bikemap/tracking/models.py

from django.db import models
# Create your models here.
from django.contrib.auth.models import User


class Track(models.Model):
    user = models.ForeignKey(User, blank=False)
    start = models.DateTimeField()
    name = models.CharField(max_length=1024, blank=False)
    description = models.TextField(blank=True)

    @property
    def finish(self):
        return self.segment_set.order_by("-time")[0].finish

class Segment(models.Model):
    track = models.ForeignKey(Track)
    time = models.DateTimeField()
    number = models.IntegerField(default=1)

    @property
    def finish(self):
        return self.point_set.order_by("-time")[0].time

class Point(models.Model):
    time = models.DateTimeField()
    latitude = models.DecimalField(max_digits=13, decimal_places=10)
    longitude = models.DecimalField(max_digits=12, decimal_places=10)
    elevation = models.DecimalField(max_digits=20, decimal_places=2)
    segment = models.ForeignKey(Segment)