Opened 16 years ago
Last modified 10 years ago
#8090 closed
Problem in serializing the list returned from objects.values_list() — at Initial Version
| Reported by: | shavin | Owned by: | nobody |
|---|---|---|---|
| Component: | Core (Serialization) | Version: | dev |
| Severity: | Normal | Keywords: | |
| Cc: | Triage Stage: | Unreviewed | |
| Has patch: | no | Needs documentation: | no |
| Needs tests: | no | Patch needs improvement: | no |
| Easy pickings: | no | UI/UX: | no |
Description
#when i run this code:
from StudentsSite.Names.models import *
from django.utils import simplejson
lstSchoolCertificateNames = SchoolCertificateName.objects.values_list('school_certificate_name', flat=True)
serializedlist=simplejson.dumps(lstSchoolCertificateNames, encoding='utf-8');
#this is given as error:
Environment:
Request Method: GET
Request URL: http://localhost:8000/StudentsSite/Students/Search/
Django Version: 1.0-alpha-SVN-8161
Python Version: 2.5.2
Installed Applications:
['django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'StudentsSite.Students',
'django.contrib.admin',
'django.contrib.databrowse',
'StudentsSite.Names']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.middleware.doc.XViewMiddleware')
Traceback:
File "C:\Python25\lib\site-packages\django\core\handlers\base.py" in get_response
- response = callback(request, *callback_args, callback_kwargs)
File "C:\Users\shavin\django\StudentsSite\..\StudentsSite\Students\views.py" in searchForm
- lstSchoolCertificateNames2=simplejson.dumps(lstSchoolCertificateNames, encoding='utf-8');
File "C:\Python25\lib\site-packages\django\utils\simplejson\init.py" in dumps
- return _default_encoder.encode(obj)
File "C:\Python25\lib\site-packages\django\utils\simplejson\encoder.py" in encode
- chunks = list(self.iterencode(o))
File "C:\Python25\lib\site-packages\django\utils\simplejson\encoder.py" in _iterencode
- for chunk in self._iterencode_default(o, markers):
File "C:\Python25\lib\site-packages\django\utils\simplejson\encoder.py" in _iterencode_default
- newobj = self.default(o)
File "C:\Python25\lib\site-packages\django\utils\simplejson\encoder.py" in default
- raise TypeError("%r is not JSON serializable" % (o,))
Exception Type: TypeError at /StudentsSite/Students/Search/
Exception Value: [u'icse'] is not JSON serializable
#AND when this is done
from StudentsSite.Names.models import *
from django.core.serializers import serialize
lstSchoolCertificateNames = SchoolCertificateName.objects.values_list('school_certificate_name', flat=True)
serializedlist=serialize('json',lstSchoolCertificateNames, encoding='utf-8')
#it gives this error:
Environment:
Request Method: GET
Request URL: http://localhost:8000/StudentsSite/Students/Search/
Django Version: 1.0-alpha-SVN-8161
Python Version: 2.5.2
Installed Applications:
['django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'StudentsSite.Students',
'django.contrib.admin',
'django.contrib.databrowse',
'StudentsSite.Names']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.middleware.doc.XViewMiddleware')
Traceback:
File "C:\Python25\lib\site-packages\django\core\handlers\base.py" in get_response
- response = callback(request, *callback_args, callback_kwargs)
File "C:\Users\shavin\django\StudentsSite\..\StudentsSite\Students\views.py" in searchForm
- lstSchoolCertificateNames2=serialize('json', lstSchoolCertificateNames)
File "C:\Python25\lib\site-packages\django\core\serializers\init.py" in serialize
- s.serialize(queryset, options)
File "C:\Python25\lib\site-packages\django\core\serializers\base.py" in serialize
- for field in obj._meta.local_fields:
Exception Type: AttributeError at /StudentsSite/Students/Search/
Exception Value: 'unicode' object has no attribute '_meta'
#and i also found that values_list() function was returning an object of the type <django.db.models.query.ValuesListQuerySet >