Ruby on Rails 自动变量名称（复数与单数）

Question

我正在构建一个 Rails 应用程序，其中包含多个结构完全相同的测验：

• 诸如@quiz_bf 或@quiz_bs 之类的名称
• new.html.erb 和 edit.html.erb 每个测验的观看次数
• 部分_quiz.html.erb 存储每个测验的实际测验问题
• 每个独立测验的模型和控制器
• 两个地方（主导航和用户个人资料页面）保存指向new 视图的链接（如果人们已经参加了测验，则指向edit 视图，由 erb if/else 语句决定）每个测验

我成功地设置了第一个测验，但由于我是 Ruby 新手，我犯了一个（可怕的）错误，即为测验的单数版本设置了一个以 -s (quiz_bs) 结尾的变量名.这对 Ruby 的单数和复数命名约定造成了严重破坏。

我目前已经设置了我的第二个测验 (quiz_bf) 的代码，但是在我的控制器中的新测验的定义上出现了一个无方法错误 undefined method 'quiz_bfs' for #<User:0x007fb9a3247f98>。

这是我的控制器：

class QuizBfController < ApplicationController
before_action :require_sign_in

def show
  @quiz_bf = QuizBf.find(params[:id])
end

def new
  @quiz_bf = current_user.quiz_bfs || current_user.build_quiz_bfs
end

def create
  @quiz_bf = QuizBf.new

  @quiz_bf.bf01 = params[:quiz_bfs][:bf01]
  @quiz_bf.bf02 = params[:quiz_bfs][:bf02]
  @quiz_bf.bf03 = params[:quiz_bfs][:bf03]
  @quiz_bf.bf04 = params[:quiz_bfs][:bf04]
  @quiz_bf.bf05 = params[:quiz_bfs][:bf05]
  @quiz_bf.bf06 = params[:quiz_bfs][:bf06]
  @quiz_bf.bf07 = params[:quiz_bfs][:bf07]
  @quiz_bf.bf08 = params[:quiz_bfs][:bf08]
  @quiz_bf.bf09 = params[:quiz_bfs][:bf09]
  @quiz_bf.bf10 = params[:quiz_bfs][:bf10]

  @quiz_bf.user = current_user

  if @quiz_bf.save
    flash[:notice] = "Quiz results saved successfully."
    redirect_to user_path(current_user)
  else
    flash[:alert] = "Sorry, your quiz results failed to save."
    redirect_to welcome_index_path
  end
  end

  def edit
    @quiz_bf = QuizBf.find(params[:id])
  end

  def update
  @quiz_bf = QuizBf.find(params[:id])

  @quiz_bf.assign_attributes(quiz_bfs_params)

  if @quiz_bf.save
    flash[:notice] = "Post was updated successfully."
    redirect_to user_path(current_user)
    else
    flash.now[:alert] = "There was an error saving the post. Please try again."
    redirect_to welcome_index_path
    end
    end

    private
    def quiz_bfs_params
    params.require(:quiz_bfs).permit(:bf01, :bf02, :bf03, :bf04, :bf05, :bf06, :bf07, :bf08, :bf09, :bf10)
    end

    end

这是我的模型（用户has_one :quiz_bf）：

class QuizBf < ActiveRecord::Base
before_save :set_bfcode

def set_bfcode
  self.bfcode = "#{self.bf01}#{self.bf02}#{self.bf03}-#{self.bf04}#{self.bf05}#{self.bf06}-#{self.bf07}#{self.bf08}#{self.bf09}#{self.bf10}"
end

belongs_to :user
validates :user, presence: true
end

这是我的用户模型：

class User < ActiveRecord::Base
before_save { self.email = email.downcase }

validates :name, length: { minimum: 1, maximum: 100 }, presence: true
validates :password, presence: true, length: { minimum: 6 }, unless: :password_digest
validates :password, length: { minimum: 6 }, allow_blank: true
validates :email,
        presence: true,
        uniqueness: { case_sensitive: false },
        length: { minimum: 3, maximum: 254 }

has_secure_password

has_one :quiz_bs
has_one :quiz_bf

结束

以下是我的部分测验的相关部分：

<%= form_for @quiz_bf do |f| %>

...

<%= f.submit "Submit Answers" %>

这是我从new 视图链接的方式：

<%= render partial: "quiz", locals: { url: quiz_bfs_path, method: :post } %>

还有我的edit 观点：

<%= render "quiz", url: quiz_bf_path(@quiz_bf), method: :put  %>

（最后）这是我从application 视图链接到它的方式：

          <% if current_user.quiz_bfs == nil? %>
             <%= link_to "Body Flexibility Quiz", quiz_bf_path %>
          <% else %>
             <%= link_to "Body Flexibility Quiz ✓", edit_quiz_bf_path(current_user.quiz_bfs) %>
          <% end %>

还有我的用户show页面：

  <% if @user.quiz_bfs == nil %>
    <p><%= link_to "Test Your Body Flexibility", new_quiz_bf_path %></p>
  <% else %>
    <h3><%= @user.quiz_bfs.bfcode %></h3>
    <p><%= link_to "Retest Results", edit_quiz_bf_path(@user.quiz_bfs) %></p>
  <% end %>

我知道这段代码在quiz_bs 上成功运行，但正如您在我的 rake 路由中看到的（如下所示），我愚蠢的变量名称的复数/单数问题使得很难看到实际命名为什么。谁能比我更有经验的红宝石眼睛告诉我我需要改变什么？

        quiz_bs GET    /quiz_bs(.:format)             quiz_bs#index
                POST   /quiz_bs(.:format)             quiz_bs#create
     new_quiz_b GET    /quiz_bs/new(.:format)         quiz_bs#new
    edit_quiz_b GET    /quiz_bs/:id/edit(.:format)    quiz_bs#edit
         quiz_b GET    /quiz_bs/:id(.:format)         quiz_bs#show
                PATCH  /quiz_bs/:id(.:format)         quiz_bs#update
                PUT    /quiz_bs/:id(.:format)         quiz_bs#update
                DELETE /quiz_bs/:id(.:format)         quiz_bs#destroy
  quiz_bf_index GET    /quiz_bf(.:format)             quiz_bf#index
                POST   /quiz_bf(.:format)             quiz_bf#create
    new_quiz_bf GET    /quiz_bf/new(.:format)         quiz_bf#new
   edit_quiz_bf GET    /quiz_bf/:id/edit(.:format)    quiz_bf#edit
        quiz_bf GET    /quiz_bf/:id(.:format)         quiz_bf#show
                PATCH  /quiz_bf/:id(.:format)         quiz_bf#update
                PUT    /quiz_bf/:id(.:format)         quiz_bf#update
                DELETE /quiz_bf/:id(.:format)         quiz_bf#destroy

Answer 1

未定义方法错误

未定义方法的问题可能与调用是复数调用（quiz_bfs）有关，它期望您有一个 has_many 关联，而您的模型只定义了一个 has_one 关联：

has_one :quiz_bs
has_one :quiz_bf

a）quiz_bfs 的使用是错字，应该是 quiz_bf，b）has_one 不正确，或者 c）您根本不需要调用 current_user.quiz_bfs 来为@quiz_bf。不知道更多细节很难说，但看起来你可以删除current_user.quiz_bfs。

路线奖励

虽然不是这个问题，但具体来说，您提到了以 's' 结尾的资源被视为复数形式的痛苦。如果您还没有看到它，您可以为您的 quiz_bs 路线命名适当的名称。为此，您可以在 config/routes.rb 文件中使用此表单：

resources :quiz_bs, as: :quiz_bs

这应该为您提供您想要的路线助手名称。您可以在Rails Routing from the Outside In 的Overriding Named Helpers 部分阅读更多相关信息。

您可能还想将您的控制器命名为QuizBsController，并且您可以在资源路由定义上使用controller: 覆盖来做到这一点。试试这个，看看它是否给你正确的控制器：

resources :quiz_bs, controller: 'quiz_bs'

您总是可以结合使用这两种路由方法并使用类似这样的方法：

resources :quiz_bs, controller: 'quiz_bs', as: :quiz_bs

查看Rails Routing from the Outside In 的Specifying a Controller to Use 部分了解更多信息和使用详情。