Question

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，这时该帖子在功能上可以正常运行，但评论表单仅可以使用一次，此后在帖子页面上崩溃，并显示以下错误：

Post＃show中的NoMethodError

＃的未定义方法“ to_key”   你的意思是？设置                  to_ary

通过Rails控制台，我可以看到评论已保存。

这是终端错误：

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'

这是表格：

<%= form_for @comment, url: new_comments_path(@post), method: :post, remote: true do |f| %>
    <%= f.label :title %><br>
    <%= f.text_field :title, placeholder: "Type the comment title here" %><br>
    <%= f.label :content %><br>
    <%= f.text_area :content, placeholder: "Type the comment content here" %><br>
    <%= f.submit %>
<% end %>

rails提及以下形式的行中存在错误：

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

comment_controller.rb：

class CommentController < ApplicationController
  before_action :set_comment, only: [:show, :edit, :update, :destroy]
  before_action :authenticate_user! 

  def index
    @comments = Comment.all
  end

  def new
    @comment = Comment.new
  end    

  def create 
    @post = Post.find(params[:post_id])
    @comment = @post.comments.create(params[:comment].permit(:comment))
    @comment.user = current_user
    @comment.assign_attributes(comment_params)

    if @comment.save
      format.html { redirect_to @link, notice: 'Comment was successfully created.' }
      format.json { render json: @comment, status: :created, location: @comment }
    else
      format.html { render action: "new" }
      format.json { render json: @comment.errors, status: :unprocessable_entity }
    end 
  end

  def destroy
    @comment.destroy
    respond_to do |format|
      format.html { redirect_to :back, notice: 'Comment was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private

    def set_comment
      @comment = Comment.find(params[:id])
    end

    def comment_params
      params.require(:comment).permit(:post_id, :content, :title, :user_id)
    end
end

routes.rb：

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'

和post_controller：

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

预先感谢您的帮助。

Answer 1

我认为替换此行：

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

与此：

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

应该解决该问题！

RoR-表格只能使用一次

1 个答案: