39 lines
1.2 KiB
Elixir
39 lines
1.2 KiB
Elixir
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defmodule MobilizonWeb.Schema.Custom.Point do
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@moduledoc """
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The geom scalar type allows Geo.PostGIS.Geometry strings to be passed in and out.
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Requires `{:geo, "~> 3.0"},` package: https://github.com/elixir-ecto/ecto
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"""
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use Absinthe.Schema.Notation
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scalar :point, name: "Point" do
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description("""
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The `Point` scalar type represents Point geographic information compliant string data,
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represented as floats separated by a semi-colon. The geodetic system is WGS 84
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""")
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serialize(&encode/1)
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parse(&decode/1)
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end
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@spec decode(Absinthe.Blueprint.Input.String.t()) :: {:ok, term()} | :error
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@spec decode(Absinthe.Blueprint.Input.Null.t()) :: {:ok, nil}
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defp decode(%Absinthe.Blueprint.Input.String{value: value}) do
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with [_, _] = lonlat <- String.split(value, ";", trim: true),
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[{lon, ""}, {lat, ""}] <- Enum.map(lonlat, &Float.parse(&1)) do
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{:ok, %Geo.Point{coordinates: {lon, lat}, srid: 4326}}
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else
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_ -> :error
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end
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end
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defp decode(%Absinthe.Blueprint.Input.Null{}) do
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{:ok, nil}
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end
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defp decode(_) do
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:error
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end
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defp encode(%Geo.Point{coordinates: {lon, lat}, srid: 4326}), do: "#{lon};#{lat}"
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end
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