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ruby-on-rails - 没有路由匹配缺少必需的键：[:id]。破坏

问题描述

resources :users do
   resources :posts, only: %i[create destroy]
end  

class PostsController < ApplicationController
  before_action :set_user
  before_action :set_post, expect: [:create]
  def create
    @post = @user.posts.build(params_post)

    if @post.save
      flash[:success] = "Post created!"
      redirect_to user_path(@user)
    else
      @posts = Post.all
      render "users/show"
    end 
  end 

  def destroy
    @post.destroy
    flash[:success] = "Post deleted!"
    redirect_to user_path(@user)
  end 

  private

  def set_user
    @user = User.find(params[:user_id])
  end 

  def set_post
    @post = @user.posts.find(params[:id])
  end 

  def params_post
    params.require(:post).permit(:content)
  end 
end

# views/users/show.html.erb 
<article>
  <% @user.posts.each do |post| %>
    <p> 
      <%= post.content %>
      <small><%= formatted_at_time(post.created_at) %></small>
    </p>

    <% if post.user == current_user %>
    <%= link_to "Delete", user_post_path(@user, post),
        data: { method: :delete, confirm: "Are you sure?" }, class: "btn btn-danger" %>
    <% end %>
  <% end %>
</article>

ActionView::Template::Error (没有路由匹配 {:action=>"destroy", :controller=>"posts", :id=>nil, :user_id=>"4"}, 缺少必需的键: [:id ]): 19:

20: 21: <% if post.user == current_user %> 22: <%= link_to "Delete", user_post_path(@user, post), 23: data: { method: :delete, confirm: "你确定吗？ " }，类：“btn btn-danger”%> 24: <% end %> 25: <% end %>

先感谢您！

标签： ruby-on-rails

解决方案

您必须users#show在用户控制器中的显示操作上初始化了一个新帖子，这会导致一个属于该用户的新帖子，因此当您在显示模板中循环它时，帖子也在循环中，但该新帖子是一条新记录并且没有身份证。

由于您正在循环@user.posts，因此无需检查post.user == current_user并请从此更改：

<% if post.user == current_user %>
    <%= link_to "Delete", user_post_path(@user, post),
        data: { method: :delete, confirm: "Are you sure?" }, class: "btn btn-danger" %>
<% end %>

对此

<% if post.persisted? %>
    <%= link_to "Delete", user_post_path(@user, post),
        data: { method: :delete, confirm: "Are you sure?" }, class: "btn btn-danger" %>
<% end %>

#persisted?

如果记录被持久化，即它不是新记录并且没有被销毁，则返回 true，否则返回 false。

#persisted?在此处查看更多信息https://apidock.com/rails/v5.2.3/ActiveRecord/Persistence/persisted%3F

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