[英]Django: <DjangoObject> is not JSON serializable
我最近在用我的testapp玩django,遇到了我從未遇到過的問題,我想尋求一些幫助
我有以下模型:
class Courses_list(models.Model):
abbreviation = models.CharField(max_length=100, unique=True)
course = models.CharField(max_length=100, unique=True)
class Job(models.Model):
job_Position = models.CharField(max_length=30, unique=True)
def __unicode__(self):
return self.job_Position
class Job_Posting(models.Model):
fkey = models.OneToOneField("Job")
class Educational_Requirement(models.Model):
fkey = models.ForeignKey('Job_Posting')
course = models.ForeignKey('Courses_list')
看起來像這樣的形式
class CourseField(forms.ModelChoiceField):
def label_from_instance(self, obj):
return obj.Course
class SomeForm(ModelForm):
course = CourseField(queryset=Educational_Requirement.objects.all())
保存后,我得到: <Job: Job_PositionValue> is not JSON serializable
我將表單數據保存在:
class SomeModel(models.Model):
course = models.CharField(max_length=50)
我究竟做錯了什么? 錯誤對我的問題意味着什么? 非常感謝。
編輯
這是回溯
Environment:
Request Method: POST
Request URL: http://localhost:8000/2/apply
Django Version: 1.8.2
Python Version: 2.7.10
Installed Applications:
('grappelli',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.sessions.models',
'frontend',
'file_maintenance',
'reports',
'transactions',
'admin_reorder',
'admin_notifications',
'django_twilio')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
'django.contrib.auth.models.User',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.security.SecurityMiddleware',
'admin_reorder.middleware.ModelAdminReorder')
Traceback:
File "C:\Python27\lib\site-packages\django\core\handlers\base.py" in get_response
223. response = middleware_method(request, response)
File "C:\Python27\lib\site-packages\django\contrib\sessions\middleware.py" in process_response
50. request.session.save()
File "C:\Python27\lib\site-packages\django\contrib\sessions\backends\db.py" in save
58. session_data=self.encode(self._get_session(no_load=must_create)),
File "C:\Python27\lib\site-packages\django\contrib\sessions\backends\base.py" in encode
88. serialized = self.serializer().dumps(session_dict)
File "C:\Python27\lib\site-packages\django\core\signing.py" in dumps
90. return json.dumps(obj, separators=(',', ':')).encode('latin-1')
File "C:\Python27\lib\json\__init__.py" in dumps
250. sort_keys=sort_keys, **kw).encode(obj)
File "C:\Python27\lib\json\encoder.py" in encode
207. chunks = self.iterencode(o, _one_shot=True)
File "C:\Python27\lib\json\encoder.py" in iterencode
270. return _iterencode(o, 0)
File "C:\Python27\lib\json\encoder.py" in default
184. raise TypeError(repr(o) + " is not JSON serializable")
Exception Type: TypeError at /2/apply
Exception Value: <Job: System Admin> is not JSON serializable
編輯2
它與我的操作無關,因為我不知道是什么原因造成的
我發現了問題所在,就是我的request.session
我不知道為什么,但是將str()
與我要插入的值相加就可以了: request.session['SessionName'] = str(myvalue)
修復后的意見:
def save_page(request, job_id):
form = application_form(request.POST)
if request.method == 'POST':
cde = form.save(commit = False)
....
request.session['SessionName'] = str(cde.SomeField)
cde.save()
沒有您的查看代碼,很難查明您的問題。 但是該錯誤很容易解釋。 嘗試將Django對象的屬性設置為字典,然后序列化該字典。
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