Ruby on rails RoR-表单只工作一次

我正在构建一个论坛应用程序，用户可以在其中创建帖子并对其进行评论，此时帖子功能正常，但评论表单只工作一次，从那时起，帖子页面崩溃，显示以下错误：

邮展中的命名错误

未定义的方法“to_key”# 你是说？设置 到

通过rails控制台，我可以看到注释已保存

以下是终端错误：

ActionView::Template::Error (undefined method `to_key' for #<Comment::ActiveRecord_Relation:0x007fb845e9cca8>
Did you mean?  to_set
               to_ary):
     7: <h3>Reply to thread</h3>
     8: 
     9:  <div class="comments_form">
    10:     <%= form_for @comment, url: new_comments_path(@post), method: :post, remote: true do |f| %>
    11:       <%= f.label :title %><br>
    12:     <%= f.text_field :title, placeholder: "Type the comment title here" %><br>
    13:     <%= f.label :content %><br>

app/views/post/show.html.erb:10:in `_app_views_post_show_html_erb__4054771198415677123_70214711817160'

以及邮政署署长：

class PostController < ApplicationController
  def index
    if params[:user].blank?
      @posts = Post.all.order("created_at DESC")
    else
      posts = Post.where(user_id: @user_id).order("created_at DESC")
    end
  end


  before_action :authenticate_user!
  before_action :find_post, only: [:show, :edit, :update, :destroy]

  def show
    if Comment.where(post_id: @post.id).present?
      @comment = Comment.where(post_id: @post.id)
    else
      @comment = Comment.new
    end
  end

  def new
    @post = Post.new  
  end

  def create
    @post = Post.new
    @post.user_id = current_user.id.to_i
    #Post.create(title: title.string, content: content.string, user_id: current_user.id)

    @post.assign_attributes(post_params)

    if @post.save
      flash[:notice] = "Successfully created post!"
      #Post.create(title: title.string, content: content.string, user_id: current_user.id)
      redirect_to show_path(@post)
    else
      flash[:alert] = "Error creating new post!"
      render :new
    end
  end

  def edit
  end

  def update
    @post.assign_attributes(post_params)
    if @post.changed?
      @post.save
      redirect_to show_path(@post)
    else
      render edit_path(@post)
    end
  end

  def destroy
    @post.destroy
    redirect_to root_path#, notice: “Post destroyed”
  end

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

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

class PostController

---

提前感谢您的帮助。

我想替换这一行：

<%= form_for @comment, url: new_comments_path(@post), method: :post, remote: true do |f| %>

为此：

<%= form_for @post.comments.new, url: new_comments_path(@post), method: :post, remote: true do |f| %>

---

应该解决这个问题

应该提到的是，rails声称错误出现在表单的这一行：您能在之前添加相关的web控制台输出并包含错误吗？您好，刚刚添加了终端错误消息。页面是使用JS更新注释部分还是重新加载整个页面？确实如此，非常感谢！我是这样做的：但我认为你的解决方案更好！

devise_for :users
  root                              to: 'post#index'

  #Posts
  get    '/posts/new',             to: 'post#new' 
  get    '/post/:id',              to: 'post#show',      as: 'show'
  get    '/post/:id/edit',         to: 'post#edit',      as: 'edit'
  post   '/post',                  to: 'post#create'
  put    '/post/:id',              to: 'post#update',    as: 'update'
  delete '/post/:id',              to: 'post#destroy',   as: 'delete' 

  #Comments
  post  '/post/:post_id',  to: 'comment#create', as: 'new_comments'

class PostController < ApplicationController
  def index
    if params[:user].blank?
      @posts = Post.all.order("created_at DESC")
    else
      posts = Post.where(user_id: @user_id).order("created_at DESC")
    end
  end


  before_action :authenticate_user!
  before_action :find_post, only: [:show, :edit, :update, :destroy]

  def show
    if Comment.where(post_id: @post.id).present?
      @comment = Comment.where(post_id: @post.id)
    else
      @comment = Comment.new
    end
  end

  def new
    @post = Post.new  
  end

  def create
    @post = Post.new
    @post.user_id = current_user.id.to_i
    #Post.create(title: title.string, content: content.string, user_id: current_user.id)

    @post.assign_attributes(post_params)

    if @post.save
      flash[:notice] = "Successfully created post!"
      #Post.create(title: title.string, content: content.string, user_id: current_user.id)
      redirect_to show_path(@post)
    else
      flash[:alert] = "Error creating new post!"
      render :new
    end
  end

  def edit
  end

  def update
    @post.assign_attributes(post_params)
    if @post.changed?
      @post.save
      redirect_to show_path(@post)
    else
      render edit_path(@post)
    end
  end

  def destroy
    @post.destroy
    redirect_to root_path#, notice: “Post destroyed”
  end

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

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

<%= form_for @comment, url: new_comments_path(@post), method: :post, remote: true do |f| %>

<%= form_for @post.comments.new, url: new_comments_path(@post), method: :post, remote: true do |f| %>