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mastodon/db/migrate/20170105224407_add_shortcode_to_media_attachments.rb

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class AddShortcodeToMediaAttachments < ActiveRecord::Migration[5.0]
def up
add_column :media_attachments, :shortcode, :string, null: true, default: nil
add_index :media_attachments, :shortcode, unique: true
# Migrate old links
MediaAttachment.local.update_all('shortcode = id')
end
def down
remove_index :media_attachments, :shortcode
remove_column :media_attachments, :shortcode
end
end