I have two models, Computer and Ipv6Address Computer belongs_to Ipv6Address Ipv6Address has_one Computer Using

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Asked: June 11, 20262026-06-11T11:29:00+00:00 2026-06-11T11:29:00+00:00

I have two models, Computer and Ipv6Address

Computer belongs_to Ipv6Address
Ipv6Address has_one Computer

Using ActiveRecord, how can I find a list of all Ipv6Addresses where no Computer is associated with it?

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Editorial Team · Answer 1 · 2026-06-11T11:29:01+00:00

Editorial Team

ipv6address_id is foreign key in Computer table

and

id is PK of Ipv6Address_id table

ids=Computer.select('Ipv6Address_id')
Ipv6Address.select('*').where('id not in (?)',ids)

This may work

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