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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