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ActiveRecord::Migration is not supportedの時

Posted at 2020-05-17

#原因
StandardError: Directly inheriting from ActiveRecord::Migration is not supported. Please specify the Rails release the migration was written for:

#対処法
新しく生成されたMigrationファイルにバージョンをつける、下記例：

xxx_add_attachment_image_to_photos.rb

class AddAttachmentImageToPhotos < ActiveRecord::Migration[5.2]