我遇到了一系列困扰我的问题！一种 Rails 新手，所以我无法弄清楚这一点。
我的“问题”模型有一个名为“Answers_expected”的字段，我希望有两个选项，“一个”或“多个”，而不仅仅是普通的文本输入。
我的 Questions_controller.rb （相关行）：
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（相关行）：
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>
我的问题 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>
出于某种原因，在我的服务器上，undefined method“a”出现错误合并：String pointing to line<%= f.check_box :answers_expected, "a" %> in _form.html.erb, but it works when I changef.check_box tof.radio_button`; 为什么？
然而，即使使用radio_button，Answers Expected服务器上的显示也持续显示为零，尽管我点击了什么，我也不明白。
还写了规范，希望在这里为我指明正确的方向：
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
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
而我失败的规格：
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)>'
很困惑！这有点混淆了我对 Rails 的理解。
谢谢。
编辑：
将语法更改为<%= f.check_box :answers_expected, value: "a" %>，但显示页面上预期的答案仍显示为零？