[Dbix-class] Difference between belongs_to and has_one

[Drew Taylor]

This morning I was doing some work on relationships and ran into this question:
What is the difference between belongs_to and has_one/might_have?

They seem VERY similar. AFAICT the fundamental difference is that with
belongs_to cascading delete is turned off, while with has_one
cascading delete is turned on by default. Is there any other
differences between these two?

Thanks,
Drew
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