ActionController :: ParameterMissing不知道什麼是錯的

Question

我一直得到這個錯誤，我沒有在一段時間內使用紅寶石，所以我真的不知道如何解決它。

param is missing or the value is empty: sch 

Extracted source (around line #72): 
70 
71 
72 
73 
74 

    # Never trust parameters from the scary internet, only allow the white list through. 
    def sch_params 
     params.require(:sch).permit(:date, :time, :user_id) 
    end 
end 

Rails.root: C:/Sites/web 

Application Trace | Framework Trace | Full Trace 
app/controllers/sches_controller.rb:72:in `sch_params' 
app/controllers/sches_controller.rb:27:in `create' 
Request 

Parameters: 

{"utf8"=>"✓", 
"authenticity_token"=>"cHq54V7aVCjeBz0udZAYjGiojgrqDANx/BS+oMQ+N+0=", 
"sche"=>{"date(1i)"=>"2014", 
"date(2i)"=>"4", 
"date(3i)"=>"21", 
"time(1i)"=>"2014", 
"time(2i)"=>"4", 
"time(3i)"=>"21", 
"time(4i)"=>"17", 
"time(5i)"=>"37", 
"user"=>"steve"}, 
"commit"=>"Create Sche"} 

這是我的控制器

class SchesController < ApplicationController 
    before_action :set_sch, only: [:show, :edit, :update, :destroy] 

    # GET /sches 
    # GET /sches.json 
    def index 
    @sches = Sche.all 
    end 

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

    # GET /sches/new 
    def new 
    @sch = Sche.new 
    end 

    # GET /sches/1/edit 
    def edit 
    end 

    # POST /sches 
    # POST /sches.json 
    def create 
    @sch = Sche.new(sch_params) 

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

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

    # DELETE /sches/1 
    # DELETE /sches/1.json 
    def destroy 
    @sch.destroy 
    respond_to do |format| 
     format.html { redirect_to sches_url } 
     format.json { head :no_content } 
    end 
    end 

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

    # Never trust parameters from the scary internet, only allow the white list through. 
    def sch_params 
     params.require(:sch).permit(:date, :time, :user) 
    end 
end 

我真的不知道怎麼回事，我已經試過googleing的問題，但我還沒有找到答案 任何幫助，將不勝感激感謝

Answer 1

使用此：

def sch_params 
     params.require(:sche).permit(:date, :time, :user) 
    end 

你的控制器名稱爲SchesController所以在params散列你正在得到密鑰sche而不是sch。

如果看一下產生的參數，可以注意到sche

「血清膽鹼酯酶」 => { 「日期（1i）中」=> 「2014」， 「日期（2I）」=>「4 （3i）「=>」21「， 」時間（1i）「=>」2014「，」時間（2i）「=>」4「，」時間（3i）「=>」21「 ， 「時間（4i）」=>「17」，「時間（5i）」=>「37」，「用戶」=>「史蒂夫」}