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I'd like to update all user preferences to a default value efficiently. The following works correctly but does not seem good enough:

Employer.find_each do |employer|
  employer.user_preferences.update_all(send_emails: employer.send_emails)
end

Any hints?

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  • Can you not hit the UserPreference object directly here, maybe UserPreference.where(...).update_all(...) Commented Apr 2, 2019 at 15:15

1 Answer 1

Reset to default
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I can't test it right now, but you could use joins:

UserPreference.joins(:employer).update_all('send_email = employers.send_emails')
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