在 simple_form 中为 nil:NilClass 的 Rails 未定义方法“错误" [英] Rails undefined method `errors' for nil:NilClass in simple_form

问题描述

我正在使用 simple_form 并且我想在部分内部向用户显示错误.为此，我有一个非常简单的形式:

I'm using simple_form and I want to display errors to the user inside of partial. To do so I've got pretty simple form:

# test_result/shared/_form.html.erb
<%= simple_form_for :test_results, url: url  do |f| %>
  <%= f.error_notification %>
  <%= f.error_notification message: f.object.errors[:base].to_sentence if f.object.errors[:base].present? %>

  <% randomize_questions.each_with_index.map do |q, i| %>
    <%= f.input "[#{i}][answer]", collection: q[:answers].map.with_index { |a, i| [a, i.to_s] }, as: :radio_buttons %>
    <%= f.input "[#{i}][id]", as: :hidden, input_html: { value: q[:id] } %>
  <% end %>
  <%= f.button :submit, 'Submit' %>
<% end %>

它通过以下方式在 new.html.erb 内部呈现:

It's rendered inside of new.html.erb via:

  <%= render 'test_result/shared/form', url: test_step_one_path, randomize_questions: @randomize_questions  %>

控制器也很标准:

class TestBaseController < SignupBaseController
  before_action :randomize_questions, only: %i[new create]

  def new
    @test_result = TestResult.new
  end

  def create
    @test_result = current_user.test_results.new(
      answer: test_result_params,
    )

    if @test_result.save
      redirect_to next_step_path
    else
      render :new, status: :unprocessable_entity
    end
  end

private

  def test_result_params
    params.require(:test_results).permit(question_answer_params)
  end

  def question_answer_params
    (0..@randomize_questions.length).each_with_object({}) do |i, hash|
      hash[i.to_s] = %i[id answer question]
    end
  end

这是注册过程中的步骤之一.但是我无法使用此表单显示页面，因为出现以下错误:

This is one of the steps in the registration process. But I cannot display the page with this form because the below error shows up:

undefined method errors for nil:NilClass
Extracted source (around line #3):
              
1 <%= simple_form_for :appropriateness_test_results, url: url  do |f| %>
2  <%= f.error_notification %>
3  <%= f.error_notification message: f.object.errors[:base].to_sentence if f.object.errors[:base].present? %>

这意味着 f.object = nil - 我传递了什么错误吗?它应该是什么样子，以便我可以向用户显示错误?

Which means f.object = nil - did I passed something wrong? How should it look like so that I can display errors to the user?

我在控制器内部添加了 test_params.当用户没有选择任何内容时，question_answer_params 将产生以下哈希值:

I've added test_params inside of controller. The question_answer_params will produce below hash when the user does not select anything:

# question_answer_params output 
{"0"=>{"id"=>"21", "answer"=>""},
 "1"=>{"id"=>"22", "answer"=>""},
 "2"=>{"id"=>"23", "answer"=>""},
 "3"=>{"id"=>"18", "answer"=>""},
 "4"=>{"id"=>"19", "answer"=>""},
 "5"=>{"id"=>"20", "answer"=>""}}

推荐答案

我认为 render 应该是

I think render should be

  <%= render 'test_result/shared/form', url: test_step_one_path, randomize_questions: @randomize_questions, test_results: @test_result %>

或

形式应该像

<%= simple_form_for @test_result, url: url  do |f| %>
  <%= f.error_notification %>
  <%= f.error_notification message: f.object.errors[:base].to_sentence if f.object.errors[:base].present? %>

  <% randomize_questions.each_with_index.map do |q, i| %>
    <%= f.input "[#{i}][answer]", collection: q[:answers].map.with_index { |a, i| [a, i.to_s] }, as: :radio_buttons %>
  <% end %>
  <%= f.button :submit, 'Submit' %>
<% end %>

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