没有路线匹配{：action =>“edit”，：controller =>“quiz_bs”，：id => nil}缺少必需的键：[：id]

Question

我试图链接以添加编辑测验链接我的Rails应用程序，但我得到这个错误：

No route matches {:action=>"edit", :controller=>"quiz_bs", :id=>nil} missing required keys: [:id] 

我已经看过类似的帖子（like this one），但他们的答案似乎并没有解决问题，即使他们提出类似的情况。

错误是出现了此行的我application.html.erb代码：

<li> 
    <% if @user.quiz_bs == nil %> 
     <%= link_to "Body Structure Quiz", quiz_bs_path %> 
    <% else %> 
     <%= link_to "Body Structure Quiz ✓", edit_quiz_b_path(id: @user.quiz_bs) %> 
    <% end %> 
    </li> 

但链接也将是我的节目的用户页面上：

<h4>Body Structure</h4> 
    <% if @user.quiz_bs == nil %> 
    <p><%= link_to "Test Your Body Structure", new_quiz_b_path %></p> 
    <% else %> 
    <h3><%= @user.quiz_bs.bscode %></h3> 
    <p><%= link_to "Retest Results", edit_quiz_b_path(id: @quiz_bs.id) %></p> 
    <% end %> 

这里是我的quiz_bs_controller：

class QuizBsController < ApplicationController 
before_action :require_sign_in 

def show 
    @quiz_bs = QuizBs.find(params[:id]) 
end 

def new 
    @quiz_bs = current_user.quiz_bs || current_user.build_quiz_bs 
end 

def create 
    @quiz_bs = QuizBs.new 

    @quiz_bs.bs01 = params[:quiz_bs][:bs01] 
    @quiz_bs.bs02 = params[:quiz_bs][:bs02] 
    @quiz_bs.bs03 = params[:quiz_bs][:bs03] 
    @quiz_bs.bs04 = params[:quiz_bs][:bs04] 
    @quiz_bs.bs05 = params[:quiz_bs][:bs05] 
    @quiz_bs.bs06 = params[:quiz_bs][:bs06] 

    @quiz_bs.user = current_user 

if @quiz_bs.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_bs = QuizBs.find(params[:id]) 

@quiz_bs.assign_attributes(quiz_bs_params) 

if @quiz_bs.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 

def update 
@quiz_bs = QuizBs.find(params[:id]) 

@quiz_bs.assign_attributes(quiz_bs_params) 

if @quiz_bs.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_bs_params 
params.permit(:bs01, :bs02, :bs03, :bs04, :bs05, :bs06) 
end 

end 

而相应的路线是：

 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 

我会很感激任何帮助找出问题在这里！

Answer 1

在application.html.erb，更改为：

<li> 
    <% if current_user.quiz_bs.nil? %> 
     <%= link_to "Body Structure Quiz", quiz_bs_path %> 
    <% else %> 
     <%= link_to "Body Structure Quiz ✓", edit_quiz_b_path(current_user.quiz_bs) %> 
    <% end %> 
    </li> 

• 我们希望改变@user到current_user，因为这种观点是整个网站的模板。无法保证@user将成为每个控制器中的全局变量（并且这可能不是您想要的）。使用current_user方法将始终可用，并让您登录的用户。
• 注意：id:这里没有必要，通过的模型将被用作id。

在users/show.html.erb，更改为：

<h4>Body Structure</h4> 
    <% if @user.quiz_bs == nil %> 
    <p><%= link_to "Test Your Body Structure", new_quiz_b_path %></p> 
    <% else %> 
    <h3><%= @user.quiz_bs.bscode %></h3> 
    <p><%= link_to "Retest Results", edit_quiz_b_path(@user.quiz_bs) %></p> 
    <% end %> 

• @quiz_b是，你就不会在你的users_controller定义就像你在做quiz_bs_controller一个变量。您正在访问@user.quiz_bs，因此您想要链接到代码中的特定实例。

全球@quiz_b只适用于您定义此变量的页面，该页面可能是quiz_b路径下的任何页面。

最后，在quiz_bs_controller：

def quiz_bs_params 
    params.require(:quiz_bs).permit(:bs01, :bs02, :bs03, :bs04, :bs05, :bs06) 
end 

当与形式的结合使用这种方法声明为：

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

您需要要求您params:quiz_bs为了范围的参数该模型正在编辑中;在这种情况下，@quiz_bs。否则，在更新/创建测验时不会找到变量。

Answer 2

这里是你的问题：

No route matches {:action=>"edit", :controller=>"quiz_bs", :id=>nil} missing required keys: [:id] 

你要通过编辑操作的ID，它的路由结构的一部分。在你的路由输出它甚至可以显示你：

/quiz_bs/:id/edit 

没有这个ID，在/：ID /编辑路线是根本行不通的 - 这是Rails机制。

在你的Gemfile：

group :development do 
    gem 'pry-rails' 
end 

和：

bundle install 

在 application.html.erb这种逻辑上面

然后做：

<% binding.pry %> 
<% if @user.quiz_bs == nil %> 
    <p><%= link_to "Test Your Body Structure", new_quiz_b_path %></p> 
<% else %> 
    <h3><%= @user.quiz_bs.bscode %></h3> 
    <p><%= link_to "Retest Results", edit_quiz_b_path(id: @quiz_bs.id) %></p> 
<% end %> 

现在，再次点击页面。 Pry将产生一个调试断点，这将允许您评估服务器当前正在运行的终端中的@user对象。我对你最好的建议是学习调试你自己的代码 - 这是一个情境，有很多你不能提供访问你的应用程序不能提供的上下文。