619d402f92
This task was copied from Thoughtbot's migration guide [1]. They use a migration file, but we usually use rake tasks to migrate data. [1] https://github.com/thoughtbot/paperclip/blob/master/MIGRATING.md
79 lines
2.7 KiB
Ruby
79 lines
2.7 KiB
Ruby
# This code is based on Thoughtbot's guide to migrating from Paperclip
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# to Active Storage:
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# https://github.com/thoughtbot/paperclip/blob/master/MIGRATING.md
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namespace :active_storage do
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desc "Copy paperclip's attachment database columns to active storage"
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task migrate_from_paperclip: :environment do
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logger = ApplicationLogger.new
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get_blob_id = "LASTVAL()"
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ActiveRecord::Base.connection.raw_connection.prepare("active_storage_blob_statement", <<-SQL)
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INSERT INTO active_storage_blobs (
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key, filename, content_type, metadata, byte_size, checksum, created_at
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) VALUES ($1, $2, $3, '{}', $4, $5, $6)
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SQL
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ActiveRecord::Base.connection.raw_connection.prepare("active_storage_attachment_statement", <<-SQL)
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INSERT INTO active_storage_attachments (
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name, record_type, record_id, blob_id, created_at
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) VALUES ($1, $2, $3, #{get_blob_id}, $4)
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SQL
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Rails.application.eager_load!
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models = ActiveRecord::Base.descendants.reject(&:abstract_class?)
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ActiveRecord::Base.transaction do
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models.each do |model|
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attachments = model.column_names.map do |c|
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if c =~ /(.+)_file_name$/
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$1
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end
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end.compact
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if attachments.blank?
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next
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end
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model.find_each.each do |instance|
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attachments.each do |attachment|
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next if instance.send(attachment).path.blank?
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ActiveRecord::Base.connection.raw_connection.exec_prepared(
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"active_storage_blob_statement", [
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SecureRandom.uuid, # Alternatively instance.send("#{attachment}_file_name"),
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instance.send("#{attachment}_file_name"),
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instance.send("#{attachment}_content_type"),
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instance.send("#{attachment}_file_size"),
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Digest::MD5.base64digest(File.read(instance.send(attachment).path)),
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instance.updated_at.iso8601
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])
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ActiveRecord::Base.connection.raw_connection.exec_prepared(
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"active_storage_attachment_statement", [
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attachment,
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model.name,
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instance.id,
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instance.updated_at.iso8601
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])
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end
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end
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end
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end
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ActiveStorage::Attachment.find_each do |attachment|
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name = attachment.name
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source = attachment.record.send(name).path
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dest_dir = File.join(
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"storage",
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attachment.blob.key.first(2),
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attachment.blob.key.first(4).last(2))
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dest = File.join(dest_dir, attachment.blob.key)
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FileUtils.mkdir_p(dest_dir)
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logger.info "Copying #{source} to #{dest}"
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FileUtils.cp(source, dest)
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end
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end
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end
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