CarrierWave - PDF - Sadece ilk sayfayı seçin

Question

Raylarım uygulamasında carrierwave yüklü var. Ancak bir kullanıcı bir çoğaltılan pdf yüklediğinde sadece uygulamanın belgede ilk sayfayı almasını ve bir jpeg'e dönüştürmesini istiyorum. Bu mümkün mü ve hangi komutla?

Bu benim yükleyicim.

# 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 

Answer 1

Bunun sizin için çalıştığını düşünüyorum:

read more

def cover 
    manipulate! do |frame, index| 
     frame if index.zero? 
    end 
    end 


version :thumb do 
    process :cover 
    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 :cover 
    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 :cover 
    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