使用Depot教程“尝试调用私有方法”

如果可能的话,给出cart.rb的所有代码。也许您的add_product方法是在类似这样的私有方法下进行的。我知道这应该是评论,我想用例子来解释它,所以我把它粘贴在答案中。

 private
   def self.some_method
     #some code 
   end

   def add_product(product_id) 

注释中的代码如下所示

class Cart < ActiveRecord::Base 
  has_many :line_items, :dependent => :destroy 
end #this end is creating problem

  def add_product(product_id)
    current_item = line_items.where(:product_id => product_id).first 
    if current_item 
      current_item.quantity += 1 
    else 
      current_item = LineItem.new(:product_id=>product_id)
      line_items << current_item 
    end 
    current_item 
  end 

关闭类后添加方法。将类的结尾放在方法的结尾之后,我敢打赌它会起作用。

将cart.rb更改为

class Cart < ActiveRecord::Base 
  has_many :line_items, :dependent => :destroy 


  def add_product(product_id)
    current_item = line_items.where(:product_id => product_id).first 
    if current_item 
      current_item.quantity += 1 
    else 
      current_item = LineItem.new(:product_id=>product_id)
      line_items << current_item 
    end 
    current_item 
  end 

end #this end should after the end of class method