Question

我怎样才能获得承运人的目前情况的宽度和高度?

与此类似:

car_images.each do | image|
  image_tag( image.photo_url, :width => image.photo_width, :height => image.photo_height)
end

Unfortunately image.photo_width and image.photo_height are not working. I need to specify the width and height of the images, it is required on the jquery plugin I m using.

Answer 1

Combine https://github.com/jnicklas/carrierwave/wiki/How-to:-Get-version-image-dimens

class Image
  before_save :update_image_attributes

  private

  def update_image_attributes
    if image.present?
      self.content_type = image.file.content_type
      self.file_size = image.file.size
      self.width, self.height = `identify -format "%wx%h" #{image.file.path}`.split(/x/)
      # if you also need to store the original filename:
      # self.original_filename = image.file.filename
    end
  end
end

Answer 2

如果使用雷米克的话,你可以非常容易地把高和宽度作为你的榜样。载荷:

class ArtworkUploader < CarrierWave::Uploader::Base

  def geometry
    @geometry ||= get_geometry
  end

  def get_geometry
    if @file
      img = ::Magick::Image::read(@file.file).first
      geometry = { width: img.columns, height: img.rows }
    end
  end

end

并以你为榜样:

class Artwork < ActiveRecord::Base

  mount_uploader :image, ArtworkUploader

  before_save :save_image_dimensions

  private

    def save_image_dimensions
      if image_changed?
        self.image_width  = image.geometry[:width]
        self.image_height = image.geometry[:height]
      end
    end
end

Answer 3

或仅使用 FastImage 。这使得追溯性衡量查封更为容易。

Answer 4

@JamieD的回答对我来说是一个例外。我正在使用Migick。

因此,我向上载人补充了这样的内容。

def geometry
  @geometry ||= get_geometry
end

def get_geometry
  if @file
    img = ::Magick::Image::read(@file.file).first
    geometry = { width: img.columns, height: img.rows }
  end
end

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