Paperclip::Error（处理缩略图时出错答案

【问题标题】：Paperclip::Error (There was an error processing the thumbnailPaperclip::Error（处理缩略图时出错
【发布时间】：2016-12-15 14:28:12
【问题描述】：

Paperclip::Error in RegistrationsController#update 处理缩略图时出错。

我正在跑步Rails 4.2.6

和paperclip", "~> 5.0.0"

我的应用程序控制器文件是：

class NewsController < ApplicationController
 def create
 @news = News.new(news_params)

  respond_to do |format|
   if @news.save
     format.html { redirect_to news_url, notice: 'News post was successfully created.' }
     format.json { render :show, status: :created, location: @news }
   else
     format.html { render :new }
     format.json { render json: @news.errors, status: :unprocessable_entity }
   end
  end
 end

 private
 def news_params
   params.require(:news).permit(:topic, :header, :content, :link, :image)
 end
end

我的新闻模型是：

class News < ActiveRecord::Base
    validates :image, presence: true

    has_attached_file :image, styles: { thumb: "64x64#", small: "100x100#", med: "150x150#", large: "200x200# -adaptive-resize" }, default_url: "/images/:style/missing.png"
    validates_attachment_content_type :image, :content_type => /\Aimage\/.*\Z/
end

我的回形针数据库迁移是：

class AddAttachmentImageToNews < ActiveRecord::Migration
  def self.up
    change_table :news do |t|
      t.attachment :image
    end
  end

  def self.down
    remove_attachment :news, :image
  end
end

数据库架构：

  ActiveRecord::Schema.define(version: 20160809173534) do

  create_table "news", force: :cascade do |t|
    t.string   "topic",              limit: 255
    t.string   "header",             limit: 255
    t.string   "content",            limit: 255
    t.string   "link",               limit: 255
    t.datetime "created_at",                     null: false
    t.datetime "updated_at",                     null: false
    t.string   "image_file_name",    limit: 255
    t.string   "image_content_type", limit: 255
    t.integer  "image_file_size",    limit: 4
    t.datetime "image_updated_at"
  end
end

当我 rake db:migrate 这个然后尝试使用它时，我得到了 Paperclip::Error in NewsController#create There was an error processing the thumbnail for dfc9ea4994791a9884f662cfa4333da420160809-29993-12b0k3n。

完全错误：

  Started POST "/news" for 127.0.0.1 at 2016-08-09 13:47:40 -0400
Processing by NewsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"LQOcaS5Nfm63jIBRxjrDrjjrO/3yvKqdAgiwllPsyuZ2gQNbq4USbc+G5Nr6JuBqYZQdO6lFTHBdretDEk3Xrg==", "news"=>{"topic"=>"AutoCAD", "header"=>"News header 1", "content"=>"something should work eventually.", "link"=>"link here", "image"=>#<ActionDispatch::Http::UploadedFile:0x007fd568e25028 @tempfile=#<Tempfile:/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/RackMultipart20160809-47024-131c2mr.jpg>, @original_filename="blockhead.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"news[image]\"; filename=\"blockhead.jpg\"\r\nContent-Type: image/jpeg\r\n">}, "commit"=>"Create News"}
  Linkpost Load (0.4ms)  SELECT `linkposts`.* FROM `linkposts`  ORDER BY title
  Admin Load (0.3ms)  SELECT  `admins`.* FROM `admins` WHERE `admins`.`id` = 1  ORDER BY `admins`.`id` ASC LIMIT 1
Command :: file -b --mime '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-yckinl.jpg'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]'
Command :: convert '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]' -auto-orient -resize "x64" -crop "64x64+0+0" +repage '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/62af5247d7ae99288c3db01615055e6c20160809-47024-1vtevvl'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]'
Command :: convert '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]' -auto-orient -resize "x100" -crop "100x100+0+0" +repage '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/62af5247d7ae99288c3db01615055e6c20160809-47024-1ndlv2i'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]'
Command :: convert '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]' -auto-orient -resize "x150" -crop "150x150+0+0" +repage '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/62af5247d7ae99288c3db01615055e6c20160809-47024-1dpm4bl'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]'
Command :: convert '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a.jpg[0]' -auto-orient -resize "200x200#" '/var/folders/y5/brmnsb2n4f5_mkpmmn_ll_280000gn/T/62af5247d7ae99288c3db01615055e6c20160809-47024-q1w9zr'
Completed 500 Internal Server Error in 815ms (ActiveRecord: 0.6ms)

Paperclip::Error (There was an error processing the thumbnail for dfc9ea4994791a9884f662cfa4333da420160809-47024-t1m52a):
  app/controllers/news_controller.rb:28:in `create'

我之前有一个名为 image 的新闻类的属性，不知道这会不会搞砸什么？

这似乎是一个数据库问题，因为如果我执行 rake db:setup 它工作正常。但是，我不想擦除我的数据库，所以这不是一个选项，因为 db:setup 运行 db:schema:load 这将删除服务器上的数据。

任何帮助或建议将不胜感激。谢谢。

【问题讨论】：

您可以将 :image 更改为 :picture 并使用它吗？但我建议不要同时保留两者。最好先删除以前的 :image 列。然后再次运行 rails paperclip news :image。
@loloso 我会试试的，谢谢。我应该如何删除:image？我应该直接在终端中通过mysql吗？或者使用 Rails 迁移来删除列（我从未做过，但听说过）？
使用 rails g migration remove_image_from_news image:attachment（或任何图像 -check db schema），这将在文件夹 db/migrate 中生成迁移。检查以确保它说从新闻中删除列（它是新闻，对吗？？）。然后 rake db:migrate。然后检查架构以确保新闻表没有图像列。然后运行我上面有你的回形针生成器。现在很难用手机写信向您展示迁移的具体情况，但如果您遇到问题，请告诉我。
@loloso 不幸的是仍然得到相同的Paperclip::Error...
你能发布完整的错误吗？

标签： mysql ruby-on-rails paperclip image-uploading

【解决方案1】：

在news 模型中更改了这一行：

has_attached_file :image, styles: { thumb: "64x64#", small: "100x100#", med: "150x150#", large: "200x200# -adaptive-resize" }

到这里：

has_attached_file :image, styles: { thumb: "64x64#", small: "100x100#", med: "150x150>", large: "200x200>" }

我猜-adaptive-resize 搞砸了，我必须找到一种不同的方法来调整图像大小而不使其变形。

【讨论】：