Graham McIntire
dea407c8ca
ERA5 (Copernicus CDS API): - Era5Profile schema matching HRRR profile structure for interop - Era5Client with async job submission, polling, GRIB2 download - Era5FetchWorker (Oban queue: era5, max_attempts: 5) - Unified lookup: Weather.best_profile_for_contact/1 tries HRRR first, falls back to ERA5 for pre-2014 contacts RTMA (NOAA S3, 2.5km/15-min): - RtmaObservation schema for surface-only fields - RtmaClient with byte-range GRIB2 requests (same pattern as HRRR) - RtmaFetchWorker (Oban queue: rtma, max_attempts: 10) - Weather.find_nearest_rtma/3 for surface condition lookup Both queues added to production Oban config (2 workers each).
704 lines
21 KiB
Elixir
704 lines
21 KiB
Elixir
defmodule Microwaveprop.Weather do
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@moduledoc false
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import Ecto.Query
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alias Microwaveprop.Repo
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alias Microwaveprop.Weather.Era5Profile
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alias Microwaveprop.Weather.HrrrProfile
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alias Microwaveprop.Weather.IemClient
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alias Microwaveprop.Weather.IemreObservation
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alias Microwaveprop.Weather.RtmaObservation
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alias Microwaveprop.Weather.SolarIndex
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alias Microwaveprop.Weather.Sounding
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alias Microwaveprop.Weather.Station
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alias Microwaveprop.Weather.SurfaceObservation
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alias Microwaveprop.Weather.WeatherLayers
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require Logger
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# Approximate km per degree latitude
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@km_per_deg_lat 111.0
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def find_or_create_station(attrs) do
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code = attrs[:station_code] || attrs["station_code"]
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type = attrs[:station_type] || attrs["station_type"]
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if code && type do
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case Repo.get_by(Station, station_code: code, station_type: type) do
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nil ->
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%Station{}
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|> Station.changeset(attrs)
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|> Repo.insert()
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station ->
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{:ok, station}
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end
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else
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%Station{}
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|> Station.changeset(attrs)
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|> Repo.insert()
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end
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end
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def upsert_surface_observation(%Station{} = station, attrs) do
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attrs = Map.put(attrs, :station_id, station.id)
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%SurfaceObservation{}
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|> SurfaceObservation.changeset(attrs)
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|> Repo.insert(
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on_conflict:
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from(s in SurfaceObservation,
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update: [
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set: [
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temp_f: fragment("EXCLUDED.temp_f"),
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dewpoint_f: fragment("EXCLUDED.dewpoint_f"),
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relative_humidity: fragment("EXCLUDED.relative_humidity"),
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wind_speed_kts: fragment("EXCLUDED.wind_speed_kts"),
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sea_level_pressure_mb: fragment("EXCLUDED.sea_level_pressure_mb"),
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sky_condition: fragment("EXCLUDED.sky_condition"),
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precip_1h_in: fragment("EXCLUDED.precip_1h_in"),
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wx_codes: fragment("EXCLUDED.wx_codes"),
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updated_at: fragment("EXCLUDED.updated_at")
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]
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],
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where:
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s.temp_f != fragment("EXCLUDED.temp_f") or
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s.dewpoint_f != fragment("EXCLUDED.dewpoint_f") or
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s.relative_humidity != fragment("EXCLUDED.relative_humidity") or
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s.wind_speed_kts != fragment("EXCLUDED.wind_speed_kts") or
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s.sea_level_pressure_mb != fragment("EXCLUDED.sea_level_pressure_mb")
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),
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conflict_target: [:station_id, :observed_at],
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returning: true,
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stale_error_field: :id
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)
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end
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def upsert_sounding(%Station{} = station, attrs) do
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attrs = Map.put(attrs, :station_id, station.id)
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%Sounding{}
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|> Sounding.changeset(attrs)
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|> Repo.insert(
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on_conflict:
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from(s in Sounding,
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update: [
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set: [
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profile: fragment("EXCLUDED.profile"),
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level_count: fragment("EXCLUDED.level_count"),
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surface_pressure_mb: fragment("EXCLUDED.surface_pressure_mb"),
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surface_temp_c: fragment("EXCLUDED.surface_temp_c"),
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surface_dewpoint_c: fragment("EXCLUDED.surface_dewpoint_c"),
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surface_refractivity: fragment("EXCLUDED.surface_refractivity"),
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min_refractivity_gradient: fragment("EXCLUDED.min_refractivity_gradient"),
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boundary_layer_depth_m: fragment("EXCLUDED.boundary_layer_depth_m"),
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precipitable_water_mm: fragment("EXCLUDED.precipitable_water_mm"),
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k_index: fragment("EXCLUDED.k_index"),
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lifted_index: fragment("EXCLUDED.lifted_index"),
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ducting_detected: fragment("EXCLUDED.ducting_detected"),
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duct_characteristics: fragment("EXCLUDED.duct_characteristics"),
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updated_at: fragment("EXCLUDED.updated_at")
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]
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],
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where:
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s.level_count != fragment("EXCLUDED.level_count") or
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s.surface_temp_c != fragment("EXCLUDED.surface_temp_c") or
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s.surface_refractivity != fragment("EXCLUDED.surface_refractivity")
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),
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conflict_target: [:station_id, :observed_at],
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returning: true,
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stale_error_field: :id
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)
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end
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def upsert_solar_index(attrs) do
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%SolarIndex{}
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|> SolarIndex.changeset(attrs)
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|> Repo.insert(
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on_conflict:
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from(s in SolarIndex,
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update: [
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set: [
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sfi: fragment("EXCLUDED.sfi"),
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sfi_adjusted: fragment("EXCLUDED.sfi_adjusted"),
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sunspot_number: fragment("EXCLUDED.sunspot_number"),
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ap_index: fragment("EXCLUDED.ap_index"),
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kp_values: fragment("EXCLUDED.kp_values"),
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updated_at: fragment("EXCLUDED.updated_at")
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]
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],
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where:
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s.sfi != fragment("EXCLUDED.sfi") or
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s.ap_index != fragment("EXCLUDED.ap_index")
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),
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conflict_target: [:date],
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returning: true,
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stale_error_field: :id
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)
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end
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def has_surface_observations?(station_id, start_dt, end_dt) do
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SurfaceObservation
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|> where([o], o.station_id == ^station_id)
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|> where([o], o.observed_at >= ^start_dt and o.observed_at <= ^end_dt)
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|> Repo.exists?()
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end
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@doc "Returns a MapSet of station_ids that have surface observations in the time window."
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def station_ids_with_surface_observations(station_ids, start_dt, end_dt) do
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SurfaceObservation
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|> where([o], o.station_id in ^station_ids)
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|> where([o], o.observed_at >= ^start_dt and o.observed_at <= ^end_dt)
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|> select([o], o.station_id)
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|> distinct(true)
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|> Repo.all()
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|> MapSet.new()
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end
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def has_sounding?(station_id, observed_at) do
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Sounding
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|> where([s], s.station_id == ^station_id and s.observed_at == ^observed_at)
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|> Repo.exists?()
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end
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@doc "Returns a MapSet of {station_id, observed_at} tuples that have soundings."
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def station_ids_with_soundings(station_ids, sounding_times) do
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Sounding
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|> where([s], s.station_id in ^station_ids and s.observed_at in ^sounding_times)
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|> select([s], {s.station_id, s.observed_at})
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|> distinct(true)
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|> Repo.all()
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|> MapSet.new()
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end
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@doc "Batch upsert solar indices using insert_all in chunks of 500."
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def upsert_solar_indices_batch(records) do
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now = DateTime.truncate(DateTime.utc_now(), :second)
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records
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|> Enum.chunk_every(500)
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|> Enum.reduce(0, fn chunk, acc ->
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entries =
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Enum.map(chunk, fn attrs ->
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%{
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id: Ecto.UUID.generate(),
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date: attrs[:date] || attrs.date,
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sfi: attrs[:sfi],
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sfi_adjusted: attrs[:sfi_adjusted],
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sunspot_number: attrs[:sunspot_number],
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ap_index: attrs[:ap_index],
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kp_values: attrs[:kp_values],
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inserted_at: now,
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updated_at: now
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}
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end)
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{count, _} =
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Repo.insert_all(SolarIndex, entries,
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on_conflict:
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from(s in SolarIndex,
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update: [
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set: [
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sfi: fragment("EXCLUDED.sfi"),
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sfi_adjusted: fragment("EXCLUDED.sfi_adjusted"),
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sunspot_number: fragment("EXCLUDED.sunspot_number"),
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ap_index: fragment("EXCLUDED.ap_index"),
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kp_values: fragment("EXCLUDED.kp_values"),
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updated_at: fragment("EXCLUDED.updated_at")
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]
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],
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where:
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s.sfi != fragment("EXCLUDED.sfi") or
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s.ap_index != fragment("EXCLUDED.ap_index")
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),
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conflict_target: [:date]
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)
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acc + count
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end)
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end
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def get_solar_index(date) do
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Repo.get_by(SolarIndex, date: date)
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end
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def existing_solar_dates do
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SolarIndex
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|> select([s], s.date)
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|> Repo.all()
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|> MapSet.new()
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end
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def sync_stations! do
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asos =
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for s <-
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~w(AK AL AR AZ CA CO CT DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NH NJ NM NV NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY),
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do: "#{s}_ASOS"
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for network <- asos ++ ["RAOB"] do
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type = if String.contains?(network, "ASOS"), do: "asos", else: "sounding"
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case IemClient.fetch_network(network) do
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{:ok, stations} ->
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for s <- stations do
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%Station{}
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|> Station.changeset(Map.put(s, :station_type, type))
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|> Repo.insert(on_conflict: :nothing, conflict_target: [:station_code, :station_type])
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end
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Logger.info("Synced #{length(stations)} stations from #{network}")
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{:error, e} ->
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Logger.warning("Failed to sync #{network}: #{inspect(e)}")
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end
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Process.sleep(200)
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end
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count = Repo.aggregate(Station, :count)
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Logger.info("Weather stations sync complete: #{count} total")
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:ok
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end
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def nearby_stations(lat, lon, station_type, radius_km) do
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dlat = radius_km / @km_per_deg_lat
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dlon = radius_km / (@km_per_deg_lat * :math.cos(lat * :math.pi() / 180))
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Station
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|> where([s], s.station_type == ^station_type)
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|> where(
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[s],
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s.lat >= ^(lat - dlat) and s.lat <= ^(lat + dlat) and
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s.lon >= ^(lon - dlon) and s.lon <= ^(lon + dlon)
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)
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|> Repo.all()
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end
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def sounding_times_around(dt) do
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date = DateTime.to_date(dt)
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times =
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if dt.hour < 12 do
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[
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DateTime.new!(Date.add(date, -1), ~T[12:00:00], "Etc/UTC"),
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DateTime.new!(date, ~T[00:00:00], "Etc/UTC")
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]
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else
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[
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DateTime.new!(date, ~T[00:00:00], "Etc/UTC"),
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DateTime.new!(date, ~T[12:00:00], "Etc/UTC")
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]
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end
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Enum.uniq(times)
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end
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def weather_for_contact(contact_params, opts \\ []) do
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lat = contact_params[:lat] || contact_params.lat
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lon = contact_params[:lon] || contact_params.lon
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timestamp = contact_params[:timestamp] || contact_params.timestamp
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radius_km = Keyword.get(opts, :radius_km, 150)
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time_window_hours = Keyword.get(opts, :time_window_hours, 6)
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# Bounding box in degrees
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dlat = radius_km / @km_per_deg_lat
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dlon = radius_km / (@km_per_deg_lat * :math.cos(lat * :math.pi() / 180))
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time_start = DateTime.add(timestamp, -time_window_hours * 3600, :second)
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time_end = DateTime.add(timestamp, time_window_hours * 3600, :second)
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station_ids =
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Station
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|> where(
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[s],
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s.lat >= ^(lat - dlat) and s.lat <= ^(lat + dlat) and
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s.lon >= ^(lon - dlon) and s.lon <= ^(lon + dlon)
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)
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|> select([s], s.id)
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surface_observations =
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SurfaceObservation
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|> where([o], o.station_id in subquery(station_ids))
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|> where([o], o.observed_at >= ^time_start and o.observed_at <= ^time_end)
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|> preload(:station)
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|> Repo.all()
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soundings =
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Sounding
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|> where([s], s.station_id in subquery(station_ids))
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|> where([s], s.observed_at >= ^time_start and s.observed_at <= ^time_end)
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|> preload(:station)
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|> Repo.all()
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%{surface_observations: surface_observations, soundings: soundings}
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end
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def latest_grid_valid_time do
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Repo.one(
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from(h in HrrrProfile,
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where: h.is_grid_point == true,
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select: max(h.valid_time)
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)
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)
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end
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def latest_weather_grid(bounds) do
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case latest_grid_valid_time() do
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nil ->
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[]
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latest_vt ->
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from(h in HrrrProfile,
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where:
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h.valid_time == ^latest_vt and
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h.is_grid_point == true and
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h.lat >= ^bounds["south"] and h.lat <= ^bounds["north"] and
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h.lon >= ^bounds["west"] and h.lon <= ^bounds["east"],
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select: %{
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lat: h.lat,
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lon: h.lon,
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valid_time: h.valid_time,
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temperature: h.surface_temp_c,
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dewpoint_depression: fragment("? - ?", h.surface_temp_c, h.surface_dewpoint_c),
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bl_height: h.hpbl_m,
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pwat: h.pwat_mm,
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refractivity_gradient: h.min_refractivity_gradient,
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ducting: h.ducting_detected,
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surface_pressure_mb: h.surface_pressure_mb,
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surface_temp_c: h.surface_temp_c,
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surface_dewpoint_c: h.surface_dewpoint_c,
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surface_refractivity: h.surface_refractivity,
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profile: h.profile,
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duct_characteristics: h.duct_characteristics
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}
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)
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|> Repo.all()
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|> Enum.map(&derive_and_clean/1)
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end
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end
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def weather_point_detail(lat, lon, valid_time) do
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step = 0.125
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snapped_lat = Float.round(Float.round(lat / step) * step, 3)
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snapped_lon = Float.round(Float.round(lon / step) * step, 3)
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from(h in HrrrProfile,
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where: h.lat == ^snapped_lat and h.lon == ^snapped_lon and h.valid_time == ^valid_time,
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select: %{
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lat: h.lat,
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lon: h.lon,
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valid_time: h.valid_time,
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temperature: h.surface_temp_c,
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dewpoint_depression: fragment("? - ?", h.surface_temp_c, h.surface_dewpoint_c),
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bl_height: h.hpbl_m,
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pwat: h.pwat_mm,
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refractivity_gradient: h.min_refractivity_gradient,
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ducting: h.ducting_detected,
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surface_pressure_mb: h.surface_pressure_mb,
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surface_temp_c: h.surface_temp_c,
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surface_dewpoint_c: h.surface_dewpoint_c,
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surface_refractivity: h.surface_refractivity,
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profile: h.profile,
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duct_characteristics: h.duct_characteristics
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}
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)
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|> Repo.one()
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|> then(fn
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nil -> nil
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row -> derive_and_clean(row)
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end)
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end
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defp derive_and_clean(row) do
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derived = WeatherLayers.derive(row)
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row
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|> Map.merge(derived)
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|> Map.drop([:profile, :duct_characteristics, :surface_temp_c, :surface_dewpoint_c])
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end
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def upsert_hrrr_profile(attrs) do
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%HrrrProfile{}
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|> HrrrProfile.changeset(attrs)
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|> Repo.insert(
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on_conflict: :nothing,
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conflict_target: [:lat, :lon, :valid_time]
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)
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end
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def upsert_hrrr_profiles_batch(profiles, _opts \\ []) do
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now = DateTime.truncate(DateTime.utc_now(), :second)
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profiles
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|> Enum.chunk_every(500)
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|> Enum.reduce({0, nil}, fn chunk, {total_count, _} ->
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entries =
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Enum.map(chunk, fn attrs ->
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is_gp =
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rem(round(attrs.lat * 1000), 125) == 0 and
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rem(round(attrs.lon * 1000), 125) == 0
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Map.merge(attrs, %{
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id: Ecto.UUID.generate(),
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is_grid_point: is_gp,
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inserted_at: now,
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updated_at: now
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})
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end)
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{count, rows} =
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Repo.insert_all(HrrrProfile, entries,
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on_conflict: :nothing,
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conflict_target: [:lat, :lon, :valid_time]
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)
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{total_count + count, rows}
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end)
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end
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def has_hrrr_profile?(lat, lon, valid_time) do
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dlat = 0.07
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dlon = 0.07
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HrrrProfile
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|> where(
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[h],
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h.lat >= ^(lat - dlat) and h.lat <= ^(lat + dlat) and
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h.lon >= ^(lon - dlon) and h.lon <= ^(lon + dlon) and
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h.valid_time == ^valid_time
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)
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|> Repo.exists?()
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end
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def hrrr_for_contact(%{pos1: nil}), do: nil
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def hrrr_for_contact(contact) do
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lat = contact.pos1["lat"]
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lon = contact.pos1["lon"] || contact.pos1["lng"]
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if lat && lon do
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find_nearest_hrrr(lat, lon, contact.qso_timestamp)
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end
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end
|
|
|
|
def find_nearest_hrrr(lat, lon, timestamp) do
|
|
dlat = 0.07
|
|
dlon = 0.07
|
|
time_start = DateTime.add(timestamp, -3600, :second)
|
|
time_end = DateTime.add(timestamp, 3600, :second)
|
|
|
|
HrrrProfile
|
|
|> where(
|
|
[h],
|
|
h.lat >= ^(lat - dlat) and h.lat <= ^(lat + dlat) and
|
|
h.lon >= ^(lon - dlon) and h.lon <= ^(lon + dlon) and
|
|
h.valid_time >= ^time_start and h.valid_time <= ^time_end
|
|
)
|
|
|> order_by([h],
|
|
asc:
|
|
fragment(
|
|
"ABS(? - ?) + ABS(? - ?) + ABS(EXTRACT(EPOCH FROM ? - ?))",
|
|
h.lat,
|
|
^lat,
|
|
h.lon,
|
|
^lon,
|
|
h.valid_time,
|
|
^timestamp
|
|
)
|
|
)
|
|
|> limit(1)
|
|
|> Repo.one()
|
|
end
|
|
|
|
def hrrr_profiles_for_path(%{pos1: nil}), do: []
|
|
|
|
def hrrr_profiles_for_path(contact) do
|
|
contact
|
|
|> Microwaveprop.Radio.contact_path_points()
|
|
|> Enum.map(fn {lat, lon} -> find_nearest_hrrr(lat, lon, contact.qso_timestamp) end)
|
|
|> Enum.reject(&is_nil/1)
|
|
end
|
|
|
|
@doc """
|
|
Find the best available atmospheric profile for a contact.
|
|
Tries HRRR first (3 km, hourly), falls back to ERA5 (0.25°, hourly).
|
|
Returns the profile struct or nil.
|
|
"""
|
|
def best_profile_for_contact(contact) do
|
|
hrrr_for_contact(contact) || era5_for_contact(contact)
|
|
end
|
|
|
|
@doc "Find all atmospheric profiles along a contact's path, from any source."
|
|
def profiles_along_path(contact) do
|
|
hrrr_path = hrrr_profiles_for_path(contact)
|
|
|
|
if hrrr_path == [] do
|
|
era5_profiles_for_path(contact)
|
|
else
|
|
hrrr_path
|
|
end
|
|
end
|
|
|
|
def era5_for_contact(%{pos1: nil}), do: nil
|
|
|
|
def era5_for_contact(contact) do
|
|
lat = contact.pos1["lat"]
|
|
lon = contact.pos1["lon"] || contact.pos1["lng"]
|
|
|
|
if lat && lon do
|
|
find_nearest_era5(lat, lon, contact.qso_timestamp)
|
|
end
|
|
end
|
|
|
|
def era5_profiles_for_path(%{pos1: nil}), do: []
|
|
|
|
def era5_profiles_for_path(contact) do
|
|
contact
|
|
|> Microwaveprop.Radio.contact_path_points()
|
|
|> Enum.map(fn {lat, lon} -> find_nearest_era5(lat, lon, contact.qso_timestamp) end)
|
|
|> Enum.reject(&is_nil/1)
|
|
end
|
|
|
|
def find_nearest_era5(lat, lon, timestamp) do
|
|
dlat = 0.15
|
|
dlon = 0.15
|
|
time_start = DateTime.add(timestamp, -1800, :second)
|
|
time_end = DateTime.add(timestamp, 1800, :second)
|
|
|
|
Era5Profile
|
|
|> where(
|
|
[p],
|
|
p.lat >= ^(lat - dlat) and p.lat <= ^(lat + dlat) and
|
|
p.lon >= ^(lon - dlon) and p.lon <= ^(lon + dlon) and
|
|
p.valid_time >= ^time_start and p.valid_time <= ^time_end
|
|
)
|
|
|> order_by([p],
|
|
asc:
|
|
fragment(
|
|
"ABS(? - ?) + ABS(? - ?)",
|
|
p.lat,
|
|
^lat,
|
|
p.lon,
|
|
^lon
|
|
)
|
|
)
|
|
|> limit(1)
|
|
|> Repo.one()
|
|
end
|
|
|
|
def find_nearest_rtma(lat, lon, timestamp) do
|
|
dlat = 0.05
|
|
dlon = 0.05
|
|
time_start = DateTime.add(timestamp, -900, :second)
|
|
time_end = DateTime.add(timestamp, 900, :second)
|
|
|
|
RtmaObservation
|
|
|> where(
|
|
[o],
|
|
o.lat >= ^(lat - dlat) and o.lat <= ^(lat + dlat) and
|
|
o.lon >= ^(lon - dlon) and o.lon <= ^(lon + dlon) and
|
|
o.valid_time >= ^time_start and o.valid_time <= ^time_end
|
|
)
|
|
|> order_by([o],
|
|
asc:
|
|
fragment(
|
|
"ABS(? - ?) + ABS(? - ?) + ABS(EXTRACT(EPOCH FROM ? - ?))",
|
|
o.lat,
|
|
^lat,
|
|
o.lon,
|
|
^lon,
|
|
o.valid_time,
|
|
^timestamp
|
|
)
|
|
)
|
|
|> limit(1)
|
|
|> Repo.one()
|
|
end
|
|
|
|
def round_to_hrrr_grid(lat, lon) do
|
|
{Float.round(lat / 1.0, 2), Float.round(lon / 1.0, 2)}
|
|
end
|
|
|
|
@doc """
|
|
Delete HRRR grid profiles older than 24 hours that sit on the 0.125° grid.
|
|
Preserves QSO-linked profiles which are at arbitrary lat/lon positions.
|
|
With 19 forecast hours per run, this keeps ~2 runs worth of grid profiles.
|
|
"""
|
|
def prune_old_grid_profiles do
|
|
cutoff = DateTime.add(DateTime.utc_now(), -24, :hour)
|
|
# Bound the scan to recent partitions only (grid profiles are at most ~48h old).
|
|
# Without a lower bound, Postgres scans every partition back to 2016.
|
|
floor = DateTime.add(DateTime.utc_now(), -72, :hour)
|
|
|
|
# Only delete profiles on the 0.125° propagation grid, preserving QSO-linked
|
|
# profiles which sit at arbitrary lat/lon positions (HRRR's native ~3km grid).
|
|
%{num_rows: deleted} =
|
|
Repo.query!(
|
|
"""
|
|
DELETE FROM hrrr_profiles
|
|
WHERE valid_time >= $2 AND valid_time < $1
|
|
AND is_grid_point = true
|
|
""",
|
|
[cutoff, floor],
|
|
timeout: 300_000
|
|
)
|
|
|
|
if deleted > 0 do
|
|
require Logger
|
|
|
|
Logger.info("Pruned #{deleted} old HRRR grid profiles (valid_time < #{cutoff})")
|
|
end
|
|
|
|
deleted
|
|
end
|
|
|
|
def round_to_iemre_grid(lat, lon) do
|
|
{Float.round(lat * 8) / 8, Float.round(lon * 8) / 8}
|
|
end
|
|
|
|
def upsert_iemre_observation(attrs) do
|
|
%IemreObservation{}
|
|
|> IemreObservation.changeset(attrs)
|
|
|> Repo.insert(
|
|
on_conflict: :nothing,
|
|
conflict_target: [:lat, :lon, :date]
|
|
)
|
|
end
|
|
|
|
def has_iemre_observation?(lat, lon, date) do
|
|
IemreObservation
|
|
|> where([i], i.lat == ^lat and i.lon == ^lon and i.date == ^date)
|
|
|> Repo.exists?()
|
|
end
|
|
|
|
def iemre_for_contact(%{pos1: nil}), do: nil
|
|
|
|
def iemre_for_contact(contact) do
|
|
lat = contact.pos1["lat"]
|
|
lon = contact.pos1["lon"] || contact.pos1["lng"]
|
|
|
|
if lat && lon do
|
|
find_nearest_iemre(lat, lon, contact.qso_timestamp)
|
|
end
|
|
end
|
|
|
|
def find_nearest_iemre(lat, lon, timestamp) do
|
|
{rlat, rlon} = round_to_iemre_grid(lat, lon)
|
|
date = DateTime.to_date(timestamp)
|
|
|
|
IemreObservation
|
|
|> where([i], i.lat == ^rlat and i.lon == ^rlon and i.date == ^date)
|
|
|> Repo.one()
|
|
end
|
|
|
|
def iemre_for_path(%{pos1: nil}), do: []
|
|
|
|
def iemre_for_path(contact) do
|
|
contact
|
|
|> Microwaveprop.Radio.contact_path_points()
|
|
|> Enum.map(fn {lat, lon} -> find_nearest_iemre(lat, lon, contact.qso_timestamp) end)
|
|
|> Enum.reject(&is_nil/1)
|
|
end
|
|
end
|