Question

我试图触发群组/节目视图中的所有帖子，但我收到错误＆＃34;未定义的方法`每个＆＃39;为零：NilClass＆＃34;。有人可以帮帮我吗？

~~对不起我的错误编码行为

posts_controller：

class PostsController < ApplicationController

  def index
    @posts = Post.all
  end

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

  def new
    @post = Post.new
  end

  def create
    post = Post.create(permitted_params)
    redirect_to post
  end

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

  def update
    post = Post.find(params[:id])
    post.update permitted_params
    redirect_to post
  end

  def destroy
    Post.destroy(params[:id])
    redirect_to posts_path
  end

  def permitted_params
    params.require(:post).permit(:message)
  end

end

groups_controller：

class GroupsController < ApplicationController

  def index
  end

  def show
    @group = Group.find(params[:id])
  end


  def new
    @group = Group.new
  end

  def create
    group = Group.create(permitted_params)
    redirect_to group
  end

    def permitted_params
      params.require(:group).permit(:name)
  end

end

基团/ show.html.erb：

<div class="container">
<p><i><%= @post.message %></i><p>

  <%= render 'posts/each' %>

  <% if user_signed_in? %>
  <p><%= link_to "Powrót", root_path %></p>
  <p><%= link_to "Usuń wiadomość", @post, method: :delete, data: { confirm: 'Jesteś pewien?' } %></p>
  <% end %>
</div>

_each.html.erb：

  <% @posts.each do |post| %>
    <ul><i><%= link_to post.message, post %></i></ul></br>
  <% end %>

路线：

devise_for :users

  root 'posts#index'

  resources :posts
  resources :groups

  get 'posts/each' => 'posts#each'
  get 'posts/group1' => 'posts#group1'

Answer 1

in groups_controller.rb

def show
  @group = Group.find(params[:id])
  @posts = Post.where(group_id: @group_id)
end

in groups / show.html.erb

<div class="container">

  <%= render 'posts/each', {posts: @posts} %>

  <% if user_signed_in? %>
    <p><%= link_to "Powrót", root_path %></p>
    <p><%= link_to "Usuń wiadomość", @post, method: :delete, data: { confirm:'Jesteś pewien?' } %></p>
  <% end %>
</div>

帖子中的

/ _each.html.erb

<% posts.each do |post| %>
  <ul><i><%= link_to post.message, post %></i></ul></br>
<% end %>

Answer 2

group_controller中没有@post变量＆＃39; s＆＃39; show＆＃39;行动。可能你需要表演行动中的东西，如：

@posts = Post.where(group_id: @group.id)

此外，当您从另一个文件夹渲染部分时，您必须传递实例变量的值（如果我错了，请更正我）。 e.g

<%= render 'posts/each', {posts: @posts} %>

并通过＆＃39;帖子＆＃39;迭代而不是＆＃39; @ posts＆＃39;

未定义的方法`每个＆＃39; for nil：从另一个控制器调用NilClass

2 个答案: