为＃<uri :: generic：0x007fe0fb2f6190>获取错误的未定义方法`request_uri'-从回形针迁移到活动存储

Question

我正在尝试从Paperclip迁移到Active Storage，但是在运行迁移时却不断收到未定义方法`request_uri'的错误。这就是我的ConvertToActiveStorage迁移的样子（注意：我首先在开发环境中测试此迁移，该开发环境已连接到我的AWS S3开发存储桶-因此我的文件不在本地）

我猜想这可能与我的S3 URL有关，后者的格式为“ //s3.amazonaws.com / .......”，这与我以“ //”而不是“ https”开头？如果可以，我该如何避免呢？

     Dir[Rails.root.join("app/models/**/*.rb")].sort.each { |file| require file }

 class ConvertToActiveStorage < ActiveRecord::Migration[5.2]
 require 'open-uri'

 def up
   # postgres
   get_blob_id = 'LASTVAL()'
   # mariadb
   # get_blob_id = 'LAST_INSERT_ID()'
   # sqlite
   # get_blob_id = 'LAST_INSERT_ROWID()'

   active_storage_blob_statement = 


ActiveRecord::Base.connection.raw_connection.prepare(' 
active_storage_blob_statement', <<-SQL)
   INSERT INTO active_storage_blobs (
     key, filename, content_type, metadata, byte_size, checksum, created_at
   ) VALUES ($1, $2, $3, '{}', $4, $5, $6)
 SQL

 active_storage_attachment_statement = ActiveRecord::Base.connection.raw_connection.prepare('active_storage_attachment_statement', <<-SQL)
   INSERT INTO active_storage_attachments (
     name, record_type, record_id, blob_id, created_at
   ) VALUES ($1, $2, $3, #{get_blob_id}, $4)
 SQL

models = ActiveRecord::Base.descendants.reject(&:abstract_class?)

transaction do
 models.each do |model|
   attachments = model.column_names.map do |c|
     if c =~ /(.+)_file_name$/
       $1
     end
   end.compact

   model.find_each.each do |instance|
     attachments.each do |attachment|
       if instance.send(attachment).exists?
         active_storage_blob_statement.execute(
           key(instance, attachment),
           instance.send("#{attachment}_file_name"),
           instance.send("#{attachment}_content_type"),
           instance.send("#{attachment}_file_size"),
           checksum(instance.send(attachment)),
           instance.updated_at.iso8601
         )

         active_storage_attachment_statement.
           execute(attachment, model.name, instance.id, instance.updated_at.iso8601)
       end
     end
   end
 end
end

  active_storage_attachment_statement.close
  active_storage_blob_statement.close
end

 def down
   raise ActiveRecord::IrreversibleMigration
 end

 private

 def key(instance, attachment)
   # SecureRandom.uuid
   # Alternatively:
   instance.send("#{attachment}_file_name")
 end

 def checksum(attachment)
   # local files stored on disk:
   # url = attachment.path
   # Digest::MD5.base64digest(File.read(url))

   # remote files stored on another person's computer:
   url = attachment.url
   Digest::MD5.base64digest(Net::HTTP.get(URI(url)))
 end
end