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django/contrib/gis/db/models/aggregates.py

 

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from django.db.models import Aggregate

 

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from django.contrib.gis.db.backend import SpatialBackend

 

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from django.contrib.gis.db.models.sql import GeomField

 

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class GeoAggregate(Aggregate):

 

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    def add_to_query(self, query, alias, col, source, is_summary):

 

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        if hasattr(source, 'geom_type'):

 

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            # Doing additional setup on the Query object for spatial aggregates.

 

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            aggregate = getattr(query.aggregates_module, self.name)

 

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            # Adding a conversion class instance and any selection wrapping

 

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            # SQL (e.g., needed by Oracle).

 

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            if aggregate.conversion_class is GeomField:

 

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                query.extra_select_fields[alias] = GeomField()

 

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                if SpatialBackend.select:

 

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                    query.custom_select[alias] = SpatialBackend.select

 

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        super(GeoAggregate, self).add_to_query(query, alias, col, source, is_summary)

 

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class Collect(GeoAggregate):

 

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    name = 'Collect'

 

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class Extent(GeoAggregate):

 

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    name = 'Extent'

 

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class MakeLine(GeoAggregate):

 

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    name = 'MakeLine'

 

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class Union(GeoAggregate):

 

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    name = 'Union'

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