package com.ankurm.hibernatedemo.association;

import jakarta.persistence.CascadeType;
import jakarta.persistence.Entity;
import jakarta.persistence.FetchType;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
import jakarta.persistence.OneToOne;
import jakarta.persistence.Table;

/**
 * Non-owning ("mappedBy") side of an optional {@code @OneToOne}. Docs: 12-association-mappings.md,
 * chapter "The @OneToOne lazy trap". Even though {@link #profile} is declared
 * {@code FetchType.LAZY}, Hibernate cannot build a proxy for it here without bytecode
 * enhancement: it does not hold the foreign key, so it cannot know whether a profile row
 * exists without querying. The result is an eager extra SELECT on every load of LazyUser.
 */
@Entity
@Table(name = "lazy_user")
public class LazyUser {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String username;

    @OneToOne(mappedBy = "user", fetch = FetchType.LAZY, cascade = CascadeType.ALL, optional = true)
    private LazyProfile profile;

    protected LazyUser() {
    }

    public LazyUser(String username) {
        this.username = username;
    }

    public Long getId() {
        return id;
    }

    public LazyProfile getProfile() {
        return profile;
    }

    public void setProfile(LazyProfile profile) {
        this.profile = profile;
    }
}