I want to add a row if not found, update if it is found

The following code that is inserting new rows correctly if people isn't found. If people is found I want it to update existing row and also the import_id but the update isn't working. So basically if a new import contains the same data in people I want to just update import_id. people has name age.

    Person.transaction do
      people.flatten.each do |people|
        Person.create_with({ import_id: import.id, **people }).find_or_create_by(**people)
      end
    end