myapp/db/migrate/20191126063911_add_foreign_key_constraint_to_active_storage_attachments_for_blob_id.active_storage.rb
# frozen_string_literal: true
# This migration comes from active_storage (originally 20180723000244)
class AddForeignKeyConstraintToActiveStorageAttachmentsForBlobId < ActiveRecord::Migration[6.0]
def up
return if foreign_key_exists?(:active_storage_attachments, column: :blob_id)
return unless table_exists?(:active_storage_blobs)
add_foreign_key :active_storage_attachments, :active_storage_blobs, column: :blob_id
end
end