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Django

Django mixin for reusable absolute url method

Django mixin for reusable absolute url method

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from django.urls import reverse

class AbsoluteUrlMixin:
    '''
    Example:
        class Category(AbsoluteUrlMixin, models.Model):
            name = models.CharField(max_length=100)

            url_name = 'update'

        I use the convention as pattern:

            app_name.model_name.detail

    '''
    def get_absolute_url(self):
        kwargs = {}
        slug = hasattr(self, 'slug')
        url_name = hasattr(self, 'url_name')
        kwargs['pk'] = self.pk
        if not url_name:
            url_name = 'detail'
        if slug:
            kwargs['slug'] = self.slug
        return reverse('{}.{}.{}'.format(self._meta.app_label,
            self.__class__.__name__.lower(), url_name), kwargs=kwargs)
Oct 10, 2017 python
Django

Convert linestring string into linestring object

Convert linestring string into linestring object

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from django.contrib.gis.geos import GEOSGeometry, GEOSException

def convert_linestring(data):
    '''
     Get the route from the  array
     Convert the route in LineString object
    '''

    linestring_raw = ''
    k = 0
    for i in data:
        k += 1
        if i in linestring_raw:
            pass
        else:
            linestring_raw += i
            linestring_raw += ','
    wkt = "LineString({})".format(linestring_raw).replace(',)', ')')
    try:
        linestring = GEOSGeometry(wkt)
        linestring.srid = 4326
    except GEOSException:
        linestring = None
    return linestring
Oct 08, 2017 python
Django

Convert polygon string into polygon object

Convert polygon string into polygon object

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from django.contrib.gis.geos import GEOSGeometry, GEOSException


def convert_polygon(data):
    '''
     Get the polygon from the  array
     Convert the polygon in Polygon object
    '''

    polygon_raw_string = ''
    for i in data:
        if i in polygon_raw_string:
            pass
        else:
            polygon_raw_string += i
            polygon_raw_string += ' , '

    polygon_raw_string += data[0]
    wkt = "POLYGON(("+polygon_raw_string+"))"
    try:
        polygon = GEOSGeometry(wkt)
        polygon.srid = 4326
    except GEOSException:
        polygon = None
    return polygon
Oct 08, 2017 python