rails 中排序问题

yuzizhang — Mon, 29 Jul 2024 19:09:13 +0800

第一个问题 ScenicArea.order("hot_spot desc").order("id asc") 生成的查询是 SELECT scenic_areas.* FROM scenic_areas ORDER BY hot_spot desc, id asc ScenicArea.order("hot_spot desc, id asc") 生成的查询是。SELECT scenic_areas.* FROM scenic_areas ORDER BY hot_spot desc, id asc 为什么是相同的连续调用 order 后面的不应该覆盖前面的吗

第二个问题 post"/scenic_area/list" do check_params_sign @scenic_areas = ScenicArea.publish if params[:city_id].present? @scenic_areas = ScenicArea.by_city_id(params[:city_id]) @distance = 5000 else @distance = 50 end if params[:order].present? && params[:order].to_s == 'hot' @scenic_areas = @scenic_areas.order("hot_spot desc") else @scenic_areas = @scenic_areas.order(:distance) end if (params[:latitude].present? and params[:longitude].present?) @scenic_areas = @scenic_areas.near([params[:latitude],params[:longitude]],@distance.to_i, units: :km) end @scenic_areas = @scenic_areas.paginate(:per_page=>per_page,:page=>page) present({"code": 0,"msg": "ok", "data": {"scenic_areas": @scenic_areas.collect{|c|c.as_json(false)},"current_page": page,"total_pages": @scenic_areas.total_pages}}) end 这样写返回的结果是我想要的按照热度排序的结果 post"/scenic_area/list" do check_params_sign @scenic_areas = ScenicArea.publish if params[:city_id].present? @scenic_areas = ScenicArea.by_city_id(params[:city_id]) @distance = 5000 else @distance = 50 end if (params[:latitude].present? and params[:longitude].present?) @scenic_areas = @scenic_areas.near([params[:latitude],params[:longitude]],@distance.to_i, units: :km) end if params[:order].present? && params[:order].to_s == 'hot' @scenic_areas = @scenic_areas.order("hot_spot desc") else @scenic_areas = @scenic_areas.order(:distance) end @scenic_areas = @scenic_areas.paginate(:per_page=>per_page,:page=>page) present({"code": 0,"msg": "ok", "data": {"scenic_areas": @scenic_areas.collect{|c|c.as_json(false)},"current_page": page,"total_pages": @scenic_areas.total_pages}}) end 这样把 order 排序放在后面反而不会按照热度排序返回的是按照距离排序的结果这两个问题都不是很清楚希望有懂的帮我解答一下

yuzizhang (张宇)

rails 中排序问题