當我使用回形針遷移錯誤發生

Question

運行此命令 => rails generate paperclip photo image

創建遷移文件

class AddAttachmentImageToPhotos < ActiveRecord::Migration[5.1]

  def self.up
    change_table :photos do |t|

      t.attachment :image
    end
  end

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

遷移錯誤

rails db:migrate
== 20210223102018 AddAttachmentImageToPhotos: migrating =======================
-- change_table(:photos)
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:

wrong number of arguments (given 3, expected 2)
/home/rizwan/projects/ClipUploader/db/migrate/20210223102018_add_attachment_image_to_photos.rb:4:in `block in up'
/home/rizwan/projects/ClipUploader/db/migrate/20210223102018_add_attachment_image_to_photos.rb:3:in `up'
/home/rizwan/projects/ClipUploader/bin/rails:5:in `<top (required)>'
/home/rizwan/projects/ClipUploader/bin/spring:10:in `block in <top (required)>'
/home/rizwan/projects/ClipUploader/bin/spring:7:in `<top (required)>'

Caused by:
ArgumentError: wrong number of arguments (given 3, expected 2)
/home/rizwan/projects/ClipUploader/db/migrate/20210223102018_add_attachment_image_to_photos.rb:4:in `block in up'
/home/rizwan/projects/ClipUploader/db/migrate/20210223102018_add_attachment_image_to_photos.rb:3:in `up'
/home/rizwan/projects/ClipUploader/bin/rails:5:in `<top (required)>'
/home/rizwan/projects/ClipUploader/bin/spring:10:in `block in <top (required)>'
/home/rizwan/projects/ClipUploader/bin/spring:7:in `<top (required)>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

Answer 1

我有同樣的問題，我通過如下更改遷移解決了它，

class AddAttachmentImageToPhotos < ActiveRecord::Migration[5.1]

  def self.up
    add_attachment :photos, :image
  end

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

Answer 2

當使用使用 PaperClip 的 Ruby 3 從 Rails 5 升級到 6.1 時，我遇到了類似的問題。 不確定是什么導致了問題，但像正常遷移一樣添加列會有所幫助。

  class AddLogoColumnsToUsers < ActiveRecord::Migration[6.1]
    def up
       add_column :users, :logo_file_name, :string
       add_column :users, :logo_file_size, :integer
       add_column :users, :logo_content_type, :string
       add_column :users, :logo_updated_at, :datetime
    end

    def down
       remove_column :users, :logo_file_name, :string
       remove_column :users, :logo_file_size, :integer
       remove_column :users, :logo_content_type, :string
       remove_column :users, :logo_updated_at, :datetime
    end
  end

Answer 3

您可以使用https://github.com/kreeti/kt-paperclip來存儲圖像。 非常適合我。 我也陷入了同樣的錯誤，但現在工作正常。