Initial generator for beginning migration from carrierwave to activestorage

lib/generators/cw_to_activestorage/USAGE

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+Description:
+    Explain the generator
+
+Example:
+    rails generate cw_to_activestorage
+    
+    This will create:
+        what/will/it/create

lib/generators/cw_to_activestorage/cw_to_activestorage_generator.rb

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+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+class CwToActivestorageGenerator < Rails::Generators::Base
+  source_root File.expand_path('templates', __dir__)
+
+  def copy_uploaders
+    if (!File.exists?('app/uploaders'))
+      directory 'uploaders', 'app/uploaders'
+    end
+  end
+
+  def include_uploaders
+    file_and_search = [
+      ["campaign.rb", "class Campaign < ApplicationRecord\n"],
+      ["profile.rb", "class Profile < ApplicationRecord\n"],
+      ['nonprofit.rb', "class Nonprofit < ApplicationRecord\n"],
+      ['image_attachment.rb', "class ImageAttachment < ApplicationRecord\n"],
+      ['event.rb', "class Event < ApplicationRecord\n"]
+    ]
+    file_and_search
+      .select{|filename, _| !File.read("app/models/#{filename}").include?('###MIGRATION_FIELDS_BEGIN')}\
+      .each do |filename, find_string|
+        gsub_file("app/models/#{filename}",find_string ) do |match|
+          match << File.read(Pathname(File.expand_path('templates', __dir__, )) + 'models' + "#{filename}")
+      end  
+    end
+  end
+
+  def create_column_migration_file
+    if (Dir.glob("db/migrate/*_rename_uploader_columns.rb").none?)
+      copy_file "migrate/rename_uploader_columns.rb", 
+      "db/migrate/#{DateTime.now.strftime('%Y%m%d%H%M%S')}_rename_uploader_columns.rb"
+    end
+  end
+
+  def add_carrierwave_gems
+    gem "carrierwave", "~> 1"
+    gem "carrierwave-aws"
+  end
+end

lib/generators/cw_to_activestorage/templates/initializers/carrierwave.rb

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+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+
+CarrierWave.configure do |config|
+    config.storage = :aws
+    config.aws_bucket = ENV['CARRIERWAVE_AWS_BUCKET']
+    config.aws_acl    = :public_read
+    config.asset_host = ENV['CARRIERWAVE_IMAGE_HOST'] || "https://#{config.aws_bucket}.s3.amazonaws.com"
+    # config.aws_authenticated_url_expiration = 60 * 60 * 24 * 365
+    # config.aws_credentials = {
+    #   access_key_id: ENV['CARRIERWAVE_AWS_ACCESS_KEY_ID'],
+    #   secret_access_key: ENV['CARRIERWAVE_SECRET_ACCESS_KEY'],
+    #   config: AWS.config(cache_dir: "#{Rails.root}/tmp/uploads", region: ENV['CARRIERWAVE_SECRET_ACCESS_KEY'])
+    # }
+end
+  

lib/generators/cw_to_activestorage/templates/migrate/rename_uploader_columns.rb

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+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+class RenameUploaderColumns < ActiveRecord::Migration[5.2]
+    rename_column :campaigns, :main_image, :main_image_temp
+    rename_column :campaigns, :background_image, :background_image_temp
+    rename_column :campaigns, :banner_image, :banner_image_temp
+
+    rename_column :events, :main_image, :main_image_temp
+    rename_column :events, :background_image, :background_image_temp
+
+    rename_column :image_attachments, :file, :file_temp
+
+    rename_column :nonprofits, :main_image, :main_image_temp
+    rename_column :nonprofits, :second_image, :second_image_temp
+    rename_column :nonprofits, :third_image, :third_image_temp
+    rename_column :nonprofits, :background_image, :background_image_temp
+    rename_column :nonprofits, :logo_image, :logo_image_temp
+
+    rename_column :profiles, :picture, :picture_temp
+end

lib/generators/cw_to_activestorage/templates/models/campaign.rb

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+###MIGRATION_FIELDS_BEGIN
+mount_uploader :main_image_temp, CampaignMainImageUploader
+mount_uploader :background_image_temp, CampaignBackgroundImageUploader
+mount_uploader :banner_image_temp, CampaignBannerImageUploader
+###MIGRATION_FIELDS_END

lib/generators/cw_to_activestorage/templates/models/event.rb

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+###MIGRATION_FIELDS_BEGIN
+mount_uploader :main_image_temp, EventMainImageUploader
+mount_uploader :background_image_temp, EventBackgroundImageUploader
+###MIGRATION_FIELDS_END

lib/generators/cw_to_activestorage/templates/models/image_attachment.rb

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+###MIGRATION_FIELDS_BEGIN
+mount_uploader :file_temp, ImageAttachmentUploader
+###MIGRATION_FIELDS_END

lib/generators/cw_to_activestorage/templates/models/nonprofit.rb

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+###MIGRATION_FIELDS_BEGIN
+mount_uploader :main_image_temp, NonprofitUploader
+mount_uploader :second_image_temp, NonprofitUploader
+mount_uploader :third_image_temp, NonprofitUploader
+mount_uploader :background_image_temp, NonprofitBackgroundUploader
+mount_uploader :logo_temp, NonprofitLogoUploader
+###MIGRATION_FIELDS_END

lib/generators/cw_to_activestorage/templates/models/profile.rb

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+###MIGRATION_FIELDS_BEGIN
+mount_uploader :picture_temp, ProfileUploader
+###MIGRATION_FIELDS_END

lib/generators/cw_to_activestorage/templates/uploaders/article_background_uploader.rb

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+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+# encoding: utf-8
+
+class ArticleBackgroundUploader < 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
+
+  # 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:
+    Image::DefaultNonprofitUrl
+  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 :large do
+    process resize_to_fill: [600, 400]
+  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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/article_uploader.rb

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+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+# encoding: utf-8
+
+class ArticleUploader < 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
+
+  # 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:
+    Image::DefaultNonprofitUrl
+  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 resize_to_fill: [200, 200]
+  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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/campaign_background_image_uploader.rb

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+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+# encoding: utf-8
+
+class CampaignBackgroundImageUploader < CarrierWave::Uploader::Base
+  include CarrierWave::MiniMagick
+
+  def store_dir
+    "uploads/campaigns/#{mounted_as}/#{model.id}"
+  end
+
+  # Create different versions of your uploaded files:
+  version :normal do
+    process resize_to_fill: [1000, 600]
+  end
+
+  def extension_white_list
+    %w[jpg jpeg png]
+  end
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/campaign_banner_image_uploader.rb

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+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+class CampaignBannerImageUploader < CarrierWave::Uploader::Base
+  include CarrierWave::MiniMagick
+
+  def store_dir
+    "uploads/campaigns/#{mounted_as}/#{model.id}"
+  end
+
+  def extension_white_list
+    %w[jpg jpeg png]
+  end
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/campaign_main_image_uploader.rb

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+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+class CampaignMainImageUploader < 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
+
+  # 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/campaigns/#{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:
+    Image::DefaultProfileUrl
+  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 :normal do
+    process resize_to_fill: [524, 360]
+  end
+
+  version :thumb do
+    process resize_to_fill: [180, 150]
+  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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/event_background_image_uploader.rb

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+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+class EventBackgroundImageUploader < 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
+
+  # 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/events/#{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:
+    Image::DefaultCampaignUrl
+   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 :normal do
+    process resize_to_fill: [1000, 600]
+  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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/event_main_image_uploader.rb

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+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+class EventMainImageUploader < 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
+
+  # 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/events/#{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:
+    Image::DefaultProfileUrl
+   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 :normal do
+    process resize_to_fill: [400, 400]
+  end
+
+  version :thumb do
+    process resize_to_fill: [100, 100]
+  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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/image_attachment_uploader.rb

@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+# encoding: utf-8
+
+class ImageAttachmentUploader < 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
+
+  # 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/image_attachments/#{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:
+    Image::DefaultProfileUrl
+   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 :large do
+    process resize_to_fill: [600, 400]
+  end
+  version :medium do
+    process resize_to_fill: [400, 266]
+  end
+  version :small do
+    process resize_to_fill: [400, 266]
+  end
+  # slightly smaller than the normal thumb
+  version :thumb_explore do
+    process resize_to_fill: [200, 133]
+  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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/nonprofit_background_uploader.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+
+# encoding: utf-8
+
+class NonprofitBackgroundUploader < 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
+
+  # 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/npo/#{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:
+    Image::DefaultNonprofitUrl
+   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 :normal do
+    process resize_to_fill: [1000, 600]
+  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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/nonprofit_logo_uploader.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+# encoding: utf-8
+
+class NonprofitLogoUploader < 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
+
+  # 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/npo/#{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:
+    Image::DefaultProfileUrl
+  end
+
+  # Create different versions of your uploaded files:
+  version :large do
+    process resize_to_fit: [180, 180]
+  end
+  version :normal do
+    process resize_to_fit: [100, 100]
+  end
+  version :small do
+    process resize_to_fit: [30, 30]
+  end
+
+  def extension_white_list
+    %w[jpg jpeg png gif]
+  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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/nonprofit_uploader.rb

@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+# encoding: utf-8
+
+class NonprofitUploader < 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
+
+  # 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/npo/#{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:
+    Image::DefaultProfileUrl
+  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 :nonprofit_carousel do
+    process resize_to_fill: [590, 338]
+  end
+  version :thumb do
+    process resize_to_fill: [188, 120]
+  end
+  # slightly smaller than the normal thumb
+  version :thumb_explore do
+    process resize_to_fill: [100, 100]
+  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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end

lib/generators/cw_to_activestorage/templates/uploaders/profile_uploader.rb

@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
+# encoding: utf-8
+
+class ProfileUploader < 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
+
+  # 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:
+    Image::DefaultProfileUrl
+  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 :normal do
+    process resize_to_fill: [150, 150]
+  end
+  version :medium do
+    process resize_to_fill: [100, 100]
+  end
+  version :tiny 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 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
+
+  def cache_dir
+    "#{Rails.root}/tmp/uploads"
+  end
+end