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ruby-on-rails – Rails 4.2.6 Polymorphic Carrierwave 0.10条

发布时间：2020-12-17 01:56:32 所属栏目：百科 来源：网络整理
导读：我有图片模型,它存储整个应用程序中的图片,在可成像列我存储图像所有者对象.我希望能够以不同的分辨率保存这些图片. class Picture AbstractModel belongs_to :imageable,polymorphic: true mount_uploader :image,ImageUploaderendclass User AbstractModel
我有图片模型,它存储整个应用程序中的图片,在可成像列我存储图像所有者对象.我希望能够以不同的分辨率保存这些图片. 

class Picture < AbstractModel
  belongs_to :imageable,polymorphic: true
  mount_uploader :image,ImageUploader
end

class User < AbstractModel
  has_one :picture,class_name: Picture,as: :imageable,dependent: :destroy
  accepts_nested_attributes_for :picture
end

class Event < AbstractModel
  has_one :picture,dependent: :destroy
  accepts_nested_attributes_for :picture
end

在Carrierwave我做过

class ImageUploader < CarrierWave::Uploader::Base
  version :xs if: :for_user? do
    process resize_to_fit: [100,100]
  end

  private

    def for_user?(_picture)
      # And here I hit the problem!
      # model.is_a? User
    end
end

我如何在这里获取图片所有者模型？

在图片模型上模型变量引用,我已经用pry尝试了所有变量,但没有成功.

当然我可以直接在这个片段中的用户和事件中存储图像链接,但是,在realworld代码中,我有大约15个使用图像的不同模型,我必须提供在ActiveAdmin CMS中编辑它的能力(但它是另一个故事:)

UPDATE

当我创建新记录时,主要问题就出现了.所以,我试图添加inverse_of,但它没有帮助.

class Picture < AbstractModel
  belongs_to :imageable,polymorphic: true,inverse_of: :pictures
  mount_uploader :image,ImageUploader

class User < AbstractModel
  has_one :picture,dependent: :destroy,inverse_of: :imageable
  accepts_nested_attributes_for :picture

这是for_user中的模型状态？方法

[5] pry(#<ImageUploader>)> ap model
Изображение для  {
                :id => nil,:image => #<ImageUploader:0x005583dee8f938 @model=#<Picture id: nil,image: nil,imageable_id: nil,imageable_type: nil,created_at: nil,updated_at: nil>,@mounted_as=:image,@cache_id="1463023347-21567-5096",@filename="rootp_HE_pause-20160113_141810.jpg",@original_filename="rootp_HE_pause-20160113_141810.jpg",@file=#<CarrierWave::SanitizedFile:0x005583dee8cf30 @file="/home/kvokka/proj/volunteers/public/uploads/tmp/1463023347-21567-5096/rootp_HE_pause-20160113_141810.jpg",@original_filename=nil,@content_type="image/jpeg">,@versions={:mini=>#<ImageUploader::Uploader47012442238420:0x005583dee724a0 @model=#<Picture id: nil,@mounted_as=:image>,:xs=>#<ImageUploader::Uploader47012435752020:0x005583dee72450 @model=#<Picture id: nil,:avatar=>#<ImageUploader::Uploader47012437005860:0x005583dee72428 @model=#<Picture id: nil,@mounted_as=:image>}>,:imageable_id => nil,:imageable_type => nil,:created_at => nil,:updated_at => nil

UPDATE2

我用inverse_of :: picture和inverse_of :: pictures进行了争吵.语法错误.它使用inverse_of :: imageable运行,但结果是相同的.

最后一个版本的ImageUploader(我为了简洁而剪了它)

class ImageUploader < CarrierWave::Uploader::Base
  version :xs do
    process resize_to_fit: [100,100]
  end

  version :avatar,if: :for_user? do
    process resize_to_fit: [360,360]
  end

  private

    def for_user?(_)
      model.imageable.is_a? User
    end
end

UPDATE3

我做了一些控制台移动,所以你可以看到,该模型接受嵌套属性.在has_one关系的情况下,它也可以在没有#inverse_of方法的情况下工作(这一刻对我来说很棘手).所以,日志：

[43] pry(main)> ap v = VolunteerCenter.create(title: 'tst',address:'tst',city: City.first,phone:'123456',email: 'mm@mm.ru',description: 'ololo',link: 'http://ddd.ru',picture: (Picture.new( remote_image_url: 'https://retina.news.mail.ru/prev780x440/pic/e5/35/image25749462_adfc024a9b54b718c1a755445661b099.jpg')))
  City Load (0.8ms)  SELECT  "cities".* FROM "cities"  ORDER BY "cities"."id" ASC LIMIT 1
   (0.2ms)  BEGIN
  SQL (0.4ms)  INSERT INTO "volunteer_centers" ("title","address","city_id","phone","email","description","link","created_at","updated_at") VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9) RETURNING "id"  [["title","tst"],["address",["city_id",1],["phone","123456"],["email","mm@mm.ru"],["description","ololo"],["link","http://ddd.ru"],["created_at","2016-05-12 12:13:44.417945"],["updated_at","2016-05-12 12:13:44.417945"]]
  SQL (0.3ms)  INSERT INTO "pictures" ("image","imageable_type","imageable_id",$5) RETURNING "id"  [["image","image25749462_adfc024a9b54b718c1a755445661b099.jpg"],["imageable_type","VolunteerCenter"],["imageable_id",11],"2016-05-12 12:13:44.421458"],"2016-05-12 12:13:44.421458"]]
   (2.2ms)  COMMIT
tst {
             :id => 11,:title => "tst",:created_at => Thu,12 May 2016 12:13:44 UTC +00:00,:updated_at => Thu,:address => "tst",:city_id => 1,:phone => "123456",:email => "mm@mm.ru",:description => "ololo",:vk_link => nil,:link => "http://ddd.ru"
}
=> nil
[44] pry(main)> ap v.picture
  VolunteerCenter Load (0.6ms)  SELECT  "volunteer_centers".* FROM "volunteer_centers" WHERE "volunteer_centers"."id" = $1 LIMIT 1  [["id",11]]
Изображение для tst {
                :id => 120,:image => #<ImageUploader:0x0055596544d928 @model=#<Picture id: 120,image: "image25749462_adfc024a9b54b718c1a755445661b099.jpg",imageable_id: 11,imageable_type: "VolunteerCenter",created_at: "2016-05-12 12:13:44",updated_at: "2016-05-12 12:13:44">,@cache_id=nil,@filename="image25749462_adfc024a9b54b718c1a755445661b099.jpg",@original_filename="image25749462_adfc024a9b54b718c1a755445661b099.jpg",@file=#<CarrierWave::SanitizedFile:0x00555963f0c690 @file="/home/kvokka/proj/volunteers/public/uploads/picture/image/120/image25749462_adfc024a9b54b718c1a755445661b099.jpg",@versions={:mini=>#<ImageUploader::Uploader46921211280280:0x00555966c55890 @model=#<Picture id: 120,@parent_cache_id="1463055224-8966-4735",@file=#<CarrierWave::SanitizedFile:0x00555966e89620 @file="/home/kvokka/proj/volunteers/public/uploads/picture/image/120/mini_image25749462_adfc024a9b54b718c1a755445661b099.jpg",@versions={},@storage=#<CarrierWave::Storage::File:0x00555966e8a4a8 @uploader=#<ImageUploader::Uploader46921211280280:0x00555966c55890 ...>>>,:xs=>#<ImageUploader::Uploader46921211274220:0x00555966c55868 @model=#<Picture id: 120,@file=#<CarrierWave::SanitizedFile:0x005559659d60c0 @file="/home/kvokka/proj/volunteers/public/uploads/picture/image/120/xs_image25749462_adfc024a9b54b718c1a755445661b099.jpg",@storage=#<CarrierWave::Storage::File:0x005559659d7010 @uploader=#<ImageUploader::Uploader46921211274220:0x00555966c55868 ...>>>,:avatar==>#<ImageUploader::Uploader46921211257860:0x00555966c55840 @model=#<Picture id: 120,@file=#<CarrierWave::SanitizedFile:0x00555963379328 @file="/home/kvokka/proj/volunteers/public/uploads/picture/image/120/avatar=_image25749462_adfc024a9b54b718c1a755445661b099.jpg",@storage=#<CarrierWave::Storage::File:0x0055596337a390 @uploader=#<ImageUploader::Uploader46921211257860:0x00555966c55840 ...>>>},@storage=#<CarrierWave::Storage::File:0x00555965d85fb8 @uploader=#<ImageUploader:0x0055596544d928 ...>>>,:imageable_id => 11,:imageable_type => "VolunteerCenter",12 May 2016 12:13:44 UTC +00:00
}

UPDATE4

当我在回调方法中使用pry运行时会发生这种情况.

class ImageUploader < CarrierWave::Uploader::Base
  version :avatar,if: :for_user? do
    puts 'This line never run'
    process resize_to_fit: [360,360]
  end

  private

    def for_user?(picture)
      binding.pry
      model.imageable.is_a? User
    end

我关闭所有验证以澄清.
此回调被调用3次,并且在前2个用户实例未准备就绪,并且在最后一个回调之后,回调不起作用.

[46] pry(main)> ap u = User.create(email: 'example@test.com',password: '123456',password_confirmation: '123456',picture: (Picture.create remote_image_url: 'http://onrails.club/uploads/default/29/31f7627609164af8.png'))

From: /home/kvokka/proj/volunteers/app/uploaders/image_uploader.rb @ line 68 ImageUploader#for_user?:

    66: def for_user?(_)
    67:   binding.pry
 => 68:   model.imageable.is_a? User
    69: end

@cache_id                "1463060913-8966-3349"
@file                    #<CarrierWave::SanitizedFile:0x00555963268330 @file="/hom...
@filename                "31f7627609164af8.png"
@model                   #<Picture id: nil,imageab...
@mounted_as              :image
@original_filename       "31f7627609164af8.png"
@versions                {:mini=>#<ImageUploader::Uploader46921199022860:0x0055596...
[1] pry(#<ImageUploader>)> 

From: /home/kvokka/proj/volunteers/app/uploaders/image_uploader.rb @ line 68 ImageUploader#for_user?:

    66: def for_user?(_)
    67:   binding.pry
 => 68:   model.imageable.is_a? User
    69: end

@cache_id                "1463060913-8966-3349"
@file                    #<CarrierWave::SanitizedFile:0x00555963268330 @file="/hom...
@filename                "31f7627609164af8.png"
@model                   #<Picture id: nil,imageab...
@mounted_as              :image
@original_filename       "31f7627609164af8.png"
@versions                {:mini=>#<ImageUploader::Uploader46921199022860:0x0055596...
[1] pry(#<ImageUploader>)> 
   (0.3ms)  BEGIN
  SQL (0.7ms)  INSERT INTO "pictures" ("image",$3) RETURNING "id"  [["image","31f7627609164af8.png"],"2016-05-12 13:48:40.071387"],"2016-05-12 13:48:40.071387"]]

From: /home/kvokka/proj/volunteers/app/uploaders/image_uploader.rb @ line 68 ImageUploader#for_user?:

    66: def for_user?(_)
    67:   binding.pry
 => 68:   model.imageable.is_a? User
    69: end

@cache_id                nil
@file                    #<CarrierWave::SanitizedFile:0x005559639c6348 @file="/hom...
@filename                "31f7627609164af8.png"
@model                   #<Picture id: 112,image: "31f7627609164af8.png",imageab...
@mounted_as              :image
@original_filename       "31f7627609164af8.png"
@storage                 #<CarrierWave::Storage::File:0x00555963b5add0 @uploader=#...
@versions                {:mini=>#<ImageUploader::Uploader46921199022860:0x0055596...
[1] pry(#<ImageUploader>)> 
   (2.9ms)  COMMIT
   (0.2ms)  BEGIN
  User Exists (0.7ms)  SELECT  1 AS one FROM "users" WHERE "users"."email" = 'example@test.com' LIMIT 1
  SQL (0.4ms)  INSERT INTO "users" ("email","encrypted_password",$4) RETURNING "id"  [["email","example@test.com"],["encrypted_password","$2a$11$qq8tVgzISJguKz7oVJWyVO45vW/ujSEsi/ow29w78nC9ByOdjrPYK"],"2016-05-12 13:48:41.761836"],"2016-05-12 13:48:41.761836"]]
  SQL (0.4ms)  UPDATE "pictures" SET "imageable_type" = $1,"imageable_id" = $2,"updated_at" = $3 WHERE "pictures"."id" = $4  [["imageable_type","User"],31],"2016-05-12 13:48:41.764681"],["id",112]]
   (2.7ms)  COMMIT,{
                           :id => 31,:email => "example@test.com",:encrypted_password => "$2a$11$qq8tVgzISJguKz7oVJWyVO45vW/ujSEsi/ow29w78nC9ByOdjrPYK",:reset_password_token => nil,:reset_password_sent_at => nil,:remember_created_at => nil,:sign_in_count => 0,:current_sign_in_at => nil,:last_sign_in_at => nil,:current_sign_in_ip => nil,:last_sign_in_ip => nil,12 May 2016 13:48:41 UTC +00:00,:name => nil,:surname => nil,:phone => nil,:dob => nil,:gender => nil,:height => nil,:about => nil,:information_source_id => nil,:institution_id => nil,:clothes_size_id => nil,:city_id => nil,:volunteer_center_id => nil,:blood_id => nil,:vkontakte_link => nil,:medical_contraindications => nil
}
=> nil

问题仍然存在

解决方法

How I can fetch the picture owner model here?

当您说“图片所有者模型”时,假设您指的是用户记录,那么您可以执行以下操作

class ImageUploader < CarrierWave::Uploader::Base
  ...
  def for_user?(picture)
    user = model.imageable
    user.is_a? User
    # => true
  end
  ...
end

从docs开始：

> picture参数是要上传的文件对象(这不是Picture模型的实例)
> model是对使用此ImageUploader的实例对象的引用,在您的情况下,它指的是Picture模型的实例.请注意,这与上图不同.

既然你知道模型是Picture的一个实例,那个Picture belongs_to：imageable,那个：imageable是一个多态关联,实际上是你的案例中的用户记录,那么你可以用上面的答案访问相关的记录.但请注意,它可能并不总是用户记录,因为它是多态关联.

UPDATE

我猜测model.imageable无效,因为从嵌套参数设置后可成像记录为零.

你能试一下吗

class Picture < AbstractModel
  belongs_to :imageable,inverse_of: :picture # WITHOUT s

UPDATE

看起来像inverse_of不适用于多态关联(here和here)

There are a few limitations to inverse_of support:

  • They do not work with :through associations.
  • They do not work with :polymorphic associations.
  • They do not work with :as associations.
  • For belongs_to associations,has_many inverse associations are ignored.

附：这可能很棘手.如果我有时间,我会尝试重现问题.

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