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MagicMirror/defaultmodules/weather/forecast.njk
Kristjan ESPERANTO de3f57f8af weather: fix UV index display and add WeatherFlow precipitation (#4108)
While looking at the WeatherFlow provider (to evaluate #4107), I noticed
a few things that weren't quite right.

1. **UV index was broken for most providers in forecast/hourly views.**
The templates read `uv_index`, but only the WeatherAPI provider actually
wrote that key. All other providers (OpenWeatherMap, WeatherFlow,
PirateWeather, etc.) use `uvIndex` - so UV was silently never displayed
for them. This went unnoticed because `showUVIndex` defaults to `false`
and there were no test assertions for it. Standardized everything on
`uvIndex` and added test coverage.

2. **WeatherFlow didn't map precipitation for current weather.** The API
provides `precip_accum_local_day` and `precip_probability`, but they
weren't passed through. While adding them I also noticed the template
used truthiness checks, which hid valid zero values. Fixed both.

3. **`||` vs `??` in WeatherFlow provider.** Several numeric fields used
`|| null`, replacing valid `0` with `null`. Switched to `??` for
correctness.
2026-04-19 12:50:20 +02:00

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{% if forecast %}
{% set numSteps = forecast | calcNumSteps %}
{% set currentStep = 0 %}
<table class="{{ config.tableClass }}">
{% if config.ignoreToday %}
{% set forecast = forecast.splice(1) %}
{% endif %}
{% set forecast = forecast.slice(0, numSteps) %}
{% for f in forecast %}
<tr
{% if config.colored %}class="colored"{% endif %}
{% if config.fade %}style="opacity: {{ currentStep | opacity(numSteps) }};"{% endif %}
>
{% if (currentStep == 0) and config.ignoreToday == false and config.absoluteDates == false %}
<td class="day">{{ "TODAY" | translate }}</td>
{% elif (currentStep == 1) and config.ignoreToday == false and config.absoluteDates == false %}
<td class="day">{{ "TOMORROW" | translate }}</td>
{% else %}
<td class="day">{{ f.date.format(config.forecastDateFormat) }}</td>
{% endif %}
<td class="bright weather-icon">
<span class="wi weathericon wi-{{ f.weatherType }}"></span>
</td>
<td class="align-right bright max-temp">{{ f.maxTemperature | roundValue | unit("temperature") | decimalSymbol }}</td>
<td class="align-right min-temp">{{ f.minTemperature | roundValue | unit("temperature") | decimalSymbol }}</td>
{% if config.showPrecipitationAmount %}
<td class="align-right bright precipitation-amount">{{ f.precipitationAmount | unit("precip", f.precipitationUnits) }}</td>
{% endif %}
{% if config.showPrecipitationProbability %}
<td class="align-right bright precipitation-prob">{{ f.precipitationProbability | unit('precip', '%') }}</td>
{% endif %}
{% if config.showUVIndex %}
<td class="align-right dimmed uv-index">
{{ f.uvIndex }}
<span class="wi dimmed weathericon wi-hot"></span>
</td>
{% endif %}
</tr>
{% set currentStep = currentStep + 1 %}
{% endfor %}
</table>
{% else %}
<div class="dimmed light small">{{ "LOADING" | translate }}</div>
{% endif %}
<!-- Uncomment the line below to see the contents of the `forecast` object. -->
<!-- <div style="word-wrap:break-word" class="xsmall dimmed">{{ forecast | dump }}</div> -->