Question

我正在使用Rails 4并尝试在我的Posts＃Show视图中运行@ post.image.thumb.url但是我收到此错误：

帖子中的NoMethodError＃show 显示/home/vagrant/code/nonofficejobs/app/views/posts/show.html.erb第11行提出：

未定义的方法`thumb'for＃提取的来源（第11行）： 8 9 10 11 12 13 14

      <%= link_to @post.user.name, @post.user %>
    </small>
   <p><%= markdown_to_html @post.body %></p>
   <div><%= image_tag(@post.image.thumb.url) if @post.image? %></div>
 </div>

这是我的image_uploader.rb：

# encoding: utf-8

class ImageUploader < CarrierWave::Uploader::Base

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

  # Choose what kind of storage to use for this uploader:
  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:
  #   # ActionController::Base.helpers.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 resize_to_fill: [90, 90]
  #
  # def scale(width, height)
  #   # do something
  # end

  # Create different versions of your uploaded files:
  # version :tiny do
  #    process resize_to_fill: [20, 20]
  #  end

  version :small do
    process resize_to_fill: [30, 30]
  end

  #  version :profile do
  #    process resize_to_fill: [45, 45]
  #  end

  process resize_to_fill: [300, 300]

  version :thumb do
    process resize_to_fill: [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

Answer 1

尝试从

更改您的代码

<%= image_tag(@post.image.thumb.url) if @post.image? %>

到

 <%= image_tag((@post.image.url(:thumb)) %>

不能在图像上做.thumb，即使它是在image_uploader中定义的

1 个答案: