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我在我的rails應用程序中安裝了carrierwave。但是,當用戶上傳多頁PDF時,我只希望應用程序獲取文檔中的第一頁並將其轉換爲JPEG格式。這是可能的,並用什麼命令?CarrierWave - PDF - 只選擇第一頁
這是我的上傳者。
# encoding: utf-8
class ImageUploader < CarrierWave::Uploader::Base
# Include RMagick or MiniMagick support:
include CarrierWave::RMagick
include CarrierWave::MimeTypes
# include CarrierWave::MiniMagick
# Include the Sprockets helpers for Rails 3.1+ asset pipeline compatibility:
include Sprockets::Helpers::RailsHelper
include Sprockets::Helpers::IsolatedHelper
# 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:
# # 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 :resize_to_fill => [150, 210]
process :convert => :jpg
def full_filename (for_file = model.source.file)
super.chomp(File.extname(super)) + '.jpg'
end
end
version :thumb_big do
process :resize_to_fill => [320, 440]
process :convert => :jpg
def full_filename (for_file = model.source.file)
super.chomp(File.extname(super)) + '.jpg'
end
end
version :normal do
process :resize_to_fill => [450, 630]
process :convert => :jpg
def full_filename (for_file = model.source.file)
super.chomp(File.extname(super)) + '.jpg'
end
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
它完美,謝謝! =) – Philip
任何人都有類似的MiniMagick解決方案? – hellion
@hellion我可以通過調整封面來實現它的效果: def cover pdf = MiniMagick :: Image.open(self.file.path) pdf.pages.first end – Blago