CODEWITHSUNDEEP
springspring-bootspring-data-jpaone-to-one
abdallah alseddek
abdallah alseddek

Reputation: 9

Spring data jpa : One to one Relationship

I have Sensor Entity has Relationship to Location Entity

@RequiredArgsConstructor
@Data
public class TemperatureSensor {
    @Id
    @GeneratedValue(strategy = AUTO)
    private Long id;
    private float temperature;
    private float min;
    private float max;
    private float timeInterval;
    private boolean activityState;
    @OneToOne
    private Location location;
}

@Entity
@Data
@RequiredArgsConstructor
public class Location {
    @Id
    @GeneratedValue(strategy = AUTO)
    private Long id;
    private Long coordinates;
    private String name;
    private EnvironmentState environmentState = EnvironmentState.NORMAL_CASE;
    @OneToOne
    private TemperatureSensor temperatureSensor;
}

I created two endpoints to initiate each entity, so I send Sensor object using Postman like this and get location_id null in the database. The same is happening with Location.

    {
    "temperature" : "15.2",
    "min" :"9.0",
    "max" : "20.0", 
    "timeInterval" : "552.5", 
    "activityState" : "true",
    "location_id" :"1"
    }

Also, I tried to send location object and I got the exception: object references an unsaved transient instance - save the transient instance before flushing

{
    "temperature" : "15.2",
    "min" :"9.0",
    "max" : "20.0", 
    "timeInterval" : "552.5", 
    "activityState" : "true",
    "location" :{"coordinates": "123","name" : "loc01"}
    
}

Upvotes: 1

Views: 1345

Answers (1)

João Dias
João Dias

Reputation: 17460

The issue seems to be that you are missing cascade options on your @OneToOne annotations. Try using @OneToOne(cascade = CascadeType.ALL) instead (this will cascade all operations PERSIST, MERGE, REMOVE, REFRESH, DETACH to the other entity).

@RequiredArgsConstructor
@Data
public class TemperatureSensor {
    @Id
    @GeneratedValue(strategy = AUTO)
    private Long id;
    private float temperature;
    private float min;
    private float max;
    private float timeInterval;
    private boolean activityState;
    @OneToOne(cascade = CascadeType.ALL)
    private Location location;
}

Entity
@Data
@RequiredArgsConstructor
public class Location {
    @Id
    @GeneratedValue(strategy = AUTO)
    private Long id;
    private Long coordinates;
    private String name;
    private EnvironmentState environmentState = EnvironmentState.NORMAL_CASE;
    @OneToOne(cascade = CascadeType.ALL)
    private TemperatureSensor temperatureSensor;
}

Upvotes: 2

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