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101 lines
2.4 KiB
Python
101 lines
2.4 KiB
Python
from django.contrib.gis.db import models
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class NamedModel(models.Model):
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name = models.CharField(max_length=25)
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class Meta:
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abstract = True
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required_db_features = ['gis_enabled']
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def __str__(self):
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return self.name
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class State(NamedModel):
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pass
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class County(NamedModel):
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state = models.ForeignKey(State, models.CASCADE)
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mpoly = models.MultiPolygonField(srid=4269) # Multipolygon in NAD83
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class CountyFeat(NamedModel):
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poly = models.PolygonField(srid=4269)
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class City(NamedModel):
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name_txt = models.TextField(default='')
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name_short = models.CharField(max_length=5)
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population = models.IntegerField()
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density = models.DecimalField(max_digits=7, decimal_places=1)
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dt = models.DateField()
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point = models.PointField()
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class Meta:
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app_label = 'layermap'
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required_db_features = ['gis_enabled']
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class Interstate(NamedModel):
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length = models.DecimalField(max_digits=6, decimal_places=2)
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path = models.LineStringField()
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class Meta:
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app_label = 'layermap'
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required_db_features = ['gis_enabled']
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# Same as `City` above, but for testing model inheritance.
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class CityBase(NamedModel):
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population = models.IntegerField()
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density = models.DecimalField(max_digits=7, decimal_places=1)
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point = models.PointField()
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class ICity1(CityBase):
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dt = models.DateField()
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class Meta(CityBase.Meta):
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pass
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class ICity2(ICity1):
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dt_time = models.DateTimeField(auto_now=True)
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class Meta(ICity1.Meta):
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pass
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class Invalid(models.Model):
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point = models.PointField()
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class Meta:
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required_db_features = ['gis_enabled']
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# Mapping dictionaries for the models above.
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co_mapping = {
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'name': 'Name',
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# ForeignKey's use another mapping dictionary for the _related_ Model (State in this case).
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'state': {'name': 'State'},
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'mpoly': 'MULTIPOLYGON', # Will convert POLYGON features into MULTIPOLYGONS.
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}
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cofeat_mapping = {'name': 'Name',
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'poly': 'POLYGON',
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}
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city_mapping = {'name': 'Name',
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'population': 'Population',
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'density': 'Density',
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'dt': 'Created',
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'point': 'POINT',
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}
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inter_mapping = {'name': 'Name',
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'length': 'Length',
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'path': 'LINESTRING',
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}
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