skhohlov

I'm working on simple GTS system  and one of the task is calculate distance.  Usually  GPS tracker sends coordinates as Lon , Lat.  It is easy to understands by navigator,  but not a citizen. Brute force conversation requires knowledge of geography, mathematic etc.  Django   and PostGIS have simple and elegant solution:  example model: from django.contrib.gis.db import models as gismodels class Points(models.Model):     """ Simple class with one Point only """     Point    = gismodels.PointField() view.py pointlist is array of the points containing geo data:  for point in pointlist:             plist.append(point.Point)         try:             linestring = LineString(plist)             linestring.srid=4326             linestring.transform(22186)   ...

Passing values from the view to the form it is really popular. Ex: form should be different for different kind of the user. Unfortunately I have not seen a documentation how to do this with class based view. This task is separated in the two parts: 1) Prepare values in the view class Myview(): """ This is only example view """ # set form form_class = myformwithadditionallogic # our function which pass some values to the form def get_initial(self): """ Passing initial values to the form""" # default initial should be saved super(Myview, self).get_initial() self.initial = {"ourvalue":1} return self.initial That all for view. Second part is retreive this data in the form: class myformwithadditionallogic(): """ the example form . has no field only constructor """ def __init__(self, *args, **kwargs): """ Constructor """ myvalues = kwargs.pop( ...