Rails 4：评论部分不呈现

Question

尝试显示照片的 cmets，照片属于个人资料。 html 不呈现。

相关代码：

routes.rb

  resources :profiles do
    resources :photos do
      resources :comments do
        resources :comments
      end
    end
  end

cmets/_comment.html.haml

= comments.each do |comment|
  %li
    = comment.body 
    \-
    %small Submitted 
    = #{time_ago_in_words(comment.created_at)}

    = semantic_form_for [@profile, @photo, comment, Comment.new] do |f|
      = f.inputs do
        = f.input :body, placeholder: "Add a Reply"
        %br/
      = f.actions do
        = f.action :submit, :as => :input, label: "Reply"
    %ul
      - render partial: 'comments/comment', locals: {comments: comment.comments}

models/photo.rb

class Photo < ActiveRecord::Base
  belongs_to :profile
  has_many :comments, as: :commentable, :dependent => :destroy
end

models/comment.rb

class Comment < ActiveRecord::Base
  belongs_to :profile
  belongs_to :commentable, polymorphic: true
  has_many :comments, as: :commentable, :dependent => :destroy
end

models/profile.rb

class Profile < ActiveRecord::Base
  belongs_to :user
  has_many :photos, :dependent => :destroy
  has_many :comments, :dependent => :destroy
end

app/controllers/phtos_controller.rb

class PhotosController < ApplicationController
  before_action :set_photo, only: [:show, :edit, :update, :destroy]
  before_action :set_profile
  load_and_authorize_resource

  def index
    @photos = Photo.where(:profile => @profile)
  end

  def show
  end

  def new
    @photo = Photo.new(:profile => @profile)
  end

  def edit
  end

  def create
    @photo = Photo.new(photo_params.merge(:profile_id => @profile.id))

    respond_to do |format|
      if @photo.save
        format.html { redirect_to [@profile, @photo], notice: 'Photo was successfully created.' }
        format.json { render :show, status: :created, location: @photo }
      else
        format.html { render :new }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @photo.update(photo_params)
        format.html { redirect_to [@profile, @photo], notice: 'Photo was successfully updated.' }
        format.json { render :show, status: :ok, location: @photo }
      else
        format.html { render :edit }
        format.json { render json: @photo.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @photo.destroy
    respond_to do |format|
      format.html { redirect_to profile_photos_url, notice: 'Photo was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
  # Use callbacks to share common setup or constraints between actions.
  def set_photo
    @photo = Photo.find(params[:id])
  end

  def set_profile
    @profile = Profile.find(params[:profile_id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def photo_params
    params.require(:photo).permit(:description, :attachment)
  end
end

/app/views/photos/show.html.haml

= render partial: "layouts/sub_header", locals: {heading:    @photo.profile.name + "'s", sub_heading: "photo", current_bread_crumb: @photo.profile.name + "'s photo", include_crumbs: true}
/ Intro Content
.row
  .col-md-6
    = image_tag @photo.attachment.url(:large), :class => "img-responsive"
  .col-md-6
    %p
      %h2 About this photo...
      = simple_format(@photo.description)
      ,
 / /.row

 %h3 Comments

 = semantic_form_for [@profile, @photo, Comment.new] do |f|
   = f.inputs do
     = f.input :body, :as => :text
   = f.actions do
     = f.action :submit, :as => :input

 %ul
   - render partial: 'comments/comment', locals: {comments: @photo.comments}

 - if current_user == @profile.user
   = link_to 'Edit', edit_profile_photo_path(@profile, @photo)
   |
  = link_to 'Back', :back

正在将数据插入数据库（profile_id 除外，但我会将其保存到另一篇文章中）。我手动更新了 db 中的 profile_id 以查看它是否只是数据完整性问题，仍然没有。

我尝试在 routes.rb 中移动资源，我尝试重构视图以直接加载集合而不使用部分，似乎没有任何效果。

此外，如果我注释掉部分并使用此代码，我确实会在页面上看到评论正文，所以这肯定是我在调用部分或部分本身时做错了。

%ul
  - @photo.comments.each do |comment|
    = comment.body

我似乎无法破解这个，我知道这不是魔法，但我显然没有看到任何东西。

感谢您的帮助！

Answer 1

将show.html.haml 更改为：

%ul
  - render 'comments/comment', locals: {comments: @photo.comments}

原因是，您不能在视图中渲染视图，因此上面假设您正在 cmets 文件夹中查找名为 _comment.html.haml 的部分内容。

Answer 2

感谢 Marc 和 Jarvis 的所有帮助，我仍然不知道为什么这不起作用，但是查看 api.rubyonrails.org 上的 ActionView::PartialRender 我发现这确实有效...

  - @photo.comments.each do |comment|
    = render partial: 'comments/comment', locals: { comment: comment }

我基本上必须自己进行迭代，尽管在 Marc 引用的指南中明确表示我应该能够做我所写的。

哦，好吧，继续下一个问题。

再次感谢！