载波获取图像的宽度和高度，并将其存储在hstore字段中 [英] Carrierwave getting image width and height and storing it in an hstore field

问题描述

我的FileHandler模​​型可以允许所有类型的文件

  class FileHandler< ActiveRecord :: Base 
序列化：属性，ActiveRecord ::ª:: Hstore 
 mount_uploader：file_path，FileUploader 
 
 //我已经在这里设置了一些文件属性
 def update_file_attributes 
 if file_path.present？ &安培;&安培; 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 
 //我想在这里得到高度和宽度
 #Hstore 
％w [ImageHeight ImageWidth] .each do | key | 
 attr_accessible key 
 
 define_method（key）do 
 properties&&属性[键] 
结束
 
 define_method（＃{key} =）do | value | 
 self.properties =（properties || {}）。merge（key => value）
 end 
 end 
  

和我的fileUploader类

  class FileUploader< CarrierWave :: Uploader :: Base 
 
＃包括RMagick或MiniMagick支持：
包括CarrierWave :: RMagick 
 
版本：big，：if => ：图片？ do 
 process：resize_to_limit => [760，nil] 
结束
 
版本：thumb_big，：if => ：图片？ do 
 process：resize_to_limit => [200，200] 
结束
 
版本：thumb，：if => ：图片？ do 
 process：resize_to_limit => [160,160] 
结束
 
版本：tiny，：if => ：图片？ do 
 process：resize_to_limit => [40，40] 
结束
 
保护
 def image？（new_file）
 new_file.content_type.include？ 'image'
 end 
 end 
  

我的问题是，如何获得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。

解决方案

试试这个

  class FileUploader< CarrierWave :: Uploader :: Base 
 
＃包括RMagick或MiniMagick支持：
包括CarrierWave :: RMagick 
 process：store_geometry，：if => ：图片？ 
 
 ...... ...... 
＃...... 
＃...... 
 
 def store_geometry 
如果图像？（@文件）
 img = :: Magick :: Image :: read（@ file.file）.first 
如果模型
 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&&属性[键] 
结束
 
 define_method（＃{key} =）do | value | 
 self.properties =（properties || {}）。merge（key => value）
 end 
 end 
  

假设

我假设你有一个图像方法来检查文件是否为图像，这意味着你正在上传其他文件格式也是如此。那么，我已经把它用在这里，它只有在文件是图像时才调用process_geometry方法。
希望有帮助。

My FileHandler model can allows all types of files

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

And my fileUploader class

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

My question is, how do i get the height and width property of the original image and store it in the hstore field? Any help would be greatly appreciated.

解决方案

Try this

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

Assumptions
I'm assuming there's a reason you have the image method that checks if the file is an image, that must mean you're uploading other file formats as well. Well, i've put it to good use here, it calls process_geometry method only if the file is an image. Hope it helps.

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