from django.contrib.gis.db import models

class State(models.Model):

    name = models.CharField(max_length=20)

    objects = models.GeoManager()

class County(models.Model):

    name = models.CharField(max_length=25)

    state = models.ForeignKey(State)

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

    objects = models.GeoManager()

class CountyFeat(models.Model):

    name = models.CharField(max_length=25)

    poly = models.PolygonField(srid=4269)

    objects = models.GeoManager()

class City(models.Model):

    name = models.CharField(max_length=25)

    population = models.IntegerField()

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

    dt = models.DateField()

    point = models.PointField()

    objects = models.GeoManager()

class Interstate(models.Model):

    name = models.CharField(max_length=20)

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

    path = models.LineStringField()

    objects = models.GeoManager()

# Mapping dictionaries for the models above.

co_mapping = {'name' : 'Name',

              'state' : {'name' : 'State'}, # ForeignKey's use another mapping dictionary for the _related_ Model (State in this case).

              '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',

                 }