我的应用程序 nil:NilClass 的未定义方法“保存”

Question

[在此处输入图片描述][1]

我不断收到此错误消息，但无法弄清楚这是为什么。我相信这是因为@resturant 为零。但我不明白为什么它是零。 'print or console log' 是否有响应，所以我可以看到问题是什么 [1]: https://i.stack.imgur.com/sHUrz.png

这是模型

    class Resturant < ApplicationRecord
    mount_uploader :image, ImageUploader
    serialize :image, JSON # If you use SQLite, add this line
    belongs_to :user, optional: true

    validates :name, :description, :location, :resturant, :glutenfree, :vegan, presence: true
    validates :description, length: {maximum: 1000, too_long: "%{count} characters is the maximum allowed"}

    validates :title, length: {maximum: 140, too_long: "%{count} characters is the maximum allowed"}
end

这里是控制器：

class Resturant < ApplicationRecord
    mount_uploader :image, ImageUploader
    serialize :image, JSON # If you use SQLite, add this line
    belongs_to :user, optional: true

    validates :name, :description, :location, :resturant, :glutenfree, :vegan, presence: true
    validates :description, length: {maximum: 1000, too_long: "%{count} characters is the maximum allowed"}

    validates :title, length: {maximum: 140, too_long: "%{count} characters is the maximum allowed"}

结束

# GET /resturants/new
def new
  @resturant = Resturant.new
end

# GET /resturants/1/edit
def edit
end

# POST /resturants or /resturants.json
def create
  @resturants = Resturant.new(resturant_params)

  respond_to do |format|
    
    if @resturant.save
      format.html { redirect_to resturant_url(@resturant), notice: "Resturant was successfully created." }
      format.json { render :show, status: :created, location: @resturant }
    else
      format.html { render :new, status: :unprocessable_entity }
      format.json { render json: @resturant.errors, status: :unprocessable_entity }
    end
  end
end

# PATCH/PUT /resturants/1 or /resturants/1.json
def update
  respond_to do |format|

    if @resturant.update(resturant_params)
      format.html { redirect_to resturant_url(@resturant), notice: "Resturant was successfully updated." }
      format.json { render :show, status: :ok, location: @resturant }
    else
      format.html { render :edit, status: :unprocessable_entity }
      format.json { render json: @resturant.errors, status: :unprocessable_entity }
    end
  end
end

# DELETE /resturants/1 or /resturants/1.json
def destroy
  @resturant.destroy

  respond_to do |format|
    format.html { redirect_to resturants_url, notice: "Resturant was successfully destroyed." }
    format.json { head :no_content }
  end
end

private
  # Use callbacks to share common setup or constraints between actions.
  def set_resturant
    @resturant = Resturant.find(params[:id])
  end

  # Only allow a list of trusted parameters through.
  def resturant_params
    params.require(:resturant).permit(:name, :genre, :description, :location, :glutenfree, :vegan, :image, :resturant)
  end

结束

Answer 1

你打错了。（通常需要第二组新鲜的眼睛才能看到这些。）
您在创建操作中不小心将 resturant 复数化，但后来使用了单数形式。

你有：

@resturants = Resturant.new(resturant_params)

改为：

@resturant = Resturant.new(resturant_params)

（在整个申请中，您还拼错了“Restaurant”。是否要修复此问题取决于您。我知道我自己由于一些愚蠢的原因而无法拼写那个。）

我的应用程序 nil:NilClass 的未定义方法“保存”

undefined method `save' for nil:NilClass for my app

ruby-on-rails