Ruby on Rails中的基本图像大小调整 [英] Basic image resizing in Ruby on Rails

问题描述

我正在为我们家庭的内部网创建一个小型照片共享网站，我有一个上传功能，可以将原始大小的照片上传到数据库中。但是，我还想将照片保存为其他四种尺寸：W = 1024，W = 512，W = 256和W = 128，但只有小于原始尺寸的尺寸（例如，如果原始宽度为511，则仅生成256和128）。应始终生成宽度为128的图像（因为它是缩略图）。此外，重新调整应始终具有成比例的宽度和高度。我该如何实现呢？
我已经有了上传照片的代码：

I'm creating a little photo sharing site for our home's intranet, and I have an upload feature, which uploads the photo at original size into the database. However, I also want to save the photo in four other sizes: W=1024, W=512, W=256 and W=128, but only the sizes smaller than the original size (e.g. if the original width is 511, only generate 256 and 128). The image with a width of 128 should always be generated (because it's a thumbnail). Also, the resization should always be with a proportional width and height. How can I implement this? I already have this code to upload the photo:

def image_file=(input_data)
  self.filename     = input_data.original_filename
  self.content_type = input_data.content_type.chomp
  self.binary_data  = input_data.read
  # here it should generate the smaller sizes
  #+and save them to self.binary_data_1024, etc...
end

new.rb< - view

new.rb <-- view

<h1>New pic</h1>

<% form_for(@pic, :html => {:multipart => true}) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </p>
  <p>
    <%= f.label :description %><br />
    <%= f.text_field :description %>
  </p>
  <p>
    <%= f.label :image_file %><br />
    <%= f.file_field :image_file %>
  </p>
  <p>
    <%= f.submit 'Create' %>
  </p>
<% end %>

<%= link_to 'Back', pics_path %>

谢谢

推荐答案

只需使用回形针或 attachment_fu

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