问Carrierwave不渲染图像(Ruby 3，Rails 6)

EN

class Account < ApplicationRecord
  has_many :posts, dependent: :destroy
  
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :validatable
end

class Post < ApplicationRecord
  belongs_to :account
  has_many :photos, dependent: :destroy
end

class Photo < ApplicationRecord
  belongs_to :post
  validates :image, presence: true
  mount_uploader :image, PhotoUploader
end

class PhotoUploader < CarrierWave::Uploader::Base
  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

   include Cloudinary::CarrierWave

  process :convert => 'png'
  process :tags => ['post_picture']

  version :standard do
    process :resize_to_fill => [300, 300, :center]
  end

  version :thumbnail do
    resize_to_fit(100, 100)
  end
end

class PostsController < ApplicationController
    before_action :find_post, only: [:show]
    before_action :authenticate_account!

    def index
        @posts = Post.all.limit(10).includes(:photos)
        @post = Post.new
    end

      def create
        if
        Post.create(post_params)
        redirect_to posts_path
        flash[:notice] = "Success!"
        else
            flash[:alert] = "Something went wrong"
            redirect_to posts_path
        end
    end

    def show
        @photos = @post.photos
    end

    private

    def find_post
        @post = Post.find_by id: params[:id]
    return if @post
        flash[:danger] = "Post not found."
        redirect_to root_path
    end

    def post_params
        params.require(:post).permit :content
    end
end

 Rendering layout layouts/application.html.erb
  Rendering posts/index.html.erb within layouts/application
  Post Load (12.2ms)  SELECT "posts".* FROM "posts" LIMIT $1  [["LIMIT", 10]]
  ↳ app/views/posts/index.html.erb:29
  Photo Load (4.0ms)  SELECT "photos".* FROM "photos" WHERE "photos"."post_id" IN ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)  [[nil, 1], [nil, 2], [nil, 3], [nil, 4], [nil, 5], [nil, 6], [nil, 7], [nil, 8], [nil, 9], [nil, 10]]
  ↳ app/views/posts/index.html.erb:29
  Rendered posts/index.html.erb within layouts/application

<div class="d-flex flex-column align-items-center mt-3">
  <div class="col-xl-7 col-lg-8 col-md-10 col-sm-11 post-card">
    <div class="card">
      <div class="card-header">
        Create Post
        <div class="card-body">
            <%= form_for @post, :html => {:multipart => true, :class => "dropzone upload-images p-0 border-0"} do |f| %>
                <div class="form-group row mt-2">
                    <div class="col pl-0">
                        <%= f.text_field :content, class: "form_control border-0", placeholder: "Enter a comment..." %>   
                    </div>
                </div>
                <div class="fallback">
                    <%= file_field_tag "images[]", type: :file, multiple: true %>
                </div>
                <div class="dz-message m-0"></div>
                    <div class="dropzone-previews mb-3">
                        <div class="upload-photos-icon">
                        <i class="fa fa-plus fa-2x" aria-hidden="true" style="color:#dddfe2"></i>
                        </div>
                    </div>
                <%= f.submit "Submit", class: "btn-md btn-primary" %>
                <% end %>
            </div>
        </div>
    </div>
</div>