Databases
StackOverflow2013
Postsdbo
POGeoDjango: Sort by country of the geolocation
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POGeoDjango: Sort by country of the geolocation
    primarykey
    data
    text
    <p>Hi Stackoverflow people, </p> <p>I have a model which contains projects with the corresponding geolocation:</p> <pre><code>class Project(models.Model): name = models.CharField(_('Project Name'), max_length=100, null=True, blank=True) geolocation = models.PointField(_('Project Location')) ... </code></pre> <p>In addition, another model is representing a shapefile with the country borders:</p> <pre><code>class WorldBorder(models.Model): name = models.CharField(max_length=50) mpoly = models.MultiPolygonField() objects = models.GeoManager() class Meta: ordering = ('name',) def __unicode__(self): return self.name </code></pre> <p><strong>How can I do a query on Project and order the results by the country name of the geolocation?</strong> A query like </p> <blockquote> <p>d = Project.objects.all().order_by(geolocation__name)</p> </blockquote> <p>does not work since geolocation is not a Foreignkey. <strong>Do I really have loop through all projects and determine the country manually like in my example below?</strong></p> <pre><code>projects = Project.objects.all() result = [] for project in projects country = WorldBorder.objects.filter(mpoly__contains = project.geolocation) foo = [project.name, country] result.append(foo) # now sort the list according to the country result = sorted(result, key=itemgetter(1)) </code></pre> <p><strong>There should be a more professional and elegant solution? Any suggestions from the experienced Python people?</strong> Can I use joins for that purpose?</p> <p>Thank you for your suggestions!</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USneurix
    1. USneurix
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. POGeoDjango: Sort by country of the geolocation
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POGeoDjango: Sort by country of the geolocation
      1. USMohammad Tayseer
      1. VTFavorite
    1. COI think it might be better to add a country (ISO code) field to your Project model and update this accordingly when the PointField changes, I doubt projects would change location often, so this would save a lot of needless queries?
      singulars
      1. POGeoDjango: Sort by country of the geolocation
      1. USHedde van der Heide
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload