Spring Booot 2 JPA POST使用外键创建实体

Question

具有两个到另外两个表的外键的实体的POST / PUT请求正文是什么？

我试图通过httpie发送为：

http POST：8080 / api / tickets description =“从httpie创建” state_id = 1严重性ID = 1

但出现错误：

{
    "cause": {
        "cause": {
            "cause": null,
            "message": "Column 'severity_id' cannot be null"
        },
        "message": "could not execute statement"
    },
    "message": "could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement"
}

这是实体类和JpaRepository

@Data
@AllArgsConstructor
@NoArgsConstructor
@ExposeId
@Entity
@Table(name = "tickets")
public class Ticket {
    @Id
    @Column(name = "id")
    private long id;

    @Column(name = "description")
    private String description;

    @OneToOne
    @JoinColumn(name = "state_id")
    private State state;

    @OneToOne
    @JoinColumn(name = "severity_id")
    private Severity severity;
}

@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table(name = "states")
public class State {
    @Id
    @Column(name = "id")
    private long id;

    @Column(name = "name")
    private String name;

    @OneToOne(mappedBy = "state")
    private Ticket ticket;
}

@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table(name = "severities")
public class Severity {
    @Id
    @Column(name = "id")
    private long id;

    @Column(name = "name")
    private String name;

    @OneToOne(mappedBy = "severity")
    private Ticket ticket;
}


@CrossOrigin
@RepositoryRestResource(collectionResourceRel = "tickets",
                        path = "tickets")
public interface TicketRepository extends JpaRepository<Ticket, Long> {
}

这是数据库：

DROP TABLE IF EXISTS tickets,
                     states,
                     severities;

CREATE TABLE states (
    id int NOT NULL,
    name VARCHAR(10),
    PRIMARY KEY (id),
    UNIQUE KEY (name)
);


CREATE TABLE severities (
    id int NOT NULL,
    name VARCHAR(10),
    PRIMARY KEY (id),
    UNIQUE KEY (name)
);

CREATE TABLE tickets (
    id int auto_increment   NOT NULL,
    description VARCHAR(50) NOT NULL,
    state_id int            NOT NULL,
    severity_id int         NOT NULL,
    PRIMARY KEY (id),
    FOREIGN KEY (state_id)    REFERENCES states (id)     ON DELETE CASCADE,
    FOREIGN KEY (severity_id) REFERENCES severities (id) ON DELETE CASCADE
);

insert into states (id, name) VALUES(0, '');
insert into states (id, name) VALUES(1, 'Open');
insert into states (id, name) VALUES(2, 'Hold');
insert into states (id, name) VALUES(3, 'Cancel');
insert into states (id, name) VALUES(4, 'Close');

insert into severities (id, name) VALUES(0, '');
insert into severities (id, name) VALUES(1, 'Normal');
insert into severities (id, name) VALUES(2, 'Low');
insert into severities (id, name) VALUES(3, 'Medium');
insert into severities (id, name) VALUES(4, 'High');
insert into severities (id, name) VALUES(5, 'Critical');

insert into tickets (description, state_id, severity_id) VALUES("first ticket", 1, 1);
insert into tickets (description, state_id, severity_id) VALUES("second ticket", 4, 4);
insert into tickets (description, state_id, severity_id) VALUES("third ticket", 2, 2);