Question

我想创建一个图片上传器。用户可以将网址粘贴到随后上传的图片或从本地计算机上传图片。我应该如何验证图像？

如何使用paperclip或其他图像上传宝石创建此内容？

我的观点：

<%= simple_form_for [:admin, @konkurrancer], :html => { :multipart => true } do |f| %>
    <%= f.input :name, :label => 'Titel', :style => 'width:500;' %>
    <%= f.file_field :photo, :label => '125x125', :style => 'width:250;' %> or 
    <%= f.input :photo, :label => '125x125', :style => 'width:500;' %>
    <%= f.button :submit, :value => 'Create item' %>
<% end %>

Answer 1

这是一种如何实现远程上传（仍使用回形针）的方法：

创建一个这样的类：

require 'open-uri'

# Make it always write to tempfiles, never StringIO
OpenURI::Buffer.module_eval {
  remove_const :StringMax
  const_set :StringMax, 0
}

class RemoteUpload 

  attr_reader :original_filename, :attachment_data

  def initialize(url) 
    # read remote data
    @attachment_data    = open(url)

    # determine filename
    path = self.attachment_data.base_uri.path

    # we need this attribute for compatibility to paperclip etc.
    @original_filename = File.basename(path).downcase
  end

  # redirect method calls to uploaded file (like size etc.)
  def method_missing(symbol, *args)
    if self.attachment_data.respond_to? symbol
      self.attachment_data.send symbol, *args
    else
      super
    end
  end

end

修改

您可以在模型中添加像photo_remote_url这样的虚拟属性：

class YourModel < ActiveRecord::Base attr_accessor :photo_remote_url def photo_remote_url=(url) return if url.blank? self.photo = RemoteUpload.new(url) end end

Rails如何创建多选图像上传

1 个答案: