<commit_before>class RemoveContactEmailFromBook < ActiveRecord::Migration[5.1]
  def change
    remove_column :books, :contact_email
  end
end
<commit_msg>add type to remove_column migration<commit_after>class RemoveContactEmailFromBook < ActiveRecord::Migration[5.1]
  def change
    remove_column :books, :contact_email, :string
  end
end

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