Question

我的Rails博客引擎有问题。总的来说，帖子的注册和创建工作（它们在SQLite数据库中形成），但是当我尝试列出用户创建的所有帖子时，它会在用户的show.html.erb视图中抛出NoMethodError：undefined method ＆＃39;标题＆＃39;

PostsController.rb

class PostsController < ApplicationController
  before_action :user_is_required, only: [:create, :destroy]

  def index
    @posts = Post.all
  end

  def new
   @post = Post.new
  end

  def create
    @post = user_logged_in.posts.create(post_params)
    if @post.save
    flash[:success] = "Your post has been successfully saved."
      redirect_to root_path
    else
      flash[:danger] = "Oops! Something went wrong. Try again."
      redirect_to new_post_path
    end
  end

  def edit
  end

  def update
    if @post.update_attributes(post_params)
      flash[:success] = "Your post has been successfully updated."
      redirect_to post_path(@posts)
    else
      flash[:danger] = "Oops! Something went wrong. Try again."
      render 'post'
    end
  end

  def show
    @post = Post.find(params[:id])
  end

  def destroy
    if @post.destroy
      flash[:success] = "Your post has been successfully deleted."
      redirect_to posts_path
    else
      flash[:danger] = "Oops! Something went wrong. Try again."
    end
  end

  private

  def post_params
    params.require(:post).permit(:title, :content)
  end

end

show.html.erb （用户观点）

<div class="posts">
  <div class="container marketing">
    <div class="col-lg-4 col-md-4 col-xs-12 col-sm-12">
        <section id="info">
            <%= image_tag("#", :class => "user_avatar") %>
            <h2 class="user_name">
                 <%= user_logged_in.name %>
            </h2>
        </section>
  <% if user_logged_in %>
    <%= link_to "Change avatar", class: "btn btn-primary" %><br>
  <% end %>

  <%= link_to "Follow", class: "btn btn-primary" %>
    </div>
    <div class="col-lg-8 col-md-8 col-sm-12 col-xs-12">
        <h2>
            <%= user_logged_in.name %> has <%= user_logged_in.posts.count %> posts.
        </h2>
        <% if user_logged_in.posts.any? %>
            <% @posts.each do |post| %>
            <h2 class="title">
                <%= user_logged_in.posts.title %> # The line which raises the error
            </h2>
            <p class="post">
                <%= user_logged_in.posts.content %>
            </p>
            <% end %>
        <% end %>

    </div>
</div>

post.rb

class Post < ActiveRecord::Base
  belongs_to :user
  default_scope -> { order(created_at: :desc) }
  validates :user_id, presence: true
  validates :title, presence: true
  validates :content, presence: true

end

我是Ruby on Rails的新手，这是我的第一个项目。任何和所有帮助将受到高度赞赏。

提前致谢。

Answer 1

posts应该是post因为你在内部循环，<%= user_logged_in.posts.title %>应该是<%= post.title %>：

<% @posts.each do |post| %>
  <h2 class="title">
    <%= post.title %> # The line which raises the error
  </h2>
  <p class="post">
    <%= post.content %>
  </p>
<% end %>

Answer 2

认为逻辑在这里有点混乱。

user_logged_in.posts是一种关系，因此它会返回与用户登录相关联的帖子。 @posts设置了表格中的所有帖子。

<% if user_logged_in.posts.any? %>
  <% @posts.each do |post| %>
    <h2 class="title">
      <%= user_logged_in.posts.title %> # The line which raises the error
    </h2>
    <p class="post">
      <%= user_logged_in.posts.content %>
    </p>
  <% end %>
<% end %>

这表示如果登录用户有任何帖子，循环遍历所有帖子（不仅仅是用户帖子），然后我认为你想要显示用户帖子，但你出错了句法。尝试更改代码，如下所示：

<% if user_logged_in.posts.any? %>
  <% user_logged_in.posts.each do |post| %>
    <h2 class="title">
      <%= post.title %>
    </h2>
    <p class="post">
      <%= post.content %>
    </p>
  <% end %>
<% end %>

这将遍历用户帖子，将每个帖子分配到post变量，然后显示该帖子的标题和内容。

用户中的NoMethodError＃show，undefined method`title＆＃39;对于＃<post :: activerecord_associations_collectionproxy：0x00000004c5e5f0>

2 个答案: