如何将数据从 Django 中上传的 GPX 文件保存到 PostGis 数据库？

Question

我有以下问题：我的目标是制作一个可以在地图上显示的 gps 轨迹存档。 （使用Python、Django、PostgreSQL、PostGIS）我找到了一个教程： https ://web.archive.org/web/20160425053015/http://ipasic.com/article/uploading-parsing-and-saving-gpx-data -postgis-geodjango文件上传工作正常，但我不知道如何将文件中的数据保存到数据库并将它们用作模型。 我的代码：

表单.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']

模型.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()

视图.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')

正如我之前提到的，文件上传有效，不幸的是发生了以下错误： [Errno 2] No such file or directory: '/uploaded_gpx_files/3359239.gpx' 不知道是什么原因导致此错误，因为文件及其目录都存在，我将非常感谢任何建议

Answer 1

尝试像这样打开您的文件字段：

gpx_file = django_model.filefield.open('r')
gpx = gpxpy.parse(gpx_file)

代替

gpx_file = open(django_model.filefield.url, 'r')
gpx = gpxpy.parse(gpx_file)

那对我有用。