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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 comment.ex
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examples/ct_ecto/lib/ct/comment.ex 

defmodule CT.Comment do

  use Ecto.Schema

  import Ecto.Changeset



  @timestamps_opts [type: :utc_datetime]



  schema "comments" do

    field :text, :string

    belongs_to :author, CT.Author



    timestamps()

  end



  def changeset(params \\ %{}, %CT.Author{} = author) do

    %CT.Comment{}

    |> cast(params, [:text])

    |> validate_required(:text)

    |> validate_length(:text, min: 5)

    |> put_assoc(:author, author)

    |> foreign_key_constraint(:author_id, message: "unknown author")

  end

end