Question

我创建了嵌套表单和this教程。对于新对象，一切正常，但如果我想查看编辑表单，我会收到此错误

未定义的局部变量或方法`roles_form＆＃39;对于＃＆lt;＃：0x007f7c48ff6ab0＆gt;

形式：

  = simple_form_for @match do |f|
    = f.error_notification
    = f.input :club_home
    = f.input :club_away
    = f.input :address
    = f.input :date
    = f.simple_fields_for :roles do |r|
      %h3.text-center Referees
      .duplicatable_nested_form
        = r.input :role_type, collection: ["Referee", "Time/Scorekeeper", "Assessor", "Head Referee"], include_blank: false
        = r.association :showcase, label_method: :name, value_method: :id, include_blank: false

        - if @match.new_record?
          = link_to 'Remove', '', :remote => true, :class => 'destroy_duplicate_nested_form'
        - else
          = link_to 'Remove', match_roles_path(@match, roles_form.object), :method => :delete, :remote => true, :class => 'destroy_duplicate_nested_form'
          = roles_form.input :id, as: :hidden

    = f.button :submit, class: "btn btn-primary btn-sm"
    = link_to 'Add Another Referee', '', :class => 'duplicate_nested_form'

匹配控制器：

class MatchesController < ApplicationController

  before_action :authenticate_user!, only: [:new, :create, :edit, :update, :destroy]
  before_action :authenticate_admin, only: [:new, :create, :edit, :update, :destroy]

  def index
    @matches = Match.all
    @matches_grid = initialize_grid(Match)
  end

  def show
    @match = Match.find(params[:id])
    @referees = @match.referees
    @scorekeeper = @match.scorekeepers
    @assessor = @match.assessors
  end

  def new
    @match = Match.new
    @match.roles.build
  end

  def create
    @match = Match.new(match_params)
    if @match.save
      flash[:success] = "Match created"
      redirect_to matches_path
    else
      render 'new'
    end
  end

  def edit
    @match = Match.find(params[:id])
    @match.roles.build
  end

  def update
    @match = Match.find(params[:id])
    if @match.update_attributes(match_params)
      flash[:success] = "Match updated"
      redirect_to @match
    else
      render 'edit'
    end
  end

  def destroy
    @match = Match.find(params[:id])
    @match.destroy
    flash[:success] = "Match destroyed"
    redirect_to matches_path
  end

  private

  def match_params
    params.require(:match).permit(:club_home, :club_away, :date, :address, roles_attributes: [ :id, :showcase_id, :role_type ])
  end

end

路线：

Rails.application.routes.draw do
  resources :matches do
    resources :roles, only: :destroy
  end
end

Answer 1

每当您在undefined local variable or method XYZ`中看到, it means that you are attempting to use a variable named XYZ'等错误时，该范围内不存在该错误。

在您的情况下，您尝试使用roles_form

= roles_form.input :id, as: :hidden

但它不存在。相反，您在以下行中命名了该变量r

= f.simple_fields_for :roles do |r|

您只想将roles_form的实例替换为r或将r更改为roles_form。

为什么我的嵌套表单失败了？

1 个答案: