I have the following problem: my goal is to make an archive of gps tracks that can be displayed on a map. (using Python, Django, PostgreSQL, PostGIS) I found a tutorial: https://web.archive.org/web/20160425053015/http://ipasic.com/article/uploading-parsing-and-saving-gpx-data-postgis-geodjango the file upload works fine, but I can't figure out how to save data from a file to the database and use them as models. My code:
forms.py
from django import forms
from .models import gpxFile
class UploadGpxForm(forms.ModelForm):
title = forms.CharField(max_length=100)
gpx_file = forms.FileField(required='FALSE')
class Meta:
model = gpxFile
fields = ['title', 'gpx_file']
models.py
from django.contrib.gis.db import models
from django.contrib import admin
from django.contrib.gis import admin as geoadmin
from django.db.models.manager import Manager
def GPX_Folder(instance, filename):
return "uploaded_gpx_files/%s" % (filename)
class gpxFile(models.Model):
title = models.CharField("Title", max_length=100)
gpx_file = models.FileField(upload_to=GPX_Folder, blank=True)
def __unicode__(self):
return self.title
class GPXPoint(models.Model):
name = models.CharField("Name", max_length=50, blank=True)
description = models.CharField("Description", max_length=250, blank=True)
gpx_file = models.ForeignKey(gpxFile, on_delete=models.CASCADE)
point = models.PointField()
objects = models.Manager()
def __unicode__(self):
return unicode(self.name)
class GPXTrack(models.Model):
track = models.MultiLineStringField()
gpx_file = models.ForeignKey(gpxFile, on_delete=models.CASCADE)
objects = models.Manager()
views.py
from django.shortcuts import render
from .forms import UploadGpxForm, Up
from .models import GPXPoint, GPXTrack, gpxFile
from django.http import HttpResponseRedirect
from django.contrib.gis.geos import Point, LineString, MultiLineString
from django.conf import settings
import gpxpy
import gpxpy.gpx
def home(request):
#context = {
#'notes': Note.objects.all()
#}
return render(request, 'gpsarchive/home.html')
def SaveGPXtoPostGIS(f, file_instance):
gpx_file = open(settings.MEDIA_ROOT+ '/uploaded_gpx_files'+'/' + f.name)
gpx = gpxpy.parse(gpx_file)
if gpx.waypoints:
for waypoint in gpx.waypoints:
new_waypoint = GPXPoint()
if waypoint.name:
new_waypoint.name = waypoint.name
else:
new_waypoint.name = 'unknown'
new_waypoint.point = Point(waypoint.longitude, waypoint.latitude)
new_waypoint.gpx_file = file_instance
new_waypoint.save()
if gpx.tracks:
for track in gpx.tracks:
print("track name:" +str(track.name))
new_track = GPXTrack()
for segment in track.segments:
track_list_of_points = []
for point in segment.points:
point_in_segment = Point(point.longitude, point.latitude)
track_list_of_points.append(point_in_segment.coords)
new_track_segment = LineString(track_list_of_points)
new_track.track = MultiLineString(new_track_segment)
new_track.gpx_file = file_instance
new_track.save()
def upload_gpx(request):
if request.method == 'POST':
file_instance = gpxFile()
form = UploadGpxForm(request.POST, request.FILES)
if form.is_valid():
form.save()
SaveGPXtoPostGIS(request.FILES['gpx_file'], file_instance)
return HttpResponseRedirect('success/')
else:
form = UploadGpxForm()
return render(request, 'gpsarchive/form.html', {'form':form})
def upload_success(request):
return render(request, 'gpsarchive/success.html')
As I mentioned before, file upload works, unfortunately the following error occurs:
[Errno 2] No such file or directory: '/uploaded_gpx_files/3359239.gpx'
has no idea what could be causing this error because both the file and its directory exist,I will be extremly grateful for any suggestions
