沒有路線匹配{：action =>「edit」，：controller =>「quiz_bs」，：id => nil}缺少必需的鍵：[：id]

Question

我試圖鏈接以添加編輯測驗鏈接我的Rails應用程序，但我得到這個錯誤：

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

我已經看過類似的帖子（like this one），但他們的答案似乎並沒有解決問題，即使他們提出類似的情況。

錯誤是出現了此行的我application.html.erb代碼：

<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> 

但鏈接也將是我的節目的用戶頁面上：

<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 %> 

這裏是我的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 

而相應的路線是：

 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 

我會很感激任何幫助找出問題在這裏！

Answer 1

在application.html.erb，更改爲：

<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> 

• 我們希望改變@user到current_user，因爲這種觀點是整個網站的模板。無法保證@user將成爲每個控制器中的全局變量（並且這可能不是您想要的）。使用current_user方法將始終可用，並讓您登錄的用戶。
• 注意：id:這裏沒有必要，通過的模型將被用作id。

在users/show.html.erb，更改爲：

<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，你就不會在你的users_controller定義就像你在做quiz_bs_controller一個變量。您正在訪問@user.quiz_bs，因此您想要鏈接到代碼中的特定實例。

全球@quiz_b只適用於您定義此變量的頁面，該頁面可能是quiz_b路徑下的任何頁面。

最後，在quiz_bs_controller：

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

當與形式的結合使用這種方法聲明爲：

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

您需要要求您params:quiz_bs爲了範圍的參數該模型正在編輯中;在這種情況下，@quiz_bs。否則，在更新/創建測驗時不會找到變量。

Answer 2

這裏是你的問題：

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

你要通過編輯操作的ID，它的路由結構的一部分。在你的路由輸出它甚至可以顯示你：

/quiz_bs/:id/edit 

沒有這個ID，在/：ID /編輯路線是根本行不通的 - 這是Rails機制。

在你的Gemfile：

group :development do 
    gem 'pry-rails' 
end 

和：

bundle install 

在 application.html.erb這種邏輯上面

然後做：

<% 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 %> 

現在，再次點擊頁面。 Pry將產生一個調試斷點，這將允許您評估服務器當前正在運行的終端中的@user對象。我對你最好的建議是學習調試你自己的代碼 - 這是一個情境，有很多你不能提供訪問你的應用程序不能提供的上下文。