Sorry to ask a sort of newbie SQL question but I'm having a hard time 
remembering how to do this and translating it into Sequel:

If I have to models like this:

class Apartment < Sequel::Model
  one_to_many :residents
end


class Resident < Sequel::Model
  many_to_one :apartment
end



How can I query all apartments ordered by resident count? I thought that 
this might work...

result = Apartment.eager_graph(:residents).order(:residents__count).all


...but that fails with a PG grouping error: "Sequel::DatabaseError: 
PG::GroupingError: ERROR:  column "apartments.id" must appear in the GROUP 
BY clause or be used in an aggregate function..."

Thanks for the help!

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