创建并保存对象后，Hero_id和villain_id变为nil，嵌套路线无法导航至正确的路径

问题描述

我设置了一个控制器警报，以在索引或显示路由返回到零时向我发出警报，即尝试路由到它们时，即我单击link_to链接到涉及“ Thor”的英雄并收到此错误。

我最终要完成的工作是尝试将这些路线嵌套在一起，以便所有英雄和最终恶棍都将被关联并嵌套在报告路线中，并且用户将最终能够输入新的英雄（如果还没有的话）。但是，它似乎并未分配hero_id或villain_id。但是，它确实分配了提交报告的用户的user_id。

我怀疑这与我的关联被关闭或未正确同步有关，但是我可能是错的。

英雄控制器

def index
    if params[:report_id]
        @report = Report.find_by(id: params[:report_id])
        if @report.nil?
            redirect_to reports_path,alert: "Report not found"
        else
            @heros = @reports.heros
        end
    else
        @heros = Hero.all
    end
end

def show
    if params[:report_id]
        @report = Report.find_by(id: params[:report_id])
        @hero = @report.heros.find_by(id: params[:id])
            if @hero.nil?
                flash[:notice] = "Hero not found"
                redirect_to report_hero_path(@report)
            end
    else
        @hero = Hero.find(params[:id])
    end
end

def create
    @hero = Hero.build(hero_params)
    if @hero.save
        flash[:notice] = "Hero was successfully created"
        redirect_to @hero
    else
        render 'new'
    end
end

def hero_params
    params.require(:hero).permit(:hero_name)
end

报表控制器参数

def report_params
    #byebug
    params.require(:report).permit(:subject,:description,:hero_ids,:villain_ids)
end

报告模型

class Report < ApplicationRecord
   validates :subject,presence: true,length: { minimum: 6,maximum: 100 }
   validates :description,length: { minimum: 10,maximum: 300 }

   belongs_to :user
   
   has_many :report_heros
   has_many :heros,through: :report_heros

   has_many :report_villains
   has_many :villains,through: :report_villains
end

英雄模型

class Hero < ApplicationRecord
    validates :hero_name,length: { minimum: 3,maximum: 25 }
    validates_uniqueness_of :hero_name
    
    has_many :report_heros
    has_many :reports,through: :report_heros,dependent: :destroy

end

路线

Rails.application.routes.draw do
  devise_for :users,controllers: { omniauth_callbacks: 'users/omniauth_callbacks' },skip: [:mailer,:unlocks,:passwords,:confirmations]  
  resources :users,except: :new

  resources :reports do
    resources :heros,only: [:index,:new,:show]
  end
  
  resources :heros
  resources :villains

  
  get 'about',to: 'pages#about'

  root 'pages#home'
end

报告索引

<div class="container">
   <h1 class="row justify-content-center">Report Index</h1>
   <table class="table table-bordered bg-light">
      <thead bgcolor="#959595">
         <tr>
            <th scope="col">Subject</th>
            <th scope="col">Description</th>
            <th scope="col">Created By</th>
            <th scope="col">Hero Involved</th>
            <th scope="col">Villain Involved</th>
            <th scope="col">Edit</th>
            <th scope="col">Delete</th>
         </tr>
      </thead>
      <tbody>
         <% @reports.each do |report|%>
         <tr>
            <td><%= report.subject %></td>
            <td><%= report.description %></td>
            <td><%= link_to report.user.email,report_path(report) %></td>
            <% report.heros.each do |hero|%>
            <td><%= link_to hero.hero_name,report_heros_path(:hero_id,:report_id)  %></td>
            <% end %>
            <% report.villains.each do |villain|%>
            <td><%= villain.villain_name %></td>
            <% end %>
            <% if report.user == current_user %>
            <td><%= link_to "Edit Report",edit_report_path(report) %></td>
            <td><%= link_to "Delete Report",report_path(report),method: :delete,data: {confirm: "Are you sure?"} %></td>
            <% end %>
         </tr>
         <% end %>
      </tbody>
   </table>
   <%= link_to 'New Report',new_report_path,class: "btn btn-primary" %>
</div>

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）