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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 tree_path.ex
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examples/ct_ecto/lib/ct/tree_path.ex 

defmodule CT.TreePath do

  use Ecto.Schema



  import Ecto.Changeset



  alias CT.Comment



  @primary_key false



  schema "tree_paths" do

    belongs_to :parent_comment, Comment, foreign_key: :ancestor

    belongs_to :comment, Comment, foreign_key: :descendant

    field :depth, :integer

  end



  def changeset(path, params \\ %{}) do

    path

    |> cast(params, [:ancestor, :descendant, :depth])

    |> validate_number(:ancestor, greater_than_or_equal_to: 0)

    |> validate_number(:descendant, greater_than_or_equal_to: 0)

  end

end