Rails中的複選框 - 值選擇不顯示在'顯示'，未定義的方法`合併'爲「a」：字符串

Question

我有一組問題正在做我的頭！一種Rails newb，所以我很難解決這個問題。

我有一個名爲'Answers_expected'的'問題'模型的字段，我希望'One'或'Multiple'有兩個選項，而不僅僅是普通的文本輸入。

我Questions_controller.rb（相關線路）：

before_action :set_answers_expected 
    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.require(:question).permit(:title, :brief, :idea_id, :user_id, :answers_expected) 
end 

def set_answers_expected 
    @answers_expected = [ 
    "One", 
    "Multiple" 
    ] 
end 

Questions.rb（相關線）：

validates :answers_expected, presence: true

_form.html.erb：

<%= form_for(@question) do |f| %> 
    <% if @question.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@question.errors.count, "error") %> prohibited this question from being saved:</h2> 

     <ul> 
     <% @question.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

    <div class="field form-group"> 
    <%= f.label :title, "Question" %><br> 
    <%= f.text_area :title, class:"form-control" %> 
    </div> 
    <div class="field form-group"> 
    <%= f.label :brief, "Description" %><br> 
    <%= f.text_area :brief, class:"form-control" %> 
    </div> 
    <div class="field form-group"> 
    <%= f.label :answers_expected %><br> 
     <% @answers_expected.each do |a| %> 
      <%= f.label :a, class: 'checkbox' do %> 
      <%= f.check_box :answers_expected, "a" %> 
      <%= a %> 
      <% end %> 
     <% end %> 
    </div> 

我的問題show.html.erb：

div class="question"> 
    <p> 
    <strong>Question:</strong> 
    <%= @question.title %> 
    </p> 
    <p> 
    <strong>Brief:</strong> 
    <%= @question.brief %> 
    </p> 
    <p> 
    <strong>Answers expected:</strong> 
    <%= @question.answers_expected %> 
    </p> 

對於我的服務器上的一些原因，我得到 「A」 的錯誤undefined method合併」：字符串pointing to line <％= f.check_box：answers_expected， 「A」 ％>in _form.html.erb, but it works when I change f.check_box to f.radio_button` ;爲什麼？

即使使用radio_button，但是，服務器上的Answers Expected顯示不斷顯示爲零，儘管我單擊了它，但我也不明白。

還寫規格希望能指出我朝着正確的方向：

question_spec.rb：

scenario 'with valid params' do 
    click_link 'Create a question' 
    fill_in 'Question', with: 'Valid question' 
    fill_in 'Description', with: 'This is valid description for the question.' 
    check 'One' 
    click_button 'Create Question' 
    page.should have_content 'One' 
    expect(page).to have_content('Question was successfully created.') 
end 

隨着我session_helper.rb有：

def submit_question(title = 'valid title', brief = 'valid brief') 
    click_link 'Create a question' 
    fill_in 'Question', with: title 
    fill_in 'Description', with: brief 
    check 'One' 
    click_button 'Create Question' 
end 

而我的失敗規格：

1) Visitor submits a question with valid params 
Failure/Error: page.should have_content 'One' 
    expected to find text "One" in "Toggle navigation Labthi.ng Home Explore Recent Activity Example User Sign out × Question was successfully created. 0 Title: Valid Title Phase: 1 Brief: Valid brief for an idea Image: Active: true Components: App Categories: Other User: Example User Direct Define Reputation Activity Question was successfully created. Question: Valid question Brief: This is valid description for the question. Answers expected: 0 Idea: Valid brief for an idea User: Example User No comments. Add comment No answers yet. Why don't you add one ? Add answer Edit | Back" 
# ./spec/features/question_spec.rb:16:in `block (2 levels) in <top (required)>' 

非常困惑！這與我對Rails的理解有點混亂。

謝謝。

編輯：

改變了語法​​，但預期顯示頁面上的答案仍然顯示爲零？

Answer 1

設定值與該check_box形式幫手正確的方法是：

<%= f.check_box :answers, {}, "a" %>

:answers是字段名
{}是你會把HTML屬性，如class和id
"a"將是值:)