我正在使用Rails 3和carrierwave gem。carrierwave缓存图像和主动记录
我的问题是下一个:
我编码与多个模型和关系向导形式。所以我的应用程序的产品有许多图像通过图像模型(它已被载入载波)。
由于表单有很多步骤,我希望暂时保存CarrierWave中具有缓存选项的图像。那么我最后一步我想恢复图像并加载我的产品。所以我创建了一个名为TempData的模型,它临时保存数据(在这种情况下是cache_name),一个type_identifier和一个标记can_be_deleted。
例如,这些是我的模型:
产品型号:
class Product < ActiveRecord::Base
has_many :images, :as => :imageable, :dependent => :destroy
def save_images_in_temporal_folder(images_attributes)
begin
uploader = ImageUploader.new
images_attributes.to_hash.each do |image|
uploader.cache!(image[1]['filename'])
TempData.create(:data => uploader.cache_name, :can_deleted => false, :type_name => TempDataType.product_image_upload_to_words)
end
rescue
end
end
def load_images_from_temporal_folder
begin
uploader = ImageUploader.new
tmp_images = []
TempData.find_all_by_can_deleted_and_type_name(false, TempDataType.product_image_upload_to_words).map(&:data).each do |cache_name|
tmp_images << uploader.retrieve_from_cache!(cache_name)
end
tmp_images
rescue
end
end
end
图像模型
class Image < ActiveRecord::Base
attr_accessible :imageable_type, :imageable_id, :filename
belongs_to :imageable, :polymorphic => true
mount_uploader :filename, ImageUploader
#validates :filename, :presence => true
end
我ImageUploader:
class ImageUploader < CarrierWave::Uploader::Base
configure do |config|
config.remove_previously_stored_files_after_update = false
end
include CarrierWave::RMagick
storage :file
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
def self.store_dir_for_file(model, mounted, filename, version = "")
filename = "#{version}_#{filename}" unless version.blank?
"uploads/#{model.class.to_s.underscore}/#{mounted}/#{model.id}/#{filename}"
end
process :resize_to_limit => [200, 300]
version :thumb do
process :resize_to_limit => [50, 50]
end
version :big do
process :resize_to_limit => [400, 400]
end
def extension_white_list
%w(jpg jpeg gif png)
end
end
那么我如何使用模型和安装信息保存/缓存图像?如何检索缓存并使用缓存中的图像加载我的产品?
在此先感谢。对不起,我的英语,如果你需要更多的信息评论这个职位。