If you want to set up a one-to-one relationship between two models, you'll need to add belongs_to to one, and has_one to the other. How do you know which is which?
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Answer / Nikul Singh
In a one-to-one relationship, `belongs_to` is used on the dependent model (the one that 'belongs to' another model). Conversely, `has_one` is used on the parent model (the one that 'has one' dependent model).
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