Question

我正在尝试更新对象上的字段，然后尝试保存它。在将被调用的控制器中，代码就是这样。

ApplicationUser user = applicationUserRepository.findByVerificationCode(verificationCode);
if(user != null) {
    user.setVerified(true);//trying to change a value in a field
    applicationUserRepository.save(user);
    return new ResponseEntity<>(user,new HttpHeaders(),HttpStatus.OK);
}

当我尝试执行此代码时，出现此错误

E11000重复密钥错误索引：myapp.applicationUser。$ id 重复密钥：{：0};

我在ApplicationUser类中明确定义了ID。我的ApplicationUser类是这样的

public class ApplicationUser {
    @Id
    private long id;
    private String username;
    private String password;
    private String name;
    private String email;
    private String verificationCode;
    private boolean verified=false;

    private List<Company> boughtCompanies;

    public long getId() {
        return id;
    }

    public String getUsername() {
        return username;
    }

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

    public String getPassword() {
        return password;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

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

    public String getVerificationCode() {
        return verificationCode;
    }

    public void setVerificationCode(String verificationCode) {
        this.verificationCode = verificationCode;
    }

    public List<Company> getBoughtCompanies() {
        return boughtCompanies;
    }

    public void setBoughtCompanies(List<Company> boughtCompanies) {
        this.boughtCompanies = boughtCompanies;
    }

    public boolean isVerified() {
        return verified;
    }

    public void setVerified(boolean verified) {
        this.verified = verified;
    }       
}

我在这里做错了什么或应该如何处理？谢谢。

Answer 1

编辑： 将@Id字段设置为String。在mongo中将long值用作ID不好。就像M. Wajdi所说的那样，您需要将setter添加到id字段中。

我看到您正在执行文档更新，因此应使用applicationUserRepository.save（）而不是applicationUserRepository.insert（）。（实际上，我总是使用保存）。

说明：

插入总是尝试在数据库中引入新对象。首次创建ApplicationUser时，insert在数据库中创建对象并为其分配ID。但是，如果您阅读，更新并尝试再次插入它，Mongo将会理解您实际上是在尝试引入具有相同ID的新对象（而不是对该对象执行更新）。这就是为什么您会收到该异常（重复的密钥）的原因。

Answer 2

您尝试插入具有相同ID的现有用户函数插入，我认为您应该使用更新功能

进行更改

Answer 3

您没有使用ID的设置器，因此需要将其设置为自动增量

public class ApplicationUser {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    private String username;
    private String password;
    private String name;
    private String email;
    private String verificationCode;
    private boolean verified=false;

    private List<Company> boughtCompanies;

    public long getId() {
        return id;
    }

    public String getUsername() {
        return username;
    }

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

    public String getPassword() {
        return password;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

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

    public String getVerificationCode() {
        return verificationCode;
    }

    public void setVerificationCode(String verificationCode) {
        this.verificationCode = verificationCode;
    }

    public List<Company> getBoughtCompanies() {
        return boughtCompanies;
    }

    public void setBoughtCompanies(List<Company> boughtCompanies) {
        this.boughtCompanies = boughtCompanies;
    }

    public boolean isVerified() {
        return verified;
    }

    public void setVerified(boolean verified) {
        this.verified = verified;
    }       
}

Answer 4

在选择long（或其他任何原始类型）作为mongo @Id时，则必须迎合id的生成，否则每次它将提供long的默认值，即0

有关自动增量排序的信息，请参见Auto increment sequence in mongodb using java。

其他类型为String的@Id，mongo自动生成十六进制类型的默认ID，有关更多信息，请参考https://docs.mongodb.com/manual/reference/method/ObjectId/

尝试在MongoDB SpringBoot中更新对象的字段时出现重复键错误

4 个答案: