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这是我写的csv创建函数order.rb 

  def self.to_csv(column_names)
    CSV.generate do |csv|
      csv << column_names
      all.each do |order|
        csv << order.attributes.values_at(*column_names)
      end
    end
  end

我在控制器中写了以下内容，即在orders控制器中。

def csv_downloader
    start_date=params[:class_start_date]
    end_date=params[:class_end_date]
    if start_date.to_date<=end_date.to_date
    respond_to do |format|
      if params[:data]="orders_customs_display"
        column_names=["created_at","order_legacy_id","clip_category_id","duration_id","quality_id","delivery_time_id","clip_status","total","perf_cut","c4u_cut"]
        format.csv { send_data Order.customs_not_refunded.where("created_at BETWEEN ? AND ?",start_date.to_date,end_date.to_date).select("created_at","order_legacy_id","clip_category_id","duration_id","quality_id","delivery_time_id","clip_status","total","perf_cut","c4u_cut").to_csv(column_names) }
        elsif params[:data]="orders_customs_refunded"
        column_names=["created_at","order_legacy_id","performer_id","clip_category_id","duration_id","quality_id","delivery_time_id","total"]  
        format.csv { send_data Order.customs_refunded.where("created_at BETWEEN ? AND ?",start_date.to_date,end_date.to_date).select("created_at","order_legacy_id","performer_id","clip_category_id","duration_id","quality_id","delivery_time_id","total").to_csv(column_names) }
        elsif params[:data]="orders_white_label_display"
        column_names=["created_at","orderrder_legacy_id","clip_category_id","duration_id","quality_id","delivery_time_id","clip_status","total","perf_cut","c4u_cut"]
        format.csv { send_data Order.white_label_not_refunded.where("created_at BETWEEN ? AND ?",start_date.to_date,end_date.to_date).to_csv }
        elsif params[:data]="orders_white_label_refunded"
        format.csv { send_data Order.white_label_refunded.where("created_at BETWEEN ? AND ?",start_date.to_date,end_date.to_date).to_csv }
        elsif params[:data]="orders_affiliate_display"
        format.csv { send_data Order.affiliate_not_refunded.where("created_at BETWEEN ? AND ?",start_date.to_date,end_date.to_date).to_csv }
        else
        format.csv { send_data Order.affiliate_refunded.where("created_at BETWEEN ? AND ?",start_date.to_date,end_date.to_date).to_csv }
      end
    end
    else
        redirect_to orders_path,:notice=>"Start date should be higher than end date or equal"
    end
  end

如您所见，此行选择表中我想要的列以及相应的列名并将它们打印到 csv 中。

column_names=["created_at","order_legacy_id","clip_category_id","duration_id","quality_id","delivery_time_id","clip_status","total","perf_cut","c4u_cut"]
format.csv { send_data Order.customs_not_refunded.where("created_at BETWEEN ? AND ?",start_date.to_date,end_date.to_date).select("created_at","order_legacy_id","clip_category_id","duration_id","quality_id","delivery_time_id","clip_status","total","perf_cut","c4u_cut").to_csv(column_names) }

现在的问题是我有 clip_category_id 它只是与订单表关联的列。我希望能够访问表中的列，然后name在clip_category表中打印它而不是单独打印 id。有没有办法做到这一点？

我尝试了以下

Order.customs_not_refunded.joins(:clip_category).where("created_at BETWEEN ? AND ?","1-10-2013".to_date,DateTime.now.to_date).select("created_at","order_legacy_id","name","duration_id","quality_id","delivery_time_id","clip_status","total","perf_cut","c4u_cut")

要得到以下错误：

Order Load (0.7ms)  SELECT created_at, order_legacy_id, name, duration_id, quality_id, delivery_time_id, clip_status, total, perf_cut, c4u_cut FROM "orders" INNER JOIN "clip_categories" ON "clip_categories"."id" = "orders"."clip_category_id" WHERE "orders"."payment_status" = 't' AND "orders"."refunded" = 'f' AND (created_at BETWEEN '2013-10-01' AND '2013-11-12') ORDER BY created_at DESC
SQLite3::SQLException: ambiguous column name: created_at: SELECT created_at, order_legacy_id, name, duration_id, quality_id, delivery_time_id, clip_status, total, perf_cut, c4u_cut FROM "orders" INNER JOIN "clip_categories" ON "clip_categories"."id" = "orders"."clip_category_id" WHERE "orders"."payment_status" = 't' AND "orders"."refunded" = 'f' AND (created_at BETWEEN '2013-10-01' AND '2013-11-12')  ORDER BY created_at DESC
ActiveRecord::StatementInvalid: SQLite3::SQLException: ambiguous column name: created_at: SELECT created_at, order_legacy_id, name, duration_id, quality_id, delivery_time_id, clip_status, total, perf_cut, c4u_cut FROM "orders" INNER JOIN "clip_categories" ON "clip_categories"."id" = "orders"."clip_category_id" WHERE "orders"."payment_status" = 't' AND "orders"."refunded" = 'f' AND (created_at BETWEEN '2013-10-01' AND '2013-11-12')  ORDER BY created_at DESC

我尝试了以下

Order.customs_not_refunded.joins(:clip_category).where("created_at BETWEEN ? AND ?","1-10-213".to_date,DateTime.now.to_date).select("orders.created_at")

并得到以下

    Order Load (98.6ms)  SELECT orders.created_at FROM "orders" INNER JOIN "clip_categories" ON "clip_categories"."id" = "orders"."clip_category_id" WHERE "orders"."payment_status" = 't' AND "orders"."refunded" = 'f' AND (created_at BETWEEN '0213-10-01' AND '2013-11-12') ORDER BY created_at DESC
SQLite3::SQLException: ambiguous column name: created_at: SELECT orders.created_at FROM "orders" INNER JOIN "clip_categories" ON "clip_categories"."id" = "orders"."clip_category_id" WHERE "orders"."payment_status" = 't' AND "orders"."refunded" = 'f' AND (created_at BETWEEN '0213-10-01' AND '2013-11-12')  ORDER BY created_at DESC
ActiveRecord::StatementInvalid: SQLite3::SQLException: ambiguous column name: created_at: SELECT orders.created_at FROM "orders" INNER JOIN "clip_categories" ON "clip_categories"."id" = "orders"."clip_category_id" WHERE "orders"."payment_status" = 't' AND "orders"."refunded" = 'f' AND (created_at BETWEEN '0213-10-01' AND '2013-11-12')  ORDER BY created_at DESC

更新 3

Order.customs_not_refunded.joins(:clip_category).where("orders.created_at BETWEEN ? AND ?","1-10-213".to_date,DateTime.now.to_date)

这工作没有错误。如何从两个表中单独获取特定的列。说created_at来自 order 的name列和来自 clip_category_id 的列

4

2 回答 2

0

我最终使用了这个

Order.customs_not_refunded.joins(:clip_category).joins(:delivery_time).joins(:quality).joins(:duration).where("orders.created_at BETWEEN ? AND ?","1-10-213".to_date,DateTime.now.to_date).select("orders.*,clip_categories.name AS category,qualities.name AS quality,durations.time AS duration,delivery_times.duration AS delivery_time")
于 2013-11-11T21:13:34.993 回答
0

created_at 在两个表中。在您的 where() 调用中，在 created_at 前面加上您要过滤的那个，例如 orders.created_at 或 clip_categories.created_at。

于 2013-11-11T20:05:35.937 回答