Create Qr Code Entity

In this lesson, we'll create the QR code entity which represents a unique QR code associated with a ticket.

QR codes are a key part of our ticketing system, allowing for quick and reliable ticket validation at events.

Create the QR Code Entity

Here's the complete implementation of the QrCode class:

@Entity
@Table(name = "qr_codes")
@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class QrCode {

    @Id
    @Column(name = "id", nullable = false, updatable = false)
    @GeneratedValue(strategy = GenerationType.UUID)
    private UUID id;

    @Column(name = "status", nullable = false)
    @Enumerated(EnumType.STRING)
    private QrCodeStatusEnum status;

    @Column(name = "value", nullable = false)
    private String value;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "ticket_id")
    private Ticket ticket;

    @CreatedDate
    @Column(name = "created_at", updatable = false, nullable = false)
    private LocalDateTime createdAt;

    @LastModifiedDate
    @Column(name = "updated_at", nullable = false)
    private LocalDateTime updatedAt;
}

Updating the Ticket Entity

To complete the relationship between tickets and QR codes, we need to update the Ticket entity to include a reference to its QR codes:

@Entity
@Table(name = "tickets")
@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class Ticket {

    @Id
    @Column(name = "id", nullable = false, updatable = false)
    @GeneratedValue(strategy = GenerationType.UUID)
    private UUID id;

    @Column(name = "status", nullable = false)
    @Enumerated(EnumType.STRING)
    private TicketStatusEnum status;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "ticket_type_id")
    private TicketType ticketType;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "purchaser_id")
    private User purchaser;

    @OneToMany(mappedBy = "ticket", cascade = CascadeType.ALL)
    private List<TicketValidation> validations = new ArrayList<>();

    @OneToMany(mappedBy = "ticket", cascade = CascadeType.ALL)
    private List<QrCode> qrCodes = new ArrayList<>();

    @CreatedDate
    @Column(name = "created_at", updatable = false, nullable = false)
    private LocalDateTime createdAt;

    @LastModifiedDate
    @Column(name = "updated_at", nullable = false)
    private LocalDateTime updatedAt;

}

Summary

Created QrCode class to model a ticket's QrCode
Added qrCodes reference to the Ticket class