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query_builder

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Compose Ecto queries without effort

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query_builder lib query helper.ex
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lib/query/helper.ex 

defmodule QueryBuilder.Query.Helper do

  @moduledoc false



  def field_and_binding(query, token, field) do

    split_field = String.split(to_string(field), "@")

    [field, assoc_field] = [Enum.at(split_field, 0), Enum.at(split_field, 1)]



    field = String.to_existing_atom(field)

    assoc_field = String.to_existing_atom(assoc_field || "nil")



    _field_and_binding(query, token, [field, assoc_field])

  end



  defp _field_and_binding(query, _token, [field, nil]) do

    {field, QueryBuilder.Utils.root_schema(query)}

  end



  defp _field_and_binding(_query, token, [field, assoc_field]) do

    {:ok, binding} = find_binding_for_assoc_field(assoc_field, token)

    {field, binding}

  end



  defp find_binding_for_assoc_field(_assoc_field, []), do: {:error, :not_found}



  defp find_binding_for_assoc_field(assoc_field, [assoc_data | tail]) do

    if assoc_field == Map.fetch!(assoc_data, :assoc_field) do

      {:ok, assoc_data.assoc_binding}

    else

      find_binding_for_assoc_field(assoc_field, assoc_data.nested_assocs) ||

        find_binding_for_assoc_field(assoc_field, tail)

    end

  end

end