Rails保存數組以分隔數據庫中的行

Question

有人可以看看我的代碼，並讓我知道是否有更好的方法來做到這一點，或者甚至糾正我要錯誤的地方嗎？我正在嘗試爲每個場地和變體創建一個新的行。

例子：

venue_ids => ["1","2"], variant_ids=>["10"] 

所以，我希望在具有venue_id of 1添加一行，與variant_id of 10。和一個venue_id of 2，與variant_id of 10

我得到了這個工作，它現在傳入我的兩個數組。我認爲我幾乎在那裏我不確定.each是正確的方式，但我認爲我在正確的軌道上哈哈。但是，我提交了，我在哪裏可以放@back_bar.save？因爲這可能會導致問題，因爲它不會重定向

在此先感謝。

def create 
    @back_bar = BackBar.new 
    @venues = params[:venue_ids] 
    @productid = params[:product_id] 
    @variants = params[:variant_ids] 

    # For each venue we have in the array, grab the ID. 
    @venues.each do |v| 
    @back_bar.venue_id = v 
    # Then for each variant we associate the variant ID with that venue. 
    @variants.each do |pv| 
     @back_bar.product_variant_id = pv 

     # Add in our product_id 
     @back_bar.product_id = @productid 
     # Save the venue and variant to the DB. 

     if @back_bar.save 
     flash[:success] = "#{@back_bar.product.name} has been added to #{@back_bar.venue.name}'s back bar." 
     # Redirect to the back bar page 
     redirect_to back_bars_path 
     else 
     flash[:alert] = "A selected variant for #{@back_bar.product.name} is already in #{@back_bar.venue.name}'s back bar." 
     # Redirect to the product page 
     redirect_to discoveries_product_path(@back_bar.product_id) 
     end 
    end # Variants end 
    end # Venues end 
end 

private 

    def back_bar_params 
    params.require(:back_bar).permit(:venue_id, 
            :product_id, 
            :product_variant_id) 
    end 

Answer 1

正如我在評論說

這是未經測試的代碼，並只是顯示你怎麼可能輕鬆做到。

class BackBar 

    def self.add_set(vanue_ids, variant_ids) 
    values = vanue_ids.map{|ven| 
     variant_ids.map{|var| 
     "(#{ven},#{var})" 
     } 
    }.flatten.join(",") 

    ActiveRecord::Base.connection.execute("INSERT INTO back_bars VALUES #{values}") 
    end 
end 

def create 
    # use in controller 
    BackBar.add_set(params[:venue_ids], params[:variant_ids]) 

    # ... 
end