The working basics

app/uploaders/avatar_uploader.rb

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+# encoding: utf-8
+require 'carrierwave/processing/mini_magick'
+
+class AvatarUploader < CarrierWave::Uploader::Base
+
+	include CarrierWave::ImageOptimizer
+	include CarrierWave::MiniMagick
+
+	# Include RMagick or MiniMagick support:
+	# include CarrierWave::RMagick
+	# include CarrierWave::MiniMagick
+
+	# Choose what kind of storage to use for this uploader:
+
+	storage :file
+	process :optimize
+
+	@@sizes = {:thumb => [120, 120], :icon => [48, 48]}
+	# 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('_')
+		"http://placehold.it/" + (@@sizes[version_name] || [300, 300]).join('x')
+	end
+
+	# Process files as they are uploaded:
+	# process :scale => [200, 300]
+	#
+	#def scale(width, height)
+	#end
+
+	# Create different versions of your uploaded files:
+	version :thumb do
+		process :resize_to_fill => @@sizes[:thumb]
+	end
+
+	version :icon do
+		process :resize_to_fill => @@sizes[:icon]
+	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

app/uploaders/cover_uploader.rb

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+# encoding: utf-8
+require 'carrierwave/processing/mini_magick'
+
+class CoverUploader < CarrierWave::Uploader::Base
+
+	include CarrierWave::ImageOptimizer
+	include CarrierWave::MiniMagick
+
+	storage :file
+	process :optimize
+
+	def store_dir
+		"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
+	end
+
+end

app/uploaders/logo_uploader.rb

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+# encoding: utf-8
+
+class LogoUploader < CarrierWave::Uploader::Base
+
+	# Include RMagick or MiniMagick support:
+	# include CarrierWave::RMagick
+	include CarrierWave::ImageOptimizer
+	include CarrierWave::MiniMagick
+
+	# Include RMagick or MiniMagick support:
+	# include CarrierWave::RMagick
+	# include CarrierWave::MiniMagick
+
+	# Choose what kind of storage to use for this uploader:
+
+	storage :file
+	process :optimize
+
+	# 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 :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

app/uploaders/poster_uploader.rb

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+# encoding: utf-8
+
+class PosterUploader < 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 :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:
+  #   # 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 :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