Question

Help!

I have two objects that i have created using different techniques in django;

>>> from django.contrib.contenttypes.models import ContentType
>>> from myproject.models import Building

Method A

>>> content_type = ContentType.objects.get(app_label='myproject', model='Building')

>>> content_class = content_type.model_class()

>>> content_query = content_class.objects.raw("Select * from pms_building where name like '%build%' ")

>>> type(content_query)

<class 'django.db.models.query.RawQuerySet'>
>>> content_query[0]
# error ....
# Attribute: 'str' object has no attribute 'items'

Method B

>>> bld = Building.objects.raw("Select * from pms_building where name like '%build%' ")

>>> type(bld)

<class 'django.db.models.query.RawQuerySet'>

>>>bld[0]
<Building: Building A>

My question is why are the two objects of the same type behaving differently?

Gath

Answer 1

The SQL query is only executed when you call content_query[0], so the query will fail at that point if something is wrong with content_class for example. At least I noticed that you forgot the objects from the first line:

content_type = ContentType.objects.get(app_label='myproject', model='Building')

EDIT: I get the “‘str’ object has no attribute ‘items'” error when %-marks are incorrectly interpreted. This fixed it for me:

s = "%build%"
content_query = content_class.objects.raw("Select * from pms_building where namelike %s", [s])