我有两张table：User和Wallet
User具有：idWallet具有：userId、walletName
现在，我想避免这样的用户不能有两个同名钱包。
我创建了一些东西，但它适用于所有用户，所以如果用户与id 1创建一个名为walletSaving的钱包没有人可以创建该名称的钱包，虽然我想避免，我想创建一些东西来检查用户与id 1是否已经有该名称的钱包。
到目前为止我有这个：

if (walletRepository.existsByWalletName(walletRequest.getWalletName())) {
        return ResponseEntity.badRequest().body(new MessageResponse("You already have wallet with that name, choose another!"));
    }

在一些帮助后，我尝试了这样的东西：

@PostMapping("/user/{user_id}/wallets")
public ResponseEntity<?> createWallet(@PathVariable(value = "user_id") Long user_id,
                                      @RequestBody Wallet walletRequest, User user) {

    if (walletRepository.existsByUserIdAndWalletName(user.getId(), walletRequest.getWalletName())) {
        return ResponseEntity.badRequest()
                .body(new MessageResponse("You already have wallet with that name, choose another!"));
    }

它仍在创建同名钱包。
只是为了提供更多信息。
x1米10英寸1x

@Entity
    @Table(name = "users",
       uniqueConstraints = {
           @UniqueConstraint(columnNames = "username"),
           @UniqueConstraint(columnNames = "email")
       })
public class User {
  
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;

  @NotEmpty
  @Size(min = 3, max = 20)
  private String username;

  @NotEmpty
  @Size(max = 50)
  @Email
  private String email;

  @NotEmpty
  @Size(min = 6)
  private String password;

  @NotEmpty(message = "Please, insert a first name")
  private String firstName;

  @NotEmpty(message = "Please, insert a last name")
  private String lastName;

  @ManyToMany(fetch = FetchType.LAZY)
  @JoinTable(name = "user_roles", 
             joinColumns = @JoinColumn(name = "user_id"),
             inverseJoinColumns = @JoinColumn(name = "role_id"))
  private Set<Role> roles = new HashSet<>();

  public User() {
  }

  public User(String username, String email, String password, String firstName, String lastName) {
    this.username = username;
    this.email = email;
    this.password = password;
    this.firstName = firstName;
    this.lastName = lastName;
  }

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getEmail() {
    return email;
  }

  public void setEmail(String email) {
    this.email = email;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }

  public String getLastName() {
    return lastName;
  }

  public void setLastName(String lastName) {
    this.lastName = lastName;
  }

  public Set<Role> getRoles() {
    return roles;
  }

  public void setRoles(Set<Role> roles) {
    this.roles = roles;
  }
}

x1米11米1x

@Entity
    @Table(name = "wallet")
    public class Wallet {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @NotEmpty(message = "Please, insert a wallet name")
    private String walletName;

    private double initialBalance;

    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "user_id", nullable = false)
    @OnDelete(action = OnDeleteAction.CASCADE)
    @JsonIgnore
    private User user;

    public Wallet() {
    }

    public Wallet(String walletName, double initialBalance) {
        this.walletName = walletName;
        this.initialBalance = initialBalance;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getWalletName() {
        return walletName;
    }

    public void setWalletName(String walletName) {
        this.walletName = walletName;
    }

    public double getInitialBalance() {
        return initialBalance;
    }

    public void setInitialBalance(double initialBalance) {
        this.initialBalance = initialBalance;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }
}

Wallet Repository

boolean existsByUserIdAndWalletName(Long userId, String walletName);