CODEWITHSUNDEEP
javahibernatejpa
stack overflow
stack overflow

Reputation: 31

Remove children of deleting the parent in many to one relation

Parent Class:

public class Article implements Serializable {

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

@Email
@NotNull
@Column(name = "email")
String email;

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

@Column(name = "published")
Boolean published;

@OneToMany(mappedBy = "article", cascade = {CascadeType.REMOVE},  orphanRemoval = true)
private Set<Comment> comments = new HashSet<>();

// setters and getters
}

Child Class:

public class Comment implements Serializable {

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

@Email
@NotNull
@Column(name = "email")
String email;

@JsonIgnore
@ManyToOne
@JoinColumn(name = "article_id", referencedColumnName = "id")
Article article;

// setters and getters
}

what i want to do is when deleting article for example with id = "1" it should delete all of its comments automatically ... so how to do that with annotations ?? in other words for example when make delete request on postman on http://localhost:8080/articles/1 where 1 is article id to delete ... it should delete all of its comments aswell

Upvotes: 0

Views: 551

Answers (2)

mkuligowski
mkuligowski

Reputation: 1604

Just Add OneToMany relation from Article to the Comment:

@OneToMany(mappedBy = "article", orphanRemoval = true)
private Set<Comment> comments = new HashSet<>();

Cascading REMOVE operations from the parent to the child require a relation from the parent to the child.

Update: Added orphanRemoval = true

Upvotes: 1

Moodi
Moodi

Reputation: 125

You shoud create other side of relationship is Article which is:

@OneToMany(cascade=CascadeType.All) @JoinColumn(name="article_id") List<Comment> comments

So with this relationship if you delete one Article all its comments will delete.

Upvotes: 1

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