Question

我的FileHandler模型可以允许所有类型的文件

class FileHandler < ActiveRecord::Base
   serialize :properties, ActiveRecord::Coders::Hstore
   mount_uploader :file_path, FileUploader

  //I'm already setting some of the file attributes here
  def update_file_attributes
    if file_path.present? && file_path_changed?
      self.file_name = file_path.file.filename
      self.file_type = file_path.file.content_type
      self.file_size = file_path.file.size
    end
  end
  //I want to get height and width here
  #Hstore
  %w[ImageHeight ImageWidth].each do |key|
    attr_accessible key

    define_method(key) do
      properties && properties[key]
    end

    define_method("#{key}=") do |value|
      self.properties = (properties || {}).merge(key => value)
    end
  end

我的fileUploader类

class FileUploader < CarrierWave::Uploader::Base

  # Include RMagick or MiniMagick support:
  include CarrierWave::RMagick

   version :big, :if => :image? do
    process :resize_to_limit => [760, nil]
   end

   version :thumb_big, :if => :image? do
    process :resize_to_limit => [200, 200]
   end

   version :thumb, :if => :image? do
    process :resize_to_limit => [160, 160]
   end

   version :tiny, :if => :image? do
    process :resize_to_limit => [40, 40]
   end

   protected
     def image?(new_file)
      new_file.content_type.include? 'image'
     end
end

我的问题是，如何获取原始图像的高度和宽度属性并将其存储在hstore字段中？任何帮助将不胜感激。

Answer 1

试试这个

class FileUploader < CarrierWave::Uploader::Base

  # Include RMagick or MiniMagick support:
  include CarrierWave::RMagick
  process :store_geometry, :if => :image?

  #......
  #......
  #......

  def store_geometry
    if image?(@file)
      img = ::Magick::Image::read(@file.file).first
      if model
        model.ImageWidth = img.columns
        model.ImageHeight = img.rows
      end
    end
  end
end

#Hstore

  %w[ImageHeight ImageWidth].each do |key|
    attr_accessible key

    define_method(key) do
      properties && properties[key]
    end

    define_method("#{key}=") do |value|
      self.properties = (properties || {}).merge(key => value)
    end
  end

假设
我假设您有使用图像方法检查文件是否为图像的原因，这也意味着您还要上传其他文件格式。好吧，我在这里很好地使用它，它只在文件是图像时才调用process_geometry方法。希望它有所帮助。

Answer 2

根据我所知，你可以使用Rmagick来获取Image的维度

我记得你能做的就是这个

  img = Magick::Image::read("image_file").first

  img.columns  => width of image
  img.rows   => height of image

也许那时你可以在HSTORE中设置它们

希望这个帮助

由于

Answer 3

作为汤米评论的补充。这就是我所做的，以保存每个特定图像版本的大小，而不仅仅是原始图像的大小。你必须在你的模型中添加“几何”字段，这样你就会有类似的东西：“phone = 146x220＆amp; tablet = 292x440”

    class ImageUploader < CarrierWave::Uploader::Base
        include CarrierWave::RMagick

        storage :file

        version :thumb do
            process :resize_to_fill => [80, 80]
        end

        version :phone do
            process :resize_to_limit => [290, 220]
            process :store_geometry => :phone
            process :quality => 75
        end

        version :tablet do
            process :resize_to_limit => [580, 440]
            process :store_geometry => :tablet
            process :quality => 35
        end

        process 

        def extension_white_list
            %w(jpg jpeg gif png)
        end

        def store_geometry(version)
            manipulate! do |img|
                model.geometry ||= ""
                model.geometry << "&" unless model.geometry.empty?
                model.geometry << "#{version}=#{img.columns}x#{img.rows}"
                img
            end
        end

    end

Carrierwave获取图像宽度和高度并将其存储在hstore字段中

3 个答案: