Error on creation only

[MohamedMaher5]

[phoenix-lib]

Hi i think your column category_id in ads table does not have a nullable criteria and when the record is created this column is empty.

Make that column NULLABLE and the problem goes away.

[MohamedMaher5]

I already select category from field and I don't want make category_id nullable

[norhan-elnezamy]

same issue with belongs to relation

[norhan-elnezamy]

After tracking the creation behavior in case of using belongs to relation you should enable nullable option for your relationship foreign key as it's attached after the model creation.