我有RailsCasts中描述的类似模型:
应用程序/模型/ resident.rb:
class Resident < ActiveRecord::Base
include PhotoConcern
end
应用程序/模型/ employee.rb:
class Employee < ActiveRecord::Base
include PhotoConcern
end
应用程序/模型/关切/ photo_concern.rb:
module PhotoConcern
extend ActiveSupport::Concern
included do
mount_uploader :photo, PhotoUploader
attr_accessor :photo_crop_x, :photo_crop_y, :photo_crop_w, :photo_crop_h
after_save :crop_photo
def crop_photo
photo.recreate_versions! if photo_crop_x.present?
end
end
end
应用程序/上传/ photo_uploader.rb:
class PhotoUploader < CarrierWave::Uploader::Base
include CarrierWave::MiniMagick
storage :file
def store_dir
"uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
end
version :cropped do
process :crop
end
version :thumb, from_version: :cropped do
process resize_to_fill: [100, 100]
end
version :avatar, from_version: :cropped do
process resize_to_fill: [200, 200]
end
def crop
return if model.photo_crop_x.blank?
resize_to_limit(500, nil)
resize_to_fit(500, nil)
manipulate! do |img|
size = model.photo_crop_w << 'x' << model.photo_crop_h
offset = '+' << model.photo_crop_x << '+' << model.photo_crop_y
img.crop("#{size}#{offset}")
img
end
end
end
应用程序/视图/雇员/ show.slim
= image_tag (@employee.photo.present? ? @employee.photo.url(:avatar) : "client_#{@employee.sex}.png"), class: 'img-circle img-responsive'
我想在裁剪后重命名版本文件,这样我的用户就不会对缓存感到困难。它在CarrierWave wiki中描述了如何重命名文件,但 it's written &#34;为了保存新生成的文件名,您必须调用save!在recreate_versions之后的模型上!&#34;。
如何重命名版本文件?我无法再次在我的员工save!
中拨打after_save
,因为有更多的挂钩不应该被调用两次。此外,PhotoConcern还包含在另一个类中。
相关的wiki文章:
答案 0 :(得分:5)
为了保存新生成的文件名,您必须调用save!在recreate_versions之后的模型上!。
所以我相信你怀疑的答案包含在Carrierwave rubydocumentation
中
recreate_versions!(*versions) ⇒ Object
重新创建版本并重新处理它们。如果它们的参数以某种方式发生了变化,这可用于重新创建版本。
如果未省略*versions
,则此方法将存储cached file
,否则将存储# File 'lib/carrierwave/uploader/versions.rb', line 216
def recreate_versions!(*versions)
# Some files could possibly not be stored on the local disk. This
# doesn't play nicely with processing. Make sure that we're only
# processing a cached file
#
# The call to store! will trigger the necessary callbacks to both
# process this version and all sub-versions
if versions.any?
file = sanitized_file if !cached?
# the file will be stored
store_versions!(file, versions)
else
cache! if !cached?
# If new_file is omitted, a previously cached file will be stored.
store!
end
。
store!(new_file = nil) ⇒ Object
store!
做了什么?
这是the rubydoc page about store!
class PhotoUploader < CarrierWave::Uploader::Base
通过将文件传递给此Uploader的存储引擎来存储文件。 如果省略new_file,则将存储先前缓存的文件
此方法包含在with_callbacks
中,并使用:store
使用回调# File 'lib/carrierwave/uploader/store.rb', line 53
def store!(new_file=nil)
cache!(new_file) if new_file && ((@cache_id != parent_cache_id) || @cache_id.nil?)
if !cache_only and @file and @cache_id
with_callbacks(:store, new_file) do
new_file = storage.store!(@file)
if delete_tmp_file_after_storage
@file.delete unless move_to_store
cache_storage.delete_dir!(cache_path(nil))
end
@file = new_file
@cache_id = nil
end
end
end
存储您的文件。回调会触发此方法。
store_versions!
def store_versions!(new_file, versions=nil)
if versions
active = Hash[active_versions]
versions.each { |v| active[v].try(:store!, new_file) } unless active.empty?
else
active_versions.each { |name, v| v.store!(new_file) }
end
end
方法做什么?
after :store, :store_versions!
什么是Carrierwave回调以及如何使用它们?
after :store, :my_method
SO explains和wiki上的这个问题解释了回调的工作原理,通过在version :low do
区块内执行my_method
,您将仅在after :store
执行:store
{1}}回调(仅适用于该版本)。
store!
回调对应于@filename
的执行。
recreate_versions!
属性是什么? @filename
如何编码文件名?
filename
是使用lib/carrierwave/uploader/store.rb
##
# Override this in your Uploader to change the filename.
#
# Be careful using record ids as filenames. If the filename is stored in the database
# the record id will be nil when the filename is set. Don't use record ids unless you
# understand this limitation.
#
# Do not use the version_name in the filename, as it will prevent versions from being
# loaded correctly.
#
# === Returns
#
# [String] a filename
#
def filename
@filename
end
定义的
def filename
来自carrierwave的指南建议在使用recreate_version!
重新创建版本时使用save!
重新创建唯一的文件名。
此方法无法保存到数据库,要保存到数据库,您需要在appropriata Carrierwave
回调上调用Carrierwave
,而不会让您$user = wp_get_current_user();
if ( in_array( 'administrator', (array) $user->roles ) ) {
//This user is administrator
}
GEM
我没有解决此问题的方法,但没有相关文档,我们应该开始构建它。
答案 1 :(得分:0)
对于那些希望在保存后更改上载文件名的人,您以某种方式重命名了磁盘上的文件。您可以直接在数据库中更改记录而无需回调,然后重新加载activerecord。
例如,
photo.update_column(:attachment_file_name, "new_name.jpg")
photo.reload