activestorage/db/update_migrate/20180723000244_add_foreign_key_constraint_to_active_storage_attachments_for_blob_id.rb


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class AddForeignKeyConstraintToActiveStorageAttachmentsForBlobId < ActiveRecord::Migration[6.0]
  def up
    return if foreign_key_exists?(:active_storage_attachments, column: :blob_id)

    if table_exists?(:active_storage_attachments) && table_exists?(:active_storage_blobs)
      add_foreign_key :active_storage_attachments, :active_storage_blobs, column: :blob_id
    end
  end
end