Fetching Backlinks without requesting the data again

[sheoak]

When creating backlinks, the documentation (to my knowledge) doesn’t show a way to retrieve them immediately.
This question was asked in #583 but never replied, so I don’t want to bump an old discussion.

Considering the definitions below:

class IdCard(Document):
    ref: Indexed(str, unique=True)
    # Only one owner per id card
    owner: BackLink["Person"] | None = Field(original_field="id_card")

class Person(Document):    
    name: str
    parents: List[Link["Person"]] | None = None
    kids: List[BackLink["Person"]] | None = Field(original_field="parents") 

morticia = Person(name="Morticia")
gomez = Person(name="Gomez")
await morticia.insert()
await gomez.insert()

wednesday = Person(name="Wednesday", parents=[gomez, morticia])
await wednesday.insert()

The following does NOT work:

# If uncommented, AttributeError: 'BackLink' object has no attribute 'id'
# await morticia.fetch_all_links()
# AttributeError: 'BackLink' object has no attribute 'name'
print(morticia.kids[0].name)

This works:

result = await Person.find(Person.name == 'Morticia', fetch_links=True).first_or_none()
print(result.kids[0].name)

Is there a way to populate the backlink, similar to fetch_all_links with Link objects?

Thank you!