PARAM缺失或为空值：项

Question

items_controller.rb

class ItemsController < ApplicationController 

    def index 
    @items = Item.all 
    render text: @items.map{ |i| "#{i.name}: #{i.price}" }.join('<br/>') 
    end 

    def create 
    item_params = params.require(:item).permit(:name, :description, :price, :real, :weight) 
    @item = Item.create(item_params) 
    render text: "#{@item.id}: #{@item.name}(#{!@item.new_record?})" 
    end 

end 

错误：PARAM缺失或为空值：项

Rails.root：E：/ work/my_store_2

Application Trace |框架跟踪|全面跟踪 应用程序/控制器/ items_controller.rb：9：'创建”请求

参数：

{ “名”=> “CAR 1”， “说明”=> “好车”，“价格“=>” 500000" ， “重”=> “0”， “真实”=> “1”}

控制台

Started GET "/items/create?name=car1&description=good+car&price=500000&weight=0&real=1" for 127.0.0.1 at 2015-06-18 21:25:39 +0300 
Processing by ItemsController#create as HTML 
    Parameters: {"name"=>"car1", "description"=>"good car", "price"=>"500000", "weight"=>"0", "real"=>"1"} 
Completed 400 Bad Request in 2ms 

ActionController::ParameterMissing (param is missing or the value is empty: item): 
    app/controllers/items_controller.rb:9:in `create' 

哪里是我的错？

Answer 1

当你做params.require(:item)它需要item参数存在。所以，create行动期待这样的参数：{ "item" => {"name"=>"car1", "description"=>"good car", "price"=>"500000", "weight"=>"0", "real"=>"1"} }

您错过了item根密钥。

Answer 2

您错过了表单上的“项目”。添加id =“item”的字段。