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active_memory

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The typed, attribute-queryable in-memory store for ETS and Mnesia, with Ecto changeset support, record expiry (TTL), crash resilience, and atomic take-once reads.

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active_memory lib query match_guards.ex
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lib/query/match_guards.ex 

defmodule ActiveMemory.Query.MatchGuards do
  @moduledoc false

  def build(table, query_map) do
    table.__attributes__(:query_fields)
    |> validate_query(query_map)
    |> build_match_tuple(query_map)
  end

  defp validate_query(attributes, query_map) do
    case Enum.all?(query_map, fn {key, _value} -> Enum.member?(attributes, key) end) do
      true -> {:ok, attributes}
      false -> {:error, :query_schema_mismatch}
    end
  end

  defp build_match_tuple({:ok, attributes}, query_map) do
    query =
      attributes
      |> Enum.into([], fn key -> Map.get(query_map, key, :_) end)
      |> List.to_tuple()

    {:ok, query}
  end

  defp build_match_tuple(error, _keywords), do: error
end