How to configure Ransack Rails Gem to add NULLS LAST to sort

问题

I would like Ransack to always add NULLS LAST which will put nulls last for the sort column.

Any way to do this?

I opened a github issue on this one: https://github.com/activerecord-hackery/ransack/issues/443

回答1:

The answer is found in the thread linked in the question above. Writing it here so its easier to find. Apparently you need to build the order string again and add Null Last to it.

This solved it for me (works on all columns):

@q.result.except(:order).order("#{@q.sorts.first.name} #{@q.sorts.first.dir} NULLS LAST")

However you need to exclude it when you don't have any sort parametre, so this is my final solution:

@q = Project.ransack(params[:q])
@fields = current_user.settings.default_project_fields
if @q.sorts.present?
  @result = @q.result.except(:order).order("#{@q.sorts.first.name} #{@q.sorts.first.dir} NULLS LAST")
else
  @result = @q.result
end

来源：https://stackoverflow.com/questions/26321628/how-to-configure-ransack-rails-gem-to-add-nulls-last-to-sort