ruby-on-rails - 不允许的参数 : format

Question

我不明白为什么我会收到这些 Unpermitted parameter: format消息，我正在执行 JSON 请求:POST "/questions/add_options.json"使用这些参数 Parameters: {"id_question"=>551, "options"=>[{"position"=>10, "label"=>"opc 10", "value"=>"opc 10", "go_page"=>nil}], "question"=>{}}这就是我在终端中得到的......

Started POST "/questions/add_options.json" for 127.0.0.1 at 2016-08-16 23:12:27 -0300
Processing by QuestionsController#add_options as JSON
  Parameters: {"id_question"=>551, "options"=>[{"position"=>10, "label"=>"opc 10", "value"=>"opc 10", "go_page"=>nil}], "question"=>{}}
  User Load (0.4ms)  SELECT  "login_aexa".* FROM "login_aexa" WHERE "login_aexa"."usuaex_id" = $1  ORDER BY "login_aexa"."usuaex_id" ASC LIMIT 1  [["usuaex_id", 1]]
Unpermitted parameter: format
  Question Load (0.4ms)  SELECT  "questions".* FROM "questions" WHERE "questions"."id" = $1 LIMIT 1  [["id", 551]]
Unpermitted parameter: format
   (0.2ms)  BEGIN
   (0.4ms)  SELECT COUNT(*) FROM "options" WHERE "options"."question_id" = $1  [["question_id", 551]]

在 Rails Controller 中，我使用 params permit 拒绝不允许的参数，如下所示:

def question_add_options_params
  params.permit(:id_question, options: [:position, :label, :value, :go_page], question: {})
end

在我看来格式应该没问题，任何人都知道我为什么要得到这些 Unpermitted parameter: format消息？

编辑 :

这是 Controller 的代码

class QuestionsController < ApplicationController
  before_action :set_question, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_user!

  # GET /questions
  # GET /questions.json
  def index
    @questions = Question.all
  end

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

  # GET /questions/new
  def new
    @question = Question.new
  end

  # GET /questions/1/edit
  def edit
  end

  # POST /questions
  # POST /questions.json
  def create
    @question = Question.new(question_params)

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

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

  def add_options
    @question = Question.find(question_add_options_params[:id_question])

    question_add_options_params[:options].each do|q_aop|
      @question.options.create(q_aop)
    end

    @options = @question.options
  end

  # DELETE /questions/1
  # DELETE /questions/1.json
  def destroy
    @question.destroy
    respond_to do |format|
      format.html { redirect_to questions_url, notice: 'Question was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def question_params
      params[:question]
    end

    def question_add_options_params
      params.permit(:id_question, options: [:position, :label, :value, :go_page])
    end
end

Answer 1

params.permit(:id_question, options: [:position, :label, :value, :go_page], question: {})

这一行告诉 Rails 允许的唯一参数在上面的列表中。
如果您实际查看一个真正的 params-hash，它不仅包含表单传入的参数，还包含以下内容: :controller => :questions, :action => :create, :format => :json等等... Rails 总是根据 URL 插入

通常我们使用例如 form_for @question 来命名表单这意味着参数是这样输入的:

{:controller => :questions, :action => :create,
 :format => :json,
 :question => {"id_question"=>551, "options"=>[{"position"=>10, "label"=>"opc 10", "value"=>"opc 10", "go_page"=>nil}]}
}

那么你可以在你的 Controller 中做到这一点:

params.require(:question).permit(:id_question, options: [:position, :label, :value, :go_page])

这并没有从字面上告诉 rails 你不允许拥有总是由 rails 传入的 Controller / Action /格式参数......

显然，您需要修改它们的名称以满足您的需要，但这是您需要做的来阻止错误。