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Ash DataLayer for Neo4j

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ash_neo4j lib transformers transform_default_relate.ex
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lib/transformers/transform_default_relate.ex 

# SPDX-FileCopyrightText: 2025 ash_neo4j contributors <https://github.com/diffo-dev/ash_neo4j/graphs.contributors>

#

# SPDX-License-Identifier: MIT



defmodule AshNeo4j.Transformers.TransformDefaultRelate do

  @moduledoc false

  use Spark.Dsl.Transformer

  alias Spark.Dsl.Transformer

  alias Spark.Dsl.Verifier



  @impl true

  def transform(dsl) do

    relationships = Verifier.get_entities(dsl, [:relationships])

    relate = Verifier.get_option(dsl, [:neo4j], :relate, [])



    default_relate =

      Enum.reduce(relationships, [], fn relationship, acc ->

        if List.keyfind(relate, relationship.name, 0) do

          acc

        else

          edge_label = String.to_atom(String.upcase(Atom.to_string(relationship.type)))

          dest_label = String.to_atom(List.last(Module.split(relationship.destination)))

          [{relationship.name, edge_label, :outgoing, dest_label} | acc]

        end

      end)



    transformed_relate = relate ++ default_relate



    {:ok, Transformer.set_option(dsl, [:neo4j], :relate, transformed_relate)}

  end

end