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paper_trail

0.8.2
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Track and record all the changes in your database. Revert back to anytime in history.

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paper_trail lib mix tasks papertrail install.ex
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lib/mix/tasks/papertrail/install.ex 

defmodule Mix.Tasks.Papertrail.Install do

  @shortdoc "generates paper_trail migration file for your database"



  use Mix.Task



  import Macro, only: [underscore: 1]

  import Mix.Generator



  def run(_args) do

    path = Path.relative_to("priv/repo/migrations", Mix.Project.app_path())

    file = Path.join(path, "#{timestamp()}_#{underscore(AddVersions)}.exs")

    create_directory(path)



    create_file(file, """

    defmodule Repo.Migrations.AddVersions do

      use Ecto.Migration



      def change do

        create table(:versions) do

          add :event,        :string, null: false, size: 10

          add :item_type,    :string, null: false

          add :item_id,      :integer

          add :item_changes, :map, null: false

          add :originator_id, references(:users) # you can change :users to your own foreign key constraint

          add :origin,       :string, size: 50

          add :meta,         :map



          add :inserted_at,  :utc_datetime, null: false

        end



        create index(:versions, [:originator_id])

        create index(:versions, [:item_id, :item_type])

        # Uncomment if you want to add the following indexes to speed up special queries:

        # create index(:versions, [:event, :item_type])

        # create index(:versions, [:item_type, :inserted_at])

      end

    end

    """)

  end



  defp timestamp do

    {{y, m, d}, {hh, mm, ss}} = :calendar.universal_time()

    "#{y}#{pad(m)}#{pad(d)}#{pad(hh)}#{pad(mm)}#{pad(ss)}"

  end



  defp pad(i) when i < 10, do: <<?0, ?0 + i>>

  defp pad(i), do: to_string(i)

end