Question

我正在尝试向库存中的现有商品金额添加金额。

虽然它没有加起来，我做错了什么？

  def add_item_to_inventory (theItem, theAmount)
    @playerinventory = Playerinventory.find(params[:id])
    @item = Item.find(theItem)

    if !@item.nil?
      if !@playerinventory.item_for_inventories.find_by_item_id(theItem)
        @ifi = ItemForInventory.create(:item => @item, :amount => theAmount)
        @playerinventory.item_for_inventories << @ifi

      else
        oldAmount = @playerinventory.item_for_inventories.find_by_item_id(theItem).amount
        newAmount = oldAmount.to_i + theAmount.to_i

        @playerinventory.item_for_inventories.find_by_item_id(theItem).amount = newAmount
      end

      if @playerinventory.save 
        return true
      else
        return false
      end

    end

    false
  end

if部分就像一个魅力。 else没有

注意，theItem是item_id。显然，在我做@playerinventory.save

之后

Answer 1

item_for_inventories似乎是与playerInventory的关系，你在更新ItemForInventory后保存了playerInventory，你应该保存ItemForInventory或者可以更新它..像@playerinventory.item_for_inventories.find_by_item_id(theItem).update_attributes(amount: newAmount)

添加现有金额不起作用的金额

1 个答案: