#27557: Overzealous GEOSGeometry sub-subclasses casts
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Reporter: Claude Paroz | Owner: nobody
Type: Bug | Status: new
Component: GIS | Version: master
Severity: Normal | Keywords:
Triage Stage: Accepted | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Reported by Pete Flugstad in
https://groups.google.com/forum/#!topic/geodjango/-tao0uPNYY8
When writing a Point, Polygon, etc. subclass, the parent
`GEOSGeometry._post_init` is force casting the instance to one of the
hardcoded GEOSGeometry subclass, which breaks method overriding of the
subclass.
Example:
{{{
from django.contrib.gis.geos import Polygon
class ExtendedPolygon(Polygon):
def __init__(self, point_list, data=0 ):
super(ExtendedPolygon, self).__init__(point_list)
self._data = data
def __str__(self):
return "EXT_POLYGON - data: %d - %s" % (self._data, self.wkt )
}}}
{{{
>>> from extpoly import ExtendedPolygon
>>> points = ((-75.1, 34.3), (-74.9, 34.3), (-74.9, 34.4), (-75.1, 34.4),
(-75.1, 34.3))
>>> ex = ExtendedPolygon( points, altitude=123, speed=456, direction=789 )
>>> print(ex)
POLYGON ((-75.09999999999999 34.3, -74.90000000000001 34.3,
-74.90000000000001 34.4, -75.09999999999999 34.4, -75.09999999999999
34.3))
>>> type(ex)
<class 'django.contrib.gis.geos.polygon.Polygon'>
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/27557>
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