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#1 Jan. 5, 2011 05:42:31

Robinson B.
Registered: 2009-11-02
Reputation: +  0  -
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PostGISAdapter error


I am getting the following error when the queryset tries to generate the SQL:
"'str' object has no attribute 'ewkb'"

Here is what I am doing that causes the problem:
shapes = Shape.objects.filter(geom__bboverlaps=bbx)
shape_info = shape_info.filter(shape__in=shapes)

Models are:
class Shape(models.Model):

geom = models.PolygonField()
color = models.IntegerField()

class ShapeInfo(models.Model):

name = models.CharField(max_length=25)
shape = models.ForeignKey(Shape)

The code causing the problem seems to be:

if (len(params) == 1 and params == '' and lookup_type == 'exact'
and connection.features.interprets_empty_strings_as_nulls):
lookup_type = 'isnull'
value_annot = True

Is this not an appropriate way to use this?

Here is the stacktrace:
/Library/Python/2.6/site-packages/django/db/models/query.py in _result_iter
self._fill_cache() ...
▶ Local vars
/Library/Python/2.6/site-packages/django/db/models/query.py in _fill_cache
self._result_cache.append(self._iter.next()) ...
▶ Local vars
/Library/Python/2.6/site-packages/django/db/models/query.py in iterator
for row in compiler.results_iter(): ...
▶ Local vars
/Library/Python/2.6/site-packages/django/db/models/sql/compiler.py in
results_iter
for rows in self.execute_sql(MULTI): ...
▶ Local vars
/Library/Python/2.6/site-packages/django/db/models/sql/compiler.py in
execute_sql
sql, params = self.as_sql() ...
▶ Local vars
/Library/Python/2.6/site-packages/django/db/models/sql/compiler.py in as_sql
where, w_params = self.query.where.as_sql(qn=qn,
connection=self.connection) ...
▶ Local vars
/Library/Python/2.6/site-packages/django/db/models/sql/where.py in as_sql
sql, params = child.as_sql(qn=qn, connection=connection) ...
▶ Local vars
/Library/Python/2.6/site-packages/django/db/models/sql/where.py in as_sql
sql, params = self.make_atom(child, qn, connection) ...
▶ Local vars
/Library/Python/2.6/site-packages/django/db/models/sql/where.py in make_atom
if (len(params) == 1 and params == '' and lookup_type == 'exact' ...
▶ Local vars
/Library/Python/2.6/site-packages/django/contrib/gis/db/backends/postgis/adapter.py
in __eq__
return (self.ewkb == other.ewkb) and (self.srid == other.srid) ...
▼ Local vars
Variable Value
other
''
self
<django.contrib.gis.db.backends.postgis.adapter.PostGISAdapter object at
0x10663bf90>

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