Flexible Relationship

[Sam Walker]

This is what I currently have:

Alpha extends Model

@OneToMany

List<Child> children;

Bravo extends Model

@OneToMany

List<Child> children;

Child extends Model

// Either alpha or bravo will be specified

@ManyToOne

Alpha alpha;

@ManyToOne

Bravo bravo;

Can I do something like this?

Alpha implements HasChildren extends Model

@OneToMany

List<Child> children;

Bravo implements HasChildren extends Model

@OneToMany

List<Child> children;

Child extends Model

@Required

@ManyToOne

HasChildren parent; // Either Alpha or Bravo

[adrian10]

I usually do something like this:

Child extends Model

public Long parentId;

public String parentType;

parentId is the id of either Alpha or Bravo parent.

parentType is a String that can either be "Alpha" or "Bravo".

I skip the OneToMany, ManyToMany relationships. This works as long the child has only one parent.

And the child can have a lot of parent types.