Adjusted model definition in GeoDjango tutorial.
The example uses the world border data set, where one of the entries has a null field value.
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@ -203,7 +203,7 @@ model to represent this data::
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name = models.CharField(max_length=50)
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area = models.IntegerField()
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pop2005 = models.IntegerField('Population 2005')
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fips = models.CharField('FIPS Code', max_length=2)
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fips = models.CharField('FIPS Code', max_length=2, null=True)
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iso2 = models.CharField('2 Digit ISO', max_length=2)
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iso3 = models.CharField('3 Digit ISO', max_length=3)
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un = models.IntegerField('United Nations Code')
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