nil : NilClass에 대한 정의되지 않은 메소드`[] '이지만 기사가 게시되었습니다.

debugcn 에 게시 Dev

user6124553

기사를 작성하기 위해 양식을 작성했으며 제목, 날짜, 내용, 기본 이미지 필드와 다중 업로드를위한 특수 필드가 있습니다. 이미지는 Carrierwave로 업로드됩니다.

이 양식에서 작동하는 두 가지 다른 모델과 컨트롤러가 있습니다. progress 및 progress_attachments .

사진 갤러리를 만들기 위해 여러 이미지를 첨부하고 싶기 때문에 다른 컨트롤러를 만들었습니다 progress_attachment SSR 설명을 따랐습니다

양식을 제출할 때이 오류가 발생합니다.

NoMethodError in ProgressesController#create
    undefined method `[]' for nil:NilClass

기사가 게시되었지만 ... (레일스 콘솔에서 찾을 수 있으며 쇼로 돌아 가면)

나는 이것이 undefined method []진행 컨트롤러의 내 생성 방법에서 비롯된 것이라고 믿지만 무언가가 누락되어 무엇을 이해하지 못합니다 ... ??

progresses_controller.rb

class ProgressesController < ApplicationController

  def index
    @progresses = Progress.all
  end

  def show
    @progress = Progress.find(params[:id])
    @progress_attachments = @progress.progress_attachments.all
  end

  def new
     @progress = Progress.new
     @progress_attachment = @progress.progress_attachments.build
  end

  def create
     @progress = Progress.new(progress_params)

     respond_to do |format|
       if @progress.save
         params[:progress_attachments]['image'].each do |a|
            @progress_attachment = @progress.progress_attachments.create!(:image => a)
         end
         format.html { redirect_to progresses_path, notice: 'Progress was successfully created.' }
       else
         format.html { render action: 'new' }
       end
     end
   end

   def update
     respond_to do |format|
       if @progress.update(article_params)
         format.html { redirect_to @progress, notice: 'Article was successfully updated.' }
         format.json { render :show, status: :ok, location: @progress }
       else
         format.html { render :edit }
         format.json { render json: @progress.errors, status: :unprocessable_entity }
       end
     end
   end

   def destroy
     @progress.destroy
     respond_to do |format|
       format.html { redirect_to articles_url, notice: 'Article was successfully destroyed.' }
       format.json { head :no_content }
     end
   end
   private
     def progress_params
        params.require(:progress).permit(:title, :content, :date, :main_image, progress_attachments_attributes: [:id, :progress_id, :image])
     end

end

progress_attachments_controller.rb

class ProgressAttachmentsController < ApplicationController
  before_action :set_progress_attachment, only: [:show, :edit, :update, :destroy]

  def index
    @progress_attachments = ProgressAttachment.all
  end

  def new
    @progress_attachment = ProgressAttachment.new
  end

  def create
    @progress_attachment = ProgressAttachment.new(progress_attachment_params)
    @progress_attachment = @progress.progress_attachments.build
    respond_to do |format|
      if @progress_attachment.save
        format.html { redirect_to @progress_attachment, notice: 'Progress attachment was successfully created.' }
        format.json { render :show, status: :created, location: @progress_attachment }
      else
        format.html { render :new }
        format.json { render json: @progress_attachment.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @progress_attachment.update(progress_attachment_params)
        format.html { redirect_to @progress_attachment, notice: 'Progress attachment was successfully updated.' }
        format.json { render :show, status: :ok, location: @progress_attachment }
      else
        format.html { render :edit }
        format.json { render json: @progress_attachment.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @progress_attachment.destroy
    respond_to do |format|
      format.html { redirect_to progress_attachments_url, notice: 'Progress attachment was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private

    def set_progress_attachment
      @progress_attachment = ProgressAttachment.find(params[:id])
    end

    def progress_attachment_params
      params.require(:progress_attachment).permit(:progress_id, :image)
    end
end

views / progresses / new.html.slim의 양식

 = simple_form_for(@progress, html: { multipart: true} ) do |f|
   =f.input :title
   =f.input :date
   =f.input :content
   =f.input :main_image
   =f.simple_fields_for :progress_attachments do |f|
     =f.input_field :image, multiple: true, name: "progress_attachments_attributes[:image][]"
   =f.button :submit

여러 업로드 문제를 해결했기 때문에 양식을 편집했습니다.

models / progress_attachment.rb

class ProgressAttachment < ActiveRecord::Base
  mount_uploader :image, ImageUploader
  belongs_to :progress
  validates :image, presence: true
end

models / progress.rb

class Progress < ActiveRecord::Base
  default_scope ->{order(created_at: :DESC)}
  mount_uploader :main_image, MainImageUploader
  has_many :progress_attachments
  accepts_nested_attributes_for :progress_attachments

  validates :main_image,   presence: true
  validates :title,   presence: true
  validates :content,  presence: true
  validates :date,    presence: true
end

편집하다

이것은 내 실제 컨트롤러에 대한 내 비웃음입니다.

Started POST "/progresses" for ::1 at 2016-09-02 01:37:49 +0200
  ActiveRecord::SchemaMigration Load (0.1ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Processing by ProgressesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"KdZkIvo+lbmE8JPlMNOOFc2grNG6w9u4kuO3kII2erOG+iD3RXfqutdwzAxvMIQbVGAzHVGawcBMW+WJfgZ+uA==", "progress"=>{"title"=>"Hello", "date"=>"1st september 2016", "content"=>"bonjourbonjour", "main_image"=>#<ActionDispatch::Http::UploadedFile:0x007fede250ecb8 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160902-22001-1l0mkug.jpg>, @original_filename="12915103_10208497250246588_1486835977_o.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"progress[main_image]\"; filename=\"12915103_10208497250246588_1486835977_o.jpg\"\r\nContent-Type: image/jpeg\r\n">, "progress_attachments_attributes"=>{"0"=>{"image"=>#<ActionDispatch::Http::UploadedFile:0x007fede250eb78 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160902-22001-9k74to.jpg>, @original_filename="band.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"progress[progress_attachments_attributes][0][image]\"; filename=\"band.jpg\"\r\nContent-Type: image/jpeg\r\n">}}}, "commit"=>"Create Progress"}

From: /Users/nelly/Desktop/ROR/leschner_guitars/app/controllers/progresses_controller.rb @ line 20 ProgressesController#create:

19: def create
 => 20:   binding.pry
    21:    @progress = Progress.new(progress_params)
    22:
    23:    respond_to do |format|
    24:      if @progress.save
    25:        params[:progress_attachments]['image'].each do |a|
    26:           @progress_attachment = @progress.progress_attachments.create!(:image => a)
    27:        end
    28:
    29:        format.html { redirect_to progresses_path, notice: 'Progress was successfully created.' }
    30:      else
    31:        format.html { render action: 'new' }
    32:      end
    33:    end
    34:  end

[1] pry(#<ProgressesController>)> params
=> {"utf8"=>"✓",
 "authenticity_token"=>"KdZkIvo+lbmE8JPlMNOOFc2grNG6w9u4kuO3kII2erOG+iD3RXfqutdwzAxvMIQbVGAzHVGawcBMW+WJfgZ+uA==",
 "progress"=>
  {"title"=>"Hello",
   "date"=>"1st september 2016",
   "content"=>"bonjourbonjour",
   "main_image"=>
    #<ActionDispatch::Http::UploadedFile:0x007fede250ecb8
     @content_type="image/jpeg",
     @headers=
      "Content-Disposition: form-data; name=\"progress[main_image]\"; filename=\"12915103_10208497250246588_1486835977_o.jpg\"\r\nContent-Type: image/jpeg\r\n",
     @original_filename="12915103_10208497250246588_1486835977_o.jpg",
     @tempfile=#<File:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160902-22001-1l0mkug.jpg>>,
   "progress_attachments_attributes"=>
    {"0"=>
      {"image"=>
        #<ActionDispatch::Http::UploadedFile:0x007fede250eb78
         @content_type="image/jpeg",
         @headers=
          "Content-Disposition: form-data; name=\"progress[progress_attachments_attributes][0][image]\"; filename=\"band.jpg\"\r\nContent-Type: image/jpeg\r\n",
         @original_filename="band.jpg",
         @tempfile=#<File:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160902-22001-9k74to.jpg>>}}},
 "commit"=>"Create Progress",
 "controller"=>"progresses",
 "action"=>"create"}
[2] pry(#<ProgressesController>)>

SteveTurczyn이 제안한 것처럼 변경하면 다음과 같습니다.

Started POST "/progresses" for ::1 at 2016-09-02 01:49:14 +0200
Processing by ProgressesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"XevIqKvA6UhcmipGb/zu8wJ3ItCwA5EBjldLQhwyXj7yx4x9FImWSw8ada8wH+T9m7e9HFtai3lQ7xlb4AJaNQ==", "progress"=>{"title"=>"This is a title", "date"=>"Today !", "content"=>"That's a short content", "main_image"=>#<ActionDispatch::Http::UploadedFile:0x007fb00af89dc0 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160902-22410-13jb3ww.jpg>, @original_filename="band.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"progress[main_image]\"; filename=\"band.jpg\"\r\nContent-Type: image/jpeg\r\n">, "progress_attachments_attributes"=>{"0"=>{"image"=>#<ActionDispatch::Http::UploadedFile:0x007fb00af89c80 @tempfile=#<Tempfile:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160902-22410-6mze6c.jpg>, @original_filename="boss2.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"progress[progress_attachments_attributes][0][image]\"; filename=\"boss2.jpg\"\r\nContent-Type: image/jpeg\r\n">}}}, "commit"=>"Create Progress"}

From: /Users/nelly/Desktop/ROR/leschner_guitars/app/controllers/progresses_controller.rb @ line 20 ProgressesController#create:

    19: def create
 => 20: binding.pry
    21:    @progress = Progress.new(progress_params)
    22:
    23:    respond_to do |format|
    24:      if params[:progress_attachments]
    25:        params[:progress_attachments]['image'].each do |a|
    26:         @progress_attachment = @progress.progress_attachments.create!(:image => a)
    27:        end
    28:        format.html { redirect_to progresses_path, notice: 'Progress was successfully created.' }
    29:      else
    30:        format.html { render action: 'new' }
    31:      end
    32:    end
    33:  end

[1] pry(#<ProgressesController>)> params
=> {"utf8"=>"✓",
 "authenticity_token"=>"XevIqKvA6UhcmipGb/zu8wJ3ItCwA5EBjldLQhwyXj7yx4x9FImWSw8ada8wH+T9m7e9HFtai3lQ7xlb4AJaNQ==",
 "progress"=>
  {"title"=>"This is a title",
   "date"=>"Today !",
   "content"=>"That's a short content",
   "main_image"=>
    #<ActionDispatch::Http::UploadedFile:0x007fb00af89dc0
     @content_type="image/jpeg",
     @headers="Content-Disposition: form-data; name=\"progress[main_image]\"; filename=\"band.jpg\"\r\nContent-Type: image/jpeg\r\n",
     @original_filename="band.jpg",
     @tempfile=#<File:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160902-22410-13jb3ww.jpg>>,
   "progress_attachments_attributes"=>
    {"0"=>
      {"image"=>
        #<ActionDispatch::Http::UploadedFile:0x007fb00af89c80
         @content_type="image/jpeg",
         @headers="Content-Disposition: form-data; name=\"progress[progress_attachments_attributes][0][image]\"; filename=\"boss2.jpg\"\r\nContent-Type: image/jpeg\r\n",
         @original_filename="boss2.jpg",
         @tempfile=#<File:/var/folders/11/mdddnw8d0zd961bsfkq1cjy00000gn/T/RackMultipart20160902-22410-6mze6c.jpg>>}}},
 "commit"=>"Create Progress",
 "controller"=>"progresses",
 "action"=>"create"}

당신의 도움을 주셔서 감사합니다

아산

unless params[:progress_attachments].nil?
  params[:progress_attachments]['image'].each do |a|
    @progress_attachment = @progress.progress_attachments.create!(:image => a)
  end
end

이 기사는 인터넷에서 수집됩니다. 재 인쇄 할 때 출처를 알려주십시오.

침해가 발생한 경우 연락 주시기 바랍니다[email protected] 삭제

에서 수정2021-06-13

몇 마디 만하겠습니다

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