location.ex

defimpl Ecto.DataType, for: Map do
  def cast(%{lat: lat, long: long}, Geo.Point), do: cast(%{"lat" => lat, "long" => long}, Geo.Point)
  def cast(%{"lat" => lat, "long" => long}, Geo.Point) do
    {:ok, %Geo.Point{coordinates: {long, lat}, srid: 4326}}
  end
  def cast(arg1, arg2) do
    :error
  end

  def dump(%Geo.Point{} = point), do: {:ok, point}
end