add(r);}}if (!rolesList.isEmpty()){userRepository.save(user);}return "Add user";}
Entity Role
@ToString@Entity@Table(name = "role", schema = "task")public class Role {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private Long id;@Column(name = "name", nullable = false)@Enumerated(EnumType.STRING)private Authority name;@ManyToMany(fetch = FetchType.LAZY, mappedBy = "role")private List<User> users;getter,setter...}
User:
@ToString@Entity@Table(name = "user", schema = "task")public class User {@Id@GeneratedValue(strategy= GenerationType.IDENTITY)@Column(name = "id")private Long id;@ManyToMany@JoinTable(name = "user_role",joinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"),inverseJoinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"))private List<Role> role;@OneToMany(mappedBy = "user")private Set<Contract> contract;@Column(name = "surname", nullable = false)private String surname;@Column(name = "name", nullable = false)private String name;@Column(name = "email", nullable = false, unique = true)private String email;@Column(name = "phone", nullable = false, unique = true)private Integer phone;getter,setter...}
Enum
public enum Authority {TENANT ("tenant"),LANDLORD ("landlord"),ADMIN ("admin");private final String name;private Authority(String s) {name = s;}public boolean equalsName(String otherName) {return name.equals(otherName);}public String toString() {return this.name;}}
答案1
得分: 1
问题在于你将 roles = null，然后对其进行方法调用。你首先需要通过调用 valueOf 方法来获取角色对象。如果角色不存在，它应该是 null。以下代码应该可以工作。
@PostMappingpublic String userPostAdd(@ModelAttribute User user) {List<Roles> rolesList = new ArrayList<>();for (Role role : user.getRole()){Roles r = Roles.valueOf(role.getName().toUpperCase());if (r != null){rolesList.add(r);}}if (!rolesList.isEmpty()){userRepository.save(user);}return "Add user";}
英文:
The problem is that you're setting roles = null and then make a method call on it. You first need to fetch the role object by calling valueOf. If the role does not exist it should be null. The following should work.
@PostMappingpublic String userPostAdd(@ModelAttribute User user) {List<Roles> rolesList = new ArrayList<>();for (Role role : user.getRole()){Roles r = Roles.valueOf(role.getName().toUpperCase());if (r != null){rolesList.add(r)}}if (!rolesList.isEmpty()){userRepository.save(user);}return "Add user";}
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