from django.contrib.gis.db import models from django.utils.encoding import python_2_unicode_compatible @python_2_unicode_compatible class NamedModel(models.Model): name = models.CharField(max_length=25) objects = models.GeoManager() class Meta: abstract = True def __str__(self): return self.name class State(NamedModel): pass class County(NamedModel): state = models.ForeignKey(State) mpoly = models.MultiPolygonField(srid=4269) # 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() # 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', }