用回形针远程图像上传

成功实现从特雷弗土耳其人的博文"Easy Upload via URL with Paperclip"几次的代码已经经过无限递归，在这个最新的迭代我的应用程序给了我以下错误：用回形针远程图像上传

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    app/controllers/pins_controller.rb:48:in `block in create' 
    app/controllers/pins_controller.rb:47:in `create'

看起来像有某种无限发生递归，但我无法弄清楚在哪里。

下面是相关的模型是什么样子：

require 'open-uri' 

class Pin < ActiveRecord::Base 
    belongs_to :user 
    attr_accessible :description, :image, :image_url 

    has_attached_file :image, styles: { medium: "320x240>"} 

    validates :description, presence: true 
    validates :user_id, presence: true 
    validates_attachment :image, presence: true, 
                 content_type: { content_type: ['image/jpeg', 'image/jpg', 'image/png', 'image/gif'] }, 
                 size: { less_than: 5.megabytes } 


    # Remote image downloading 
    attr_accessor :image_url 
    before_validation :download_remote_image, :if => :image_url_provided? 

    private 

    def image_url_provided? 
     !self.image_url.blank? 
    end 

    def download_remote_image 
     self.image = URI.parse(image_url) 
     # self.image_remote_url = image_url 
    end 

    def do_download_remote_image 
     io = open(URI.parse(image_url)) 
     def io.original_filename; base_uri.path.split('/').last; end 
     io.original_filename.blank? ? nil : io 
    rescue # catch url errors with validations instead of exceptions (Errno::ENOENT, OpenURI::HTTPError, etc...) 
     print "An error occurred: ",$!, "\n" 
    end 
end

而且我的脚/ _form.html.erb

<%= simple_form_for(@pin, html: { class: "form-horizontal"}) do |f| %> 
    <%= f.error_notification %> 
    <%= f.full_error :image_file_size, class: "alert alert-error" %> 
    <%= f.full_error :image_content_type, class: "alert alert-error" %> 

    <%= f.input :image, label: "Upload an image" %> 
    <%= f.input :image_url, label: false, placeholder: "http://" %> 
    <%= f.input :description, as: :text, input_html: { rows: "3" } %> 

    <div class="form-actions"> 
    <%= f.button :submit, class: "btn btn-primary" %> 
    </div> 
<% end %>

最后，我销控制器是非常标准：

def new 
    @pin = current_user.pins.build 

    respond_to do |format| 
     format.html # new.html.erb 
     format.json { render json: @pin } 
    end 
    end 

    def create 
    @pin = current_user.pins.build(params[:pin]) 

    respond_to do |format| 
     if @pin.save 
     format.html { redirect_to @pin, notice: 'Pin was successfully created.' } 
     format.json { render json: @pin, status: :created, location: @pin } 
     else 
     format.html { render action: "new" } 
     format.json { render json: @pin.errors, status: :unprocessable_entity } 
     end 
    end 
    end

似乎它一遍又一遍地运行download_remote_image。

来源

2013-02-23 mattangriffel

可以包含log/ .log（可能是enviorement = development）的错误吗？包括 – p1100i 2013-02-23 01:04:47

@burninggramma。 – mattangriffel 2013-02-23 05:05:25

在阅读'before_validation'的rails文档后，似乎如果你没有指定动作，即（before_validation：download_remote_image，on =>：create），那么它每次运行被调用的方法被改变。在这种情况下，调用before_validation方法，然后在该方法内，通过'self.image ='更改对象。如果你没有指定'on create'，那么在这个阶段再次调用before_validation，从而重新启动download_remote_image方法。当它到达'self.image ='时，它会再次调用它，等等。所以也许在验证之前添加'：on =>：create'，或者在通过像'return if self.image.present？'之类的语句启动方法之前查看image对象是否已经存在。

我对轨道非常陌生，所以这个想法可能有缺陷，但它对我来说很有意义。

来源

2013-03-03 23:38:49 Clay

我能够测试这一点，我的第一个想法是不去。必须在创建之前调用下载方法才能设置引脚的图像属性。唯一可以实现的方法是将return语句添加到方法的顶部。 – Clay 2013-03-04 02:24:55

用回形针远程图像上传

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