JPA OneToOne relation doesnt persist child entity when saving parent-CodePudding

I'm having problems with automatically persisting my child entity when persisting the parent. I have followed guides etc but can't seem to find where I'm making a mistake.

I have the following entities:

@Entity
@Table(name = "mp_item")
public class Item {

@BatchFetch(value = BatchFetchType.JOIN)
@OneToOne(fetch = FetchType.LAZY, mappedBy = "item", cascade = CascadeType.ALL)
private ItemGroupSuggestion itemGroupSuggestion; 
}

Child:

 @Entity
@Table(name = "mp_itemgroup_suggestion")
public class ItemGroupSuggestion  {

@OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@JoinColumn(name = "item_id")
private Item item;

When creating a suggestion I am setting the reference to the parent, and in the parent the reference to the child, like this:

ItemGroupSuggestion suggestion = new ItemGroupSuggestion(item, itemgroups, nearestItem);
// sets this.item = item inside constructor of ItemGroupSuggestion
item.setItemGroupSuggestion(suggestion);

After setting the references, I do a batch-save:

itemService.saveAll(items);

Why are the children not getting persisted?

CodePudding user response：

Your setter in item should be as follows:

public void setItemGroupSuggestion(ItemGroupSuggestion itemGroupSuggestion) {
    itemGroupSuggestion.setItem(this);
    this.itemGroupSuggestion = itemGroupSuggestion;
}

CodePudding user response：

Seems like I finally got it to work, for some reason when I provided the referencedColumnName it started working. I thought that would be the default, but apparently not.

@JoinColumn(name = "item_id", referencedColumnName = "id")
private Item item;

If anyone knows why this was needed to get things working, please let me know.