add migration to standard as documents plugin is enabled by default

Author: yksflip

db/migrate/20240306141647_move_documents_to_active_storage.rb

@@ -0,0 +1,45 @@
+class MoveDocumentsToActiveStorage < ActiveRecord::Migration[7.0]
+  def up
+    change_table :documents do |t|
+      t.boolean :folder, default: false, null: false
+    end
+
+    Document.find_each do |document|
+      if document.data.present? && document.mime.present?
+        document.attachment.attach(create_blob_from_document(document))
+      else
+        document.update(folder: true)
+      end
+    end
+
+    change_table :documents, bulk: true do |t|
+      t.remove :data
+      t.remove :mime
+    end
+  end
+
+  def down
+    change_table :documents, bulk: true do |t|
+      t.binary :data, limit: 16.megabyte
+      t.string :mime
+      t.remove :folder
+    end
+
+    Document.find_each do |document|
+      next unless document.attachment.attached?
+
+      document.update(
+        data: document.attachment.download,
+        mime: document.attachment.blob.content_type
+      )
+    end
+  end
+
+  def create_blob_from_document(document)
+    ActiveStorage::Blob.create_and_upload!(
+      io: StringIO.new(document.data),
+      filename: document.name,
+      content_type: document.mime
+    )
+  end
+end