Question

我正在尝试创建一个方法，但是出现错误：

undefined local variable or method 'product_params'

我不明白问题是什么。

class ProductsController < ApplicationController
  before_action :set_product, only: %i[show]


  def new
    @product = Product.new
  end

  def create
    @product = Product.new(product_params)
    respond_to do |format|
    if @product.save
        format.html { redirect_to @product, notice: 'Product was successfully created.' }
        format.json { render :show, status: :created, location: @product }
      else
        format.html { render :new }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
  end

  private
  def set_product
    @product = Product.find(params[:id])
  end

  def product_params
    params.require(:product).permit(:title, :description)
  end
end
end

我的参数是：

Parameters: {"authenticity_token"=>"eupRBo6LO4xQbJfBSDJOC6SOesNJ0GMeBMZRHijgvXvx4pn6Lw2jeIVCQ+XjqaDl8g6Dck1WsOYMiSMa8s4UMQ==", "product"=>{"title"=>"test_title", "description"=>"test_description"}, "commit"=>"Submit"}

Answer 1

问题是respond_to块的结尾缩进到create函数的结尾，而实际上所有私有函数都在create函数之内。更改代码，使其看起来像这样：

class ProductsController < ApplicationController
  before_action :set_product, only: %i[show]

  def new
    @product = Product.new
  end

  def create
    @product = Product.new(product_params)
    respond_to do |format|
      if @product.save
        format.html { redirect_to @product, notice: 'Product was successfully created.' }
        format.json { render :show, status: :created, location: @product }
      else
        format.html { render :new }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
    end
  end

  private
  def set_product
    @product = Product.find(params[:id])
  end

  def product_params
    params.require(:product).permit(:title, :description)
  end
end

如何将参数传递给方法创建

1 个答案: