AttributeError: "QuerySet" doesn't have attribute 'model'
AttributeError: "QuerySet" doesn't have attribute 'model'
我正在尝试使用 mongoengine 作为数据库创建一个基本的 django-rest-framework 后端。我已经成功地制作了一个基本的条目列表，它支持 POST 并根据需要对必填字段进行操作。
但是我遇到了这个 QuerySet 没有属性 'model' 的错误。我在网上看到的-人们在将过滤集合放入对象时会遇到这种错误。但是就我而言，情况有所不同（我相信）。
当我访问 /box/1 端点时出现错误。
源码如下：
models.py:
from __future__ import unicode_literals
import datetime
from mongoengine import Document, connect, EmbeddedDocument, fields, DynamicDocument
from django.db import models
# Create your models here.
from mongoengine import signals
connect('yourdb', alias='default')
class GPS(EmbeddedDocument):
lat = fields.FloatField(null=False, required=True)
lon = fields.FloatField(null=False, required=True)
class PPM(EmbeddedDocument):
time = fields.DateTimeField(default=datetime.datetime.now())
value = fields.IntField(null=False, required=True)
@classmethod
def pre_save(cls, sender, document, **kwargs):
document.time = datetime.datetime.now()
signals.pre_save.connect(PPM.pre_save, sender=PPM)
class BuyHistory(EmbeddedDocument):
time = fields.DateTimeField(default=datetime.datetime.now())
boxid = fields.StringField(max_length=128, null=False, required=True)
username = fields.StringField(max_length=128, null=False, required=True)
product = fields.StringField(max_length=128, null=False, required=True)
amount = fields.IntField()
@classmethod
def pre_save(cls, sender, document, **kwargs):
document.time = datetime.datetime.now()
signals.pre_save.connect(BuyHistory.pre_save, sender=BuyHistory)
class RecycleHistory(EmbeddedDocument):
time = fields.DateTimeField(default=datetime.datetime.now())
boxid = fields.StringField(max_length=128, null=False, required=True)
username = fields.StringField(max_length=128, null=False, required=True)
amount = fields.IntField()
@classmethod
def pre_save(cls, sender, document, **kwargs):
document.time = datetime.datetime.now()
signals.pre_save.connect(RecycleHistory.pre_save, sender=RecycleHistory)
class Box(Document):
boxid = fields.StringField(max_length=128, null=False, required=True)
gps = fields.EmbeddedDocumentField(GPS, required=True)
buy_history = fields.EmbeddedDocumentListField(BuyHistory, default='[]')
recycle_history = fields.EmbeddedDocumentListField(RecycleHistory, default='[]')
ppm_history = fields.EmbeddedDocumentListField(PPM, default='[]')
class User(Document):
username = fields.StringField(max_length=128, null=False, required=True)
rfid = fields.StringField(max_length=32, null=False, required=True)
buy_history = fields.EmbeddedDocumentListField(BuyHistory)
recycle_history = fields.EmbeddedDocumentListField(RecycleHistory)
serializers.py:
from rest_framework_mongoengine import serializers
from models import User, BuyHistory, Box, RecycleHistory, PPM
class UserSerializer(serializers.DocumentSerializer):
class Meta:
model = User
fields = ('username', 'rfid', 'buy_history', 'recycle_history')
class PPMSerializer(serializers.DocumentSerializer):
class Meta:
model = PPM
fields = ('time', 'value')
class BuyHistorySerializer(serializers.EmbeddedDocumentSerializer):
class Meta:
model = BuyHistory
fields = ('time', 'boxid', 'username', 'product', 'amount')
class RecycleHistorySerializer(serializers.EmbeddedDocumentSerializer):
class Meta:
model = RecycleHistory
fields = ('time', 'boxid', 'username', 'product', 'amount')
class BoxSerializer(serializers.DocumentSerializer):
class Meta:
model = Box
fields = ('boxid', 'gps', 'buy_history', 'recycle_history', 'ppm_history')
views.py:
from models import User, Box
from serializers import UserSerializer, BoxSerializer
from rest_framework import generics
# Create your views here.
class BoxList(generics.ListCreateAPIView):
queryset = Box.objects.all()
serializer_class = BoxSerializer
class UserList(generics.ListCreateAPIView):
queryset = User.objects.all()
serializer_class = UserSerializer
class BoxDetail(generics.RetrieveUpdateDestroyAPIView):
queryset = Box.objects.all()
serializer_class = BoxSerializer(partial=True)
class UserDetail(generics.RetrieveUpdateDestroyAPIView):
queryset = User.objects.all()
serializer_class = UserSerializer(partial=True)
urls.py:
from django.conf.urls import url
from django.contrib import admin
from server_api import views
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^box/$', views.BoxList.as_view()),
url(r'^box/(?P<pk>[0-9]+)$', views.BoxDetail.as_view()),
url(r'^user/$', views.UserList.as_view()),
]
settings.py:
import os
# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.10/howto/deployment/checklist/
# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '08v0)(rn8ae8%v9li=he7n9)50q5^wre8srx*m#0_idvcu=jew'
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True
ALLOWED_HOSTS = []
# Application definition
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'rest_framework',
'server_api.apps.ServerApiConfig'
]
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',
]
ROOT_URLCONF = 'pmi_pos_server_django.urls'
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
WSGI_APPLICATION = 'pmi_pos_server_django.wsgi.application'
# Database
# https://docs.djangoproject.com/en/1.10/ref/settings/#databases
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
}
}
# Password validation
# https://docs.djangoproject.com/en/1.10/ref/settings/#auth-password-validators
AUTH_PASSWORD_VALIDATORS = [
{
'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
},
]
# Internationalization
# https://docs.djangoproject.com/en/1.10/topics/i18n/
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'UTC'
USE_I18N = True
USE_L10N = True
USE_TZ = True
# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.10/howto/static-files/
STATIC_URL = '/static/'
版本：
此外，如果有人能推荐一个关于 Django 的非常详细的教程，我将不胜感激，我已经阅读了 Django-Rest-Framework 经典教程，quickstart 和 API-reference，但是我仍然觉得信息是对我来说还不够 - 如果有任何好的深入教程可以推荐 - 请去做。
编辑 1：
跟踪日志：
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 39, in inner
response = get_response(request)
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
return view_func(*args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/rest_framework/views.py", line 477, in dispatch
response = self.handle_exception(exc)
File "/usr/local/lib/python2.7/site-packages/rest_framework/views.py", line 437, in handle_exception
self.raise_uncaught_exception(exc)
File "/usr/local/lib/python2.7/site-packages/rest_framework/views.py", line 474, in dispatch
response = handler(request, *args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/rest_framework/generics.py", line 283, in get
return self.retrieve(request, *args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/rest_framework/mixins.py", line 56, in retrieve
instance = self.get_object()
File "/usr/local/lib/python2.7/site-packages/rest_framework/generics.py", line 97, in get_object
obj = get_object_or_404(queryset, **filter_kwargs)
File "/usr/local/lib/python2.7/site-packages/rest_framework/generics.py", line 20, in get_object_or_404
return _get_object_or_404(queryset, *filter_args, **filter_kwargs)
File "/usr/local/lib/python2.7/site-packages/django/shortcuts.py", line 92, in get_object_or_404
except queryset.model.DoesNotExist:
AttributeError: 'QuerySet' object has no attribute 'model'
你正在做这个
serializer_class = BoxSerializer(partial=True)
这是无效代码，因为您在这里实例化序列化程序，所以序列化程序实例将存储在 serializer_class 变量中，而不是 class
好的，我发现了一个问题 - 我更改了泛型导入 - 现在我正在使用 from rest_framework_mongoengine import generics。我假设冲突是它找不到 queryset 的 model 参数，因为它不在配置的默认数据库中。
我正在尝试使用 mongoengine 作为数据库创建一个基本的 django-rest-framework 后端。我已经成功地制作了一个基本的条目列表，它支持 POST 并根据需要对必填字段进行操作。
但是我遇到了这个 QuerySet 没有属性 'model' 的错误。我在网上看到的-人们在将过滤集合放入对象时会遇到这种错误。但是就我而言，情况有所不同（我相信）。
当我访问 /box/1 端点时出现错误。
源码如下：
models.py:
from __future__ import unicode_literals
import datetime
from mongoengine import Document, connect, EmbeddedDocument, fields, DynamicDocument
from django.db import models
# Create your models here.
from mongoengine import signals
connect('yourdb', alias='default')
class GPS(EmbeddedDocument):
lat = fields.FloatField(null=False, required=True)
lon = fields.FloatField(null=False, required=True)
class PPM(EmbeddedDocument):
time = fields.DateTimeField(default=datetime.datetime.now())
value = fields.IntField(null=False, required=True)
@classmethod
def pre_save(cls, sender, document, **kwargs):
document.time = datetime.datetime.now()
signals.pre_save.connect(PPM.pre_save, sender=PPM)
class BuyHistory(EmbeddedDocument):
time = fields.DateTimeField(default=datetime.datetime.now())
boxid = fields.StringField(max_length=128, null=False, required=True)
username = fields.StringField(max_length=128, null=False, required=True)
product = fields.StringField(max_length=128, null=False, required=True)
amount = fields.IntField()
@classmethod
def pre_save(cls, sender, document, **kwargs):
document.time = datetime.datetime.now()
signals.pre_save.connect(BuyHistory.pre_save, sender=BuyHistory)
class RecycleHistory(EmbeddedDocument):
time = fields.DateTimeField(default=datetime.datetime.now())
boxid = fields.StringField(max_length=128, null=False, required=True)
username = fields.StringField(max_length=128, null=False, required=True)
amount = fields.IntField()
@classmethod
def pre_save(cls, sender, document, **kwargs):
document.time = datetime.datetime.now()
signals.pre_save.connect(RecycleHistory.pre_save, sender=RecycleHistory)
class Box(Document):
boxid = fields.StringField(max_length=128, null=False, required=True)
gps = fields.EmbeddedDocumentField(GPS, required=True)
buy_history = fields.EmbeddedDocumentListField(BuyHistory, default='[]')
recycle_history = fields.EmbeddedDocumentListField(RecycleHistory, default='[]')
ppm_history = fields.EmbeddedDocumentListField(PPM, default='[]')
class User(Document):
username = fields.StringField(max_length=128, null=False, required=True)
rfid = fields.StringField(max_length=32, null=False, required=True)
buy_history = fields.EmbeddedDocumentListField(BuyHistory)
recycle_history = fields.EmbeddedDocumentListField(RecycleHistory)
serializers.py:
from rest_framework_mongoengine import serializers
from models import User, BuyHistory, Box, RecycleHistory, PPM
class UserSerializer(serializers.DocumentSerializer):
class Meta:
model = User
fields = ('username', 'rfid', 'buy_history', 'recycle_history')
class PPMSerializer(serializers.DocumentSerializer):
class Meta:
model = PPM
fields = ('time', 'value')
class BuyHistorySerializer(serializers.EmbeddedDocumentSerializer):
class Meta:
model = BuyHistory
fields = ('time', 'boxid', 'username', 'product', 'amount')
class RecycleHistorySerializer(serializers.EmbeddedDocumentSerializer):
class Meta:
model = RecycleHistory
fields = ('time', 'boxid', 'username', 'product', 'amount')
class BoxSerializer(serializers.DocumentSerializer):
class Meta:
model = Box
fields = ('boxid', 'gps', 'buy_history', 'recycle_history', 'ppm_history')
views.py:
from models import User, Box
from serializers import UserSerializer, BoxSerializer
from rest_framework import generics
# Create your views here.
class BoxList(generics.ListCreateAPIView):
queryset = Box.objects.all()
serializer_class = BoxSerializer
class UserList(generics.ListCreateAPIView):
queryset = User.objects.all()
serializer_class = UserSerializer
class BoxDetail(generics.RetrieveUpdateDestroyAPIView):
queryset = Box.objects.all()
serializer_class = BoxSerializer(partial=True)
class UserDetail(generics.RetrieveUpdateDestroyAPIView):
queryset = User.objects.all()
serializer_class = UserSerializer(partial=True)
urls.py:
from django.conf.urls import url
from django.contrib import admin
from server_api import views
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^box/$', views.BoxList.as_view()),
url(r'^box/(?P<pk>[0-9]+)$', views.BoxDetail.as_view()),
url(r'^user/$', views.UserList.as_view()),
]
settings.py:
import os
# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.10/howto/deployment/checklist/
# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '08v0)(rn8ae8%v9li=he7n9)50q5^wre8srx*m#0_idvcu=jew'
# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True
ALLOWED_HOSTS = []
# Application definition
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'rest_framework',
'server_api.apps.ServerApiConfig'
]
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',
]
ROOT_URLCONF = 'pmi_pos_server_django.urls'
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages',
],
},
},
]
WSGI_APPLICATION = 'pmi_pos_server_django.wsgi.application'
# Database
# https://docs.djangoproject.com/en/1.10/ref/settings/#databases
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
}
}
# Password validation
# https://docs.djangoproject.com/en/1.10/ref/settings/#auth-password-validators
AUTH_PASSWORD_VALIDATORS = [
{
'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
},
{
'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
},
]
# Internationalization
# https://docs.djangoproject.com/en/1.10/topics/i18n/
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'UTC'
USE_I18N = True
USE_L10N = True
USE_TZ = True
# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.10/howto/static-files/
STATIC_URL = '/static/'
版本：
此外，如果有人能推荐一个关于 Django 的非常详细的教程，我将不胜感激，我已经阅读了 Django-Rest-Framework 经典教程，quickstart 和 API-reference，但是我仍然觉得信息是对我来说还不够 - 如果有任何好的深入教程可以推荐 - 请去做。
编辑 1：
跟踪日志：
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/exception.py", line 39, in inner
response = get_response(request)
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
return view_func(*args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/rest_framework/views.py", line 477, in dispatch
response = self.handle_exception(exc)
File "/usr/local/lib/python2.7/site-packages/rest_framework/views.py", line 437, in handle_exception
self.raise_uncaught_exception(exc)
File "/usr/local/lib/python2.7/site-packages/rest_framework/views.py", line 474, in dispatch
response = handler(request, *args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/rest_framework/generics.py", line 283, in get
return self.retrieve(request, *args, **kwargs)
File "/usr/local/lib/python2.7/site-packages/rest_framework/mixins.py", line 56, in retrieve
instance = self.get_object()
File "/usr/local/lib/python2.7/site-packages/rest_framework/generics.py", line 97, in get_object
obj = get_object_or_404(queryset, **filter_kwargs)
File "/usr/local/lib/python2.7/site-packages/rest_framework/generics.py", line 20, in get_object_or_404
return _get_object_or_404(queryset, *filter_args, **filter_kwargs)
File "/usr/local/lib/python2.7/site-packages/django/shortcuts.py", line 92, in get_object_or_404
except queryset.model.DoesNotExist:
AttributeError: 'QuerySet' object has no attribute 'model'
你正在做这个
serializer_class = BoxSerializer(partial=True)
这是无效代码，因为您在这里实例化序列化程序，所以序列化程序实例将存储在 serializer_class 变量中，而不是 class
好的，我发现了一个问题 - 我更改了泛型导入 - 现在我正在使用 from rest_framework_mongoengine import generics。我假设冲突是它找不到 queryset 的 model 参数，因为它不在配置的默认数据库中。