在图像下显示评论

Question

所以我试图在我创建的图像上显示我在数据库的注释表中创建的注释。目的是创建一个像Facebook标记系统的应用程序。

我是Ruby新手，所以我不确定我需要向您展示什么，但这是图片的代码show.html.erb

<p id="notice"><%= notice %></p>
  <div id="container">
  <p>
    <b>Title:</b>
    <%= @image.title %>
  </p>

  <p>
    <b>Filename:</b>
    <%= @image.filename %>    
    <%= image_tag @image.filename %>
  </p>
  <p>
    <b>Likes:</b>
    <span id="images_<$=@image.id%>_likes_count"><%= @image.likes %></span>
  </p>
  <div id="comments">
    <h2>Comments</h2>
    <%= render :partial => "shared/comment", :collection => @image.comments%>
  </div>
</div>

<%= link_to 'Like', like_image_path(@image), :method => :post %> |
<%= link_to 'Edit', edit_image_path(@image) %> |
<%= link_to 'Back', images_path %>

这是共享区域中评论的部分内容：

<div class="comment">     
  <p>        
    <span class="commentator"><%= comment.commentator.display_name %>say's</span>      
    <%= comment.comment %>
  </p>
</div>

目标是shared/_comment.html.erb使用方法display_name。对象comment.commentator将是一个朋友的实例，需要修改这个方法，这将是他们的名字和姓氏连接在一起。

我正在运行http://localhost:3000/artists/2

时收到此错误

“私有方法`评论'呼吁nil：NilClass”

这是图像控制器中的代码

class ImagesController < ApplicationController
  # GET /images
  # GET /images.xml
  def index
    @images = Image.all

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @images }
    end
  end

  # GET /images/1
  # GET /images/1.xml
  def show
    @image = Image.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @image }
    end
  end

  # GET /images/new
  # GET /images/new.xml
  def new
    @image = Image.new

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @image }
    end
  end

  # GET /images/1/edit
  def edit
    @image = Image.find(params[:id])
  end

  # POST /images
  # POST /images.xml
  def create
    @image = Image.new(params[:image])

    respond_to do |format|
      if @image.save
        format.html { redirect_to(@image, :notice => 'Image was successfully created.') }
        format.xml  { render :xml => @image, :status => :created, :location => @image }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @image.errors, :status => :unprocessable_entity }
      end
    end
  end

  # PUT /images/1
  # PUT /images/1.xml
  def update
    @image = Image.find(params[:id])

    respond_to do |format|
      if @image.update_attributes(params[:image])
        format.html { redirect_to(@image, :notice => 'Image was successfully updated.') }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @image.errors, :status => :unprocessable_entity }
      end
    end
  end

  def like

    @image = Image.find(params[:id])
    @image.update_attribute :likes, @image.likes+1
    respond_to do |format|
    if request.xhr? 
    format.json {render :json => { :id => @image.id, :likes => @image.likes }, :layout => nil
}
    else
    format.html {redirect_to :back }
      end
    end
  end

  # DELETE /images/1
  # DELETE /images/1.xml
  def destroy
    @image = Image.find(params[:id])
    @image.destroy

    respond_to do |format|
      format.html { redirect_to(images_url) }
      format.xml  { head :ok }
    end
  end
end

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

这是图像模型

class Image < ActiveRecord::Base

    has_many :publishings
    has_many :artists, :through => :publishings

    has_many :comments, :as => :resource, :class_name => "Commentable"


end

这是评论表

class CreateCommentables < ActiveRecord::Migration
  def self.up
    create_table :commentables do |t|
      t.integer :commentator_id
      t.integer :resource_id
      t.string :resource_type
      t.integer :commentator_id
      t.string :commentator_type
      t.text :comment

      t.timestamps
    end
  end

  def self.down
    drop_table :commentables
  end
end