Viewing github.com/django/django-stable-4.1.x/tests/gis_tests/layermap/models.py

from django.contrib.gis.db import models

```
class NamedModel(models.Model):
```

    name = models.CharField(max_length=25)

```
    class Meta:
```
```
        abstract = True
```
```
    def __str__(self):
```
```
        return self.name
```
```
class State(NamedModel):
```
```
    pass
```
```
class County(NamedModel):
```

    state = models.ForeignKey(State, models.CASCADE)

    mpoly = models.MultiPolygonField(srid=4269, null=True)  # Multipolygon in NAD83

```
class CountyFeat(NamedModel):
```

    poly = models.PolygonField(srid=4269)

```
class City(NamedModel):
```

    name_txt = models.TextField(default="")

    name_short = models.CharField(max_length=5)

```
    population = models.IntegerField()
```

    density = models.DecimalField(max_digits=7, decimal_places=1)

```
    dt = models.DateField()
```
```
    point = models.PointField()
```
```
    class Meta:
```
```
        app_label = "layermap"
```
```
class Interstate(NamedModel):
```

    length = models.DecimalField(max_digits=6, decimal_places=2)

```
    path = models.LineStringField()
```
```
    class Meta:
```
```
        app_label = "layermap"
```

# Same as `City` above, but for testing model inheritance.

```
class CityBase(NamedModel):
```
```
    population = models.IntegerField()
```

    density = models.DecimalField(max_digits=7, decimal_places=1)

```
    point = models.PointField()
```
```
class ICity1(CityBase):
```
```
    dt = models.DateField()
```
```
    class Meta(CityBase.Meta):
```
```
        pass
```
```
class ICity2(ICity1):
```

    dt_time = models.DateTimeField(auto_now=True)

```
    class Meta(ICity1.Meta):
```
```
        pass
```
```
class Invalid(models.Model):
```
```
    point = models.PointField()
```
```
class HasNulls(models.Model):
```

    uuid = models.UUIDField(primary_key=True, editable=False)

    geom = models.PolygonField(srid=4326, blank=True, null=True)

    datetime = models.DateTimeField(blank=True, null=True)

    integer = models.IntegerField(blank=True, null=True)

    num = models.FloatField(blank=True, null=True)

    boolean = models.BooleanField(blank=True, null=True)

    name = models.CharField(blank=True, null=True, max_length=20)

```
class DoesNotAllowNulls(models.Model):
```

    uuid = models.UUIDField(primary_key=True, editable=False)

    geom = models.PolygonField(srid=4326)

```
    datetime = models.DateTimeField()
```
```
    integer = models.IntegerField()
```
```
    num = models.FloatField()
```
```
    boolean = models.BooleanField()
```

    name = models.CharField(max_length=20)

# Mapping dictionaries for the models above.

```
co_mapping = {
```
```
    "name": "Name",
```

    # ForeignKey's use another mapping dictionary for the _related_ Model

```
    # (State in this case).
```
```
    "state": {"name": "State"},
```

    "mpoly": "MULTIPOLYGON",  # Will convert POLYGON features into MULTIPOLYGONS.

```
}
```
```
cofeat_mapping = {
```
```
    "name": "Name",
```
```
    "poly": "POLYGON",
```
```
}
```
```
city_mapping = {
```
```
    "name": "Name",
```
```
    "population": "Population",
```
```
    "density": "Density",
```
```
    "dt": "Created",
```
```
    "point": "POINT",
```
```
}
```
```
inter_mapping = {
```
```
    "name": "Name",
```
```
    "length": "Length",
```
```
    "path": "LINESTRING",
```
```
}
```
```
has_nulls_mapping = {
```
```
    "geom": "POLYGON",
```
```
    "uuid": "uuid",
```
```
    "datetime": "datetime",
```
```
    "name": "name",
```
```
    "integer": "integer",
```
```
    "num": "num",
```
```
    "boolean": "boolean",
```
```
}
```

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