CarrierWave display image_url error

Question

Я использую CarrierWave для загрузки изображений на свой сервер. Однако, когда я ссылаюсь на них с помощью image_url, я получаю NoMethodError для nil: NilClass для image_url.

приложение/активы/мнения/альбомы/index.html.erb

<% @albums.each do |album| %> 
.... 
<div> 
    <%= image_tag @album.image_url.to_s %> 
</div> 
<%end%> 

приложение/Config/routes.rb

namespace :admin do 
    root :to => "dashboard#index" 
    resources :dashboard 
    resources :albums do 
     resources :images 
end 
    get "admin/album" 

приложение/активы/просмотр/альбомы /new.html.erb

<div> 
    <%= f.file_field :image %> 
</div> 

приложение/активы/модели/Image.rb

class Image < ActiveRecord::Base 
    attr_accessible :album_id, :title, :image 
    belongs_to :album 
    mount_uploader :image, ImageUploader 
end 

image_uploader.rb

# encoding: utf-8 

class ImageUploader < CarrierWave::Uploader::Base 

    # Include RMagick or MiniMagick support: 
    # include CarrierWave::RMagick 
    # include CarrierWave::MiniMagick 

    # Include the Sprockets helpers for Rails 3.1+ asset pipeline compatibility: 
    # include Sprockets::Helpers::RailsHelper 
    # include Sprockets::Helpers::IsolatedHelper 

    # Choose what kind of storage to use for this uploader: 
    storage :file 
    # storage :fog 

    # Override the directory where uploaded files will be stored. 
    # This is a sensible default for uploaders that are meant to be mounted: 
    def store_dir 
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}" 
    end 

    # Provide a default URL as a default if there hasn't been a file uploaded: 
    # def default_url 
    # # For Rails 3.1+ asset pipeline compatibility: 
    # # asset_path("fallback/" + [version_name, "default.png"].compact.join('_')) 
    # 
    # "/images/fallback/" + [version_name, "default.png"].compact.join('_') 
    # end 

    # Process files as they are uploaded: 
    # process :scale => [200, 300] 
    # 
    # def scale(width, height) 
    # # do something 
    # end 

    # Create different versions of your uploaded files: 
    # version :thumb do 
    # process :scale => [50, 50] 
    # end 

    # Add a white list of extensions which are allowed to be uploaded. 
    # For images you might use something like this: 
    # def extension_white_list 
    # %w(jpg jpeg gif png) 
    # end 

    # Override the filename of the uploaded files: 
    # Avoid using model.id or version_name here, see uploader/store.rb for details. 
    # def filename 
    # "something.jpg" if original_filename 
    # end 

end 

Я пытался в течение нескольких часов, чтобы исправить эту ошибку. Я могу получить ошибку, установив путь image_tag на image_url(@album), но это не отображает изображение.

Дополнительная информация

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script/rails:6:in `require' 
script/rails:6 

приложение/активы/просмотров/альбомы/index.html.erb

<h1>These are the albums</h1> 
<% @albums.each do |album| %> 
<div class="item" style="background: #e4e4e4; border: 2px solid #c9c9c9; padding:1.5em 0 1.5em 0; width:17em; font-family: 'Signika Negative';"> 
<div class="title" style="background: #d3d3d3; display: inline-block; padding:1.5em 0  1.5em 1em; width: 12em;"> 
<strong>Title</strong> </br> 
<%= album.title %></div> 
</br> 
<div class="description" style="background: #f9f9f9; display: inline-block; padding: 1.5em 0 1.5em 1em; width: 12em;"> 
<strong>Description</strong> </br> 
<%= album.description %> 
</div> 
</br> 
<div> 
<%= image_tag album.image.image_url.to_s %> 
</div> 
<div> 

</div> 
<%= link_to "Delete", admin_album_path(album), :method => :delete, :style => "margin: 1em 0 0 1em; display: block;" %> 
</br> 
</div> 
<% end %> 
<%=link_to "New Album", :controller => "albums", :action => "new" %> 
<%=link_to "Manage Pictures"%> 

Answer 1

Вы, кажется, имеют отношение от альбомов к изображениям. Предполагая, что альбом HAS_MANY изображения вам нужно:

@albums.each do |album| 
    album.images.each{|image| image.image_url } 
end