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closure_table

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Closure Table for Elixir - a simple solution for storing and manipulating complex hierarchies.

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closure_table examples ct_ecto lib ct.ex
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examples/ct_ecto/lib/ct.ex 

defmodule CT do

  @moduledoc false



  alias CT.{MyCTE, Repo, Author, Comment, TreePath}

  alias Ecto.Multi



  def get(schema, query) do

    Repo.get_by(schema, query)

  end



  @spec comment(String.t(), Author.t()) :: {:ok}

  def comment(comment, %Author{} = author) do

    comment = Comment.changeset(%{text: comment}, author)



    Multi.new()

    |> Multi.insert(:comment, comment)

    |> Multi.run(:tree, &insert_node/2)

    |> Repo.transaction()

  end



  defp insert_node(_repo, %{comment: comment} = changes) do

    CH.insert(comment.id, comment.id)

    {:ok, [[comment.id, comment.id]]}

  end

end