db/migrate/20200312185443_add_parent_id_to_email_domain_blocks.rb


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class AddParentIdToEmailDomainBlocks < ActiveRecord::Migration[5.2]
  def change
    add_reference :email_domain_blocks, :parent, null: true, default: nil, foreign_key: { on_delete: :cascade, to_table: :email_domain_blocks }, index: false
  end
end