module Ransack::Configuration

See this feature: https://www.postgresql.org/docs/13/queries-order.html

end
c.postgres_fields_sort_option = :nulls_first # or e.g. :nulls_always_last
Ransack.configure do |c|

User may want to configure it like this:

whether nulls appear before or after non-null values in the sort ordering.
The `NULLS FIRST` and `NULLS LAST` options can be used to determine

def postgres_fields_sort_option=(setting)
  self.options[:postgres_fields_sort_option] = setting
end