Heroku spring-jpa UniqueConstraint

Question

我遇到了一个问题：在我的课程项目中，我使用spring-jpa并使用两个唯一字段创建UserEntity。在我的本地机器上，所有工作都很好（在db中创建了唯一的约束），但是在heroku上没有创建唯一的约束。我用的是java9 + spring-jpa。

import javax.persistence.*;

@Entity(name = "UserEntity")
@Table(name = "user_entity", uniqueConstraints = {
        @UniqueConstraint(columnNames = {"nickname"}, name = "nickname_constraint"),
        @UniqueConstraint(columnNames = {"email"}, name = "email_constraint")
})
public class UserEntity {
    private Integer id;
    private String nickname;
    private String email;
    private String passwordHash;
    private String avatarPath;
    private GameResults gameResults;

    public UserEntity() {
    }

    public UserEntity(String nickname, String email, String password) {
        this.nickname = nickname;
        this.email = email;
        this.passwordHash = password;
    }

    public UserEntity(String nickname, String password) {
        this.nickname = nickname;
        this.passwordHash = password;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    public Integer getId() {
        return id;
    }

    @Column(name = "nickname")
    public String getNickname() {
        return this.nickname;
    }

    @Column(name = "avatar_path")
    public String getAvatarPath() {
        return avatarPath;
    }

    @Column(name = "email")
    public String getEmail() {
        return email;
    }

    @Column(name = "password_hash")
    public String getPasswordHash() {
        return passwordHash;
    }

    @OneToOne(fetch = FetchType.LAZY)
    public GameResults getGameResults() {
        return gameResults;
    }
    // setters ommited
}