Python Django管理员:_str____返回非字符串(int类型)
我正在做一个家庭作业,在Django中创建一个API。在Django管理框架中单击链接时,我的两个模型出现以下错误:Python Django管理员:_str____返回非字符串(int类型),python,django,python-3.x,django-models,django-rest-framework,Python,Django,Python 3.x,Django Models,Django Rest Framework,我正在做一个家庭作业,在Django中创建一个API。在Django管理框架中单击链接时,我的两个模型出现以下错误: TypeError at /officer/ __str__ returned non-string (type int) Request Method: GET Request URL: http://127.0.0.1:8000/officer/ Django Version: 3.0.4 Exception Type: TypeError E
TypeError at /officer/
__str__ returned non-string (type int)
Request Method: GET
Request URL: http://127.0.0.1:8000/officer/
Django Version: 3.0.4
Exception Type: TypeError
Exception Value:
__str__ returned non-string (type int)
Exception Location: /usr/local/lib/python3.7/dist-packages/rest_framework/relations.py in display_value, line 221
Python Executable: /usr/bin/python3
Python Version: 3.7.5
Python Path:
Error during template rendering
In template /usr/local/lib/python3.7/dist-packages/rest_framework/templates/rest_framework/horizontal/select.html, error at line 15
__str__ returned non-string (type int)
我的其他型号似乎工作正常。下面是models.py中的一些代码:
class Subscriber(models.Model):
subscriberID = models.IntegerField(primary_key=True)
username = models.ForeignKey(UserInfo, on_delete=models.CASCADE)
subscriptiontypecode = models.ForeignKey(SubscriptionType, on_delete=models.CASCADE)
servicecode = models.ForeignKey(Service, on_delete=models.CASCADE)
requestdate = models.DateField()
startdate = models.DateField()
enddate = models.DateField()
motifofcancellation = models.CharField(max_length=64)
beneficiaryID = models.IntegerField()
def __str__(self):
return self.subscriberID
class TransferredSubscription(models.Model):
transferID = models.IntegerField(primary_key=True)
transferfrom = models.CharField(max_length=64)
transferto = models.CharField(max_length=64)
requestdate = models.DateField()
transferdate = models.DateField()
subscriberID = models.ForeignKey(Subscriber, on_delete=models.CASCADE)
def __str__(self):
return self.transferID
class Officer(models.Model):
officecode = models.ForeignKey(Office, on_delete=models.CASCADE)
subscriberID = models.ForeignKey(Subscriber, on_delete=models.CASCADE)
startdate = models.DateField()
enddate = models.DateField()
def __str__(self):
return self.officecode
TransferredSubscription工作正常。我尝试添加return str(self.officecode),但仍然会出现相同的错误
你知道为什么会发生这种情况吗
编辑:添加每个请求的错误回溯:
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/officer/
Django Version: 3.0.4
Python Version: 3.7.5
Installed Applications:
['synerd',
'backend',
'rest_framework',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Template error:
In template /usr/local/lib/python3.7/dist-packages/rest_framework/templates/rest_framework/horizontal/select.html, error at line 15
__str__ returned non-string (type int)
5 : <label class="col-sm-2 control-label {% if style.hide_label %}sr-only{% endif %}">
6 : {{ field.label }}
7 : </label>
8 : {% endif %}
9 :
10 : <div class="col-sm-10">
11 : <select class="form-control" name="{{ field.name }}">
12 : {% if field.allow_null or field.allow_blank %}
13 : <option value="" {% if not field.value %}selected{% endif %}>--------</option>
14 : {% endif %}
15 : {% for select in field.iter_options %}
16 : {% if select.start_option_group %}
17 : <optgroup label="{{ select.label }}">
18 : {% elif select.end_option_group %}
19 : </optgroup>
20 : {% else %}
21 : <option value="{{ select.value }}" {% if select.value|as_string == field.value|as_string %}selected{% endif %} {% if select.disabled %}disabled{% endif %}>{{ select.display_text }}</option>
22 : {% endif %}
23 : {% endfor %}
24 : </select>
25 :
Traceback (most recent call last):
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/core/handlers/base.py", line 145, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/core/handlers/base.py", line 143, in _get_response
response = response.render()
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/response.py", line 105, in render
self.content = self.rendered_content
File "/usr/local/lib/python3.7/dist-packages/rest_framework/response.py", line 70, in rendered_content
ret = renderer.render(self.data, accepted_media_type, context)
File "/usr/local/lib/python3.7/dist-packages/rest_framework/renderers.py", line 724, in render
context = self.get_context(data, accepted_media_type, renderer_context)
File "/usr/local/lib/python3.7/dist-packages/rest_framework/renderers.py", line 696, in get_context
'post_form': self.get_rendered_html_form(data, view, 'POST', request),
File "/usr/local/lib/python3.7/dist-packages/rest_framework/renderers.py", line 511, in get_rendered_html_form
return self.render_form_for_serializer(serializer)
File "/usr/local/lib/python3.7/dist-packages/rest_framework/renderers.py", line 521, in render_form_for_serializer
{'style': {'template_pack': 'rest_framework/horizontal'}}
File "/usr/local/lib/python3.7/dist-packages/rest_framework/renderers.py", line 372, in render
return template.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/backends/django.py", line 61, in render
return self.template.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 171, in render
return self._render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 163, in _render
return self.nodelist.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/defaulttags.py", line 209, in render
nodelist.append(node.render_annotated(context))
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/defaulttags.py", line 309, in render
return nodelist.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/library.py", line 192, in render
output = self.func(*resolved_args, **resolved_kwargs)
File "/usr/local/lib/python3.7/dist-packages/rest_framework/templatetags/rest_framework.py", line 87, in render_field
return renderer.render_field(field, style)
File "/usr/local/lib/python3.7/dist-packages/rest_framework/renderers.py", line 351, in render_field
return template.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/backends/django.py", line 61, in render
return self.template.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 171, in render
return self._render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 163, in _render
return self.nodelist.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/defaulttags.py", line 161, in render
values = self.sequence.resolve(context, ignore_failures=True)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 670, in resolve
obj = self.var.resolve(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 795, in resolve
value = self._resolve_lookup(context)
File "/home/ubuntu/.local/lib/python3.7/site-packages/django/template/base.py", line 857, in _resolve_lookup
current = current()
File "/usr/local/lib/python3.7/dist-packages/rest_framework/relations.py", line 215, in iter_options
self.get_choices(cutoff=self.html_cutoff),
File "/usr/local/lib/python3.7/dist-packages/rest_framework/relations.py", line 202, in get_choices
for item in queryset
File "/usr/local/lib/python3.7/dist-packages/rest_framework/relations.py", line 202, in <listcomp>
for item in queryset
File "/usr/local/lib/python3.7/dist-packages/rest_framework/relations.py", line 221, in display_value
return str(instance)
Exception Type: TypeError at /officer/
Exception Value: __str__ returned non-string (type int)
url.py
router.register('subscriber', views.SubscriberView)
router.register('transferredsubscription', views.TransferredSubscriptionView)
router.register('officer', views.OfficerView)
管理员
admin.site.register(Subscriber)
admin.site.register(TransferredSubscription)
admin.site.register(Officer)
序列化程序.py
class SubscriberSerializer(serializers.ModelSerializer):
class Meta:
model = Subscriber
fields = '__all__'
class TransferredSubscriptionSerializer(serializers.ModelSerializer):
class Meta:
model = TransferredSubscription
fields = '__all__'
class OfficerSerializer(serializers.ModelSerializer):
class Meta:
model = Officer
fields = '__all__'
您还没有向我们展示您的
办公室
型号。由于officecode
是一个Office
对象,请确保您已在Office
模型中定义了\uu str\uuu()
方法。您可以将其强制转换为int
,以防万一
班级办公室(models.Model):
officecode=models.IntegerField(主键=True)
....
定义(自我):
return str(self.officecode)
回应您的评论: 我无法仅从堆栈跟踪(查看源代码)来确切说明问题发生的原因。另一个答案提到在pk上调用
str
,但这不起作用。要调试它,您需要在异常发生的地方放置一个断点,并沿着堆栈跟踪查看值是什么
File "/usr/local/lib/python3.7/dist-packages/rest_framework/relations.py", line 221, in display_value
return str(instance)
我最好的猜测是,它返回了一个看起来像数字的东西,并引发了一个错误
1) 尝试删除模型的所有\uuu str\uu
实现。因为基类做的事情足够好,所以不需要使用,除非你想让它更吸引人
2) 尝试在其中返回多个str(int)
,这样就不会被误解:
def __str__(self):
return "%s(%s)" % (self.__class__.__name__, self.pk)
我在django或drf中的任何地方都找不到这个特定错误,因此如果不直接调试它,我就没有建议了。您的
订阅者。\uuu str\uuu
也会返回一个int。更改:
def __str__(self):
return self.subscriberID
到
可以显示相应的视图吗?添加了views.py、url.py、admin.py、serializers.pyreturn str(self.transferId)中的一些片段,并将整数转换为字符串。为什么要在对象上定义这样的str方法?你是否在某种程度上依赖于这种行为,对于ID为“无”的新对象会发生什么情况?@AndrewBacker我浏览并注释了订阅者和办公模型上的def _ustr__;(self):但仍然存在同样的问题。。。然后我对我所有的模型都这样做了,现在一切都正常了——谢谢!
def __str__(self):
return self.subscriberID
def __str__(self):
return str(self.subscriberID)