models.py

from django.contrib.gis.db import models
from django.utils.text import slugify

__all__ = [
    'Location',
    'LocatedFile',
    'BoxedLocation',
    'GeometryModel',
    'Nullable',
    'PointModel',
    'LineStringModel',
    'PolygonModel',
    'MultiPolygonModel',
    'MultiLineStringModel',
    'MultiPointModel',
]


class BaseModel(models.Model):
    name = models.CharField(max_length=32)
    slug = models.SlugField(max_length=128, unique=True, blank=True)
    timestamp = models.DateTimeField(null=True, blank=True)

    class Meta:
        abstract = True

    def __str__(self):
        return self.name

    def _generate_slug(self):
        if self.slug == '' or self.slug is None:
            try:
                name = str(self.name)
            except NameError:
                name = self.name
            self.slug = slugify(name)

    def clean(self):
        self._generate_slug()

    def save(self, *args, **kwargs):
        self._generate_slug()
        super().save(*args, **kwargs)


class BaseModelGeometry(BaseModel):
    class Meta:
        abstract = True

    geometry = models.GeometryField()


class Location(BaseModelGeometry):
    pass


class OtherSridLocation(BaseModelGeometry):
    geometry = models.GeometryField(srid=31287)


class LocatedFile(BaseModelGeometry):
    file = models.FileField(upload_to='located_files', blank=True, null=True)


class BoxedLocation(BaseModelGeometry):
    bbox_geometry = models.PolygonField()


class Nullable(BaseModel):
    geometry = models.GeometryField(blank=True, null=True)


class SchemaBaseModel(models.Model):
    random_field1 = models.CharField(max_length=32)
    random_field2 = models.IntegerField()

    class Meta:
        abstract = True


class PointModel(SchemaBaseModel):
    location = models.PointField()


class LineStringModel(SchemaBaseModel):
    points = models.LineStringField()


class PolygonModel(SchemaBaseModel):
    polygon = models.PolygonField()


class GeometryModel(SchemaBaseModel):
    points = models.GeometryField()


class MultiPointModel(SchemaBaseModel):
    points = models.MultiPointField()


class MultiLineStringModel(SchemaBaseModel):
    points = models.MultiLineStringField()


class MultiPolygonModel(SchemaBaseModel):
    polygon = models.MultiPolygonField()