Ruby嵌套表单

实际上，在保存它必须保存，但我收到错误，并试图找出我错误的错误。

请帮我解决这个错误。

提前致谢。

调节器

def new @fooditem = Fooditem.new 3.times { @fooditem.fooditemprices.build} end #Creating Food Items def create @fooditem = Fooditem.new(fooditem_params) if @fooditem.save flash[:success] = "Food item created successfully." redirect_to fooditems_path else render 'new' end end 

楷模）

 class Fooditem < ApplicationRecord has_many :fooditemprices, dependent: :destroy accepts_nested_attributes_for :fooditemprices, reject_if: lambda {|attributes| attributes['price'].blank?}, allow_destroy: true end class Fooditemprice < ApplicationRecord belongs_to :fooditem validates :size, presence: { message: "Size must exists." } validates :price, presence: { message: "Price must exists." } end 

表格数据

错误

fooditem must exist

Params收到了

 "fooditem"=>{"name"=>"Food Item Name", "bdescription"=>"Food Item description of brief", "ddescription"=>"Food Item description of detailed", "priority"=>"1", "foodtype_id"=>"1", "foodcategory_id"=>"1", "fooditemprices_attributes"=>{ "0"=>{"size"=>"Full", "price"=>"120", "weight"=>"200", "weight_in"=>"Grams"}, "1"=>{"size"=>"Full", "price"=>"80", "weight"=>"120", "weight_in"=>"Grams"}, "2"=>{"size"=>"Full", "price"=>"50", "weight"=>"60", "weight_in"=>"Grams"}}, "sku"=>"", "active"=>"1"}, "commit"=>"Create Food Item"} 

Answer 1

您正在使用Rails 5，因此默认belongs_to要求关联记录必须存在。

尝试在您的关联中添加inverse ，如下所示：

 class Fooditem < ApplicationRecord has_many :fooditemprices, dependent: :destroy, inverse_of: :fooditem end class Fooditemprice < ApplicationRecord belongs_to :fooditem, inverse_of: :fooditemprices end 

它应该工作。