See:
https://stackoverflow.com/questions/54412377/adding-values-to-django-queryset
VIEW
def position_view(request):
packet_data = TncData.objects.exclude(lat=0).order_by('-dt_heard')[:100]
for packet in packet_data:
*# my complex math calculation*
* packet.distance = "# complex math formula using packet.lat and
packet.lon"*
return render(
request,
'main/position.html',
{'packet_data': packet_data, 'distance': distance})
TEMPLATE
*# suggest you use a better term than "field" => maybe "record"?*
{% for field in packet_data %}
<tr class='atable'>
<td class='atable'>{{field.callsign}}</td>
<td class='atable'>{{field.lat|floatformat:2}} N
{{field.lon|floatformat:2}} W </td>
<td class='atable'></td>
*<td class='atable'>{{field.distance}}</td>*
HTH!
On Tuesday, 20 July 2021 at 22:25:04 UTC+2 mab.mo...@gmail.com wrote:
> Hello,
>
> I am trying to perform a complex math calculation from a django query set.
> How can I pass the results to the template for display? Annotations won't
> work since the math is not a simple sum, diff or average.
>
> MODEL
>
> class TncData(models.Model):
> callsign = models.TextField(max_length=20)
> lat = models.FloatField(null=True, blank=True, default=None)
> lon = models.FloatField(null=True, blank=True, default=None)
> path = models.TextField(max_length=250)
> message = models.TextField(max_length=250)
> dt_heard = models.DateTimeField(auto_now_add=False)
>
> def __str__(self):
> return str(self.callsign)
>
> VIEW
>
> def position_view(request):
>
> packet_data =
> TncData.objects.exclude(lat=0).order_by('-dt_heard')[:100]
>
> *# my complex math calculation*
> * # need to do something like append distance to packet_data like
> packet_data.distance*
>
> * distance = "# complex math formula using packet_data.lat and
> packet_data.lon"*
>
> return render(request, 'main/position.html',
> {'packet_data':packet_data,})
>
> TEMPLATE
>
> {% for field in packet_data %}
>
> <tr class='atable'>
> <td class='atable'>{{field.callsign}}</td>
> <td class='atable'>{{field.lat|floatformat:2}} N
> {{field.lon|floatformat:2}} W </td>
> <td class='atable'></td>
> *<td class='atable'>{{packet_data.distance}}</td>*
> <td class='atable'>{{field.dt_heard|date:"D m/d H:i"}}</td>
> </tr>
>
> {% endfor %}
>
>
>
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