OneToOneField value must be a model instance, not a value?

[regtech]

Hello everyone!

I am a junior who is first using OneToOneField, I found that the value which is giving to the field only could be a instance of the related model, can't be a value of the field which is specifed by the "to_field" ( else django will raise excption ).

In the other word, "to_field" does not make effect, django performing OneToOneField use PK.

I feel incomprehension and it makes me trouble on working.

Thanks!

[Kuber Sodari]

From official documentation "to_field is the field on the related object that the relation is to. By default, Django uses the primary key of the related object. If you reference a different field, that field must have unique=True." May be read it once, you will get some clearance.

I didn't quite understand your use-case though. Can you explain it, which field are you using OneToOneField for and why?