Question

我试图创建一个选择，但是我收到了这个错误：

ActionController :: ClassesController中的ParameterMissing #create

param丢失或值为空：class＃Never never trust parameters   从恐怖的互联网上，只允许通过白名单。

def class_params

params.require（：class）.permit（：classe，：segmento_id）

端

端

我试图创建一个选择，但同样的是返回此错误...如果它是一个简单的选择。我使用的是simple_form。

有人帮我吗？

我的表格：

    <%= simple_form_for(@class) do |f| %>
  <%= f.error_notification %>

  <div class="form-inputs">
    <%= f.input :classe %>
    <%= f.collection_select :segmento_id, Segmento.all, :id, :categoria, prompt: 'Selecione uma Categoria', input_html: { class:'form-control' } %>
  </div>

  <div class="form-actions">
    <%= f.button :submit %>
  </div>
<% end %>

我的控制器：

class ClassesController < ApplicationController
  before_action :set_class, only: [:show, :edit, :update, :destroy]


  # GET /classes
  # GET /classes.json
  def index
    @classes = Classe.all
  end

  # GET /classes/1
  # GET /classes/1.json
  def show
  end

  # GET /classes/new
  def new
    @class = Classe.new
  end

  # GET /classes/1/edit
  def edit
  end

  # POST /classes
  # POST /classes.json
  def create
    @class = Classe.new(class_params)

    respond_to do |format|
      if @class.save
        format.html { redirect_to @class, notice: 'Classe was successfully created.' }
        format.json { render :show, status: :created, location: @class }
      else
        format.html { render :new }
        format.json { render json: @class.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /classes/1
  # PATCH/PUT /classes/1.json
  def update
    respond_to do |format|
      if @class.update(class_params)
        format.html { redirect_to @class, notice: 'Classe was successfully updated.' }
        format.json { render :show, status: :ok, location: @class }
      else
        format.html { render :edit }
        format.json { render json: @class.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /classes/1
  # DELETE /classes/1.json
  def destroy
    @class.destroy
    respond_to do |format|
      format.html { redirect_to classes_url, notice: 'Classe was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def class_params
      params.require(:class).permit(:classe, :segmento_id)
    end

end

Answer 1

尝试将class重命名为class以外的其他内容。

事实上，尽量避免使用关键字作为字段，属性，方法，类名等。它会混淆语言运行时，框架和其他开发人员。

Answer 2

params.require（：classe）中有拼写错误

def class_params
   params.require(:classe).permit(:classe, :segmento_id)
end

Param丢失或值为空：class

2 个答案: