#253 CarrierWave File Uploads

Feb 14, 2011 | 9 minutes | Plugins

CarrierWave makes it easy and clean to add file uploads to your application. It supports a variety of ORMs, frameworks and image processors.

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Paintings used in this episode are by Phil Bates (my dad).

Resources

          bash
        
bundle
rails g uploader image
rails g migration add_image_to_paintings image:string
rake db:migrate

          Gemfile
        
gem "rmagick"
gem "carrierwave"

          models/painting.rb
        
class Painting < ActiveRecord::Base
  attr_accessible :gallery_id, :name, :image, :remote_image_url
  belongs_to :gallery
  mount_uploader :image, ImageUploader
end

          app/uploaders/image_uploader.rb
        
class ImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::RMagick

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  version :thumb do
    process :resize_to_limit => [200, 200]
  end
end

          galleries/show.html.erb
        
<%= image_tag painting.image_url(:thumb) if painting.image? %>

          paintings/_form.html.erb
        
<%= form_for @painting, :html => {:multipart => true} do |f| %>
  <%= f.error_messages %>
  <%= f.hidden_field :gallery_id %>
  <p>
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </p>
  <p>
    <%= f.file_field :image %>
  </p>
  <p>
    <%= f.label :remote_image_url, "or image URL" %><br />
    <%= f.text_field :remote_image_url %>
  </p>
  <p><%= f.submit %></p>
<% end %>