Python 关系数据库模型中的Django-POST方法
我想为url中定义的用户ID创建Object2。下面示例中的GET方法工作正常,但我无法创建POST方法。我将非常感谢你的帮助。假设数据库中有免费的示例对象:Python 关系数据库模型中的Django-POST方法,python,django,python-3.x,django-models,django-rest-framework,Python,Django,Python 3.x,Django Models,Django Rest Framework,我想为url中定义的用户ID创建Object2。下面示例中的GET方法工作正常,但我无法创建POST方法。我将非常感谢你的帮助。假设数据库中有免费的示例对象: User: id Object1: id user_id Object2: id object1_id 在urls.py中,它看起来是这样的: url(r'^users/(?P<user_id>[0-9]+)/object2$', views.UserObject2), { "object3": 3,
User:
id
Object1:
id
user_id
Object2:
id
object1_id
在urls.py
中,它看起来是这样的:
url(r'^users/(?P<user_id>[0-9]+)/object2$', views.UserObject2),
{
"object3": 3,
"number": 123,
"date": "2017-06-07"
}
在视图.py中
:
from django.contrib.auth.models import User
class Object1(models.Model):
user = models.ForeignKey(User)
class Object2(models.Model):
object1 = models.ForeignKey(Object1)
object3 = models.ForeignKey(Object3, related_name='object2')
@api_view(['GET', 'POST'])
def UserObject2(request, user_id):
user = User.objects.get(id=user_id)
if request.method == 'POST':
serializer = Object2Serializer(data=request.data)
object1 = Object1.objects.get(user=user)
if serializer.is_valid():
serializer.save(object1=object1)
else:
return Response(serializer.errors)
else:
object2 = Object2.objects.filter(object1__user=user)
serializer = Object2Serializer(object2, many=True)
return Response(serializer.data)
from django.contrib.auth.models import User
class Object3Serializer(serializers.ModelSerializer):
class Meta:
model = Object3
depth = 1
fields = '__all__'
class UserSerializer(serializers.ModelSerializer):
def create(self, validated_data):
user = User.objects.create_user(**validated_data)
return user
class Meta:
model = User
fields = '__all__'
class Object2Serializer(serializers.ModelSerializer):
object3 = Object3Serializer(read_only=True)
class Meta:
model = Object2
fields = ('object3', 'number', 'date')
class Object1Serializer(serializers.ModelSerializer):
class Meta:
model = Object1
fields = '__all__'
在serializers.py中
:
from django.contrib.auth.models import User
class Object1(models.Model):
user = models.ForeignKey(User)
class Object2(models.Model):
object1 = models.ForeignKey(Object1)
object3 = models.ForeignKey(Object3, related_name='object2')
@api_view(['GET', 'POST'])
def UserObject2(request, user_id):
user = User.objects.get(id=user_id)
if request.method == 'POST':
serializer = Object2Serializer(data=request.data)
object1 = Object1.objects.get(user=user)
if serializer.is_valid():
serializer.save(object1=object1)
else:
return Response(serializer.errors)
else:
object2 = Object2.objects.filter(object1__user=user)
serializer = Object2Serializer(object2, many=True)
return Response(serializer.data)
from django.contrib.auth.models import User
class Object3Serializer(serializers.ModelSerializer):
class Meta:
model = Object3
depth = 1
fields = '__all__'
class UserSerializer(serializers.ModelSerializer):
def create(self, validated_data):
user = User.objects.create_user(**validated_data)
return user
class Meta:
model = User
fields = '__all__'
class Object2Serializer(serializers.ModelSerializer):
object3 = Object3Serializer(read_only=True)
class Meta:
model = Object2
fields = ('object3', 'number', 'date')
class Object1Serializer(serializers.ModelSerializer):
class Meta:
model = Object1
fields = '__all__'
我正以这种方式尝试,但在对象类object2(models.Model):
中,我对object3=models.ForeignKey(object3,related_name='object2')
有问题,也就是说,当我发送GET时,我会得到响应,例如:
[
{
"id": 14,
"object3": {
"sth1": 4,
"sth2": "response",
"sth3": "response1",
},
"number": 123,
"date": "2017-06-07",
}
]
但在POST中,我只想以这种方式发送object3的id:
url(r'^users/(?P<user_id>[0-9]+)/object2$', views.UserObject2),
{
"object3": 3,
"number": 123,
"date": "2017-06-07"
}
但此时我发现了一个奇怪的错误:
(1146, "Table 'name_of_my_table.i' doesn't exist")
但在我看来,帮助我似乎很困难。我不知道它为什么要查找I
表。我没有任何地方定义它。我甚至没有名为I
的对象
总而言之,我只想换一个职位。GET是正确的。有什么建议吗
完整堆栈跟踪:
Internal Server Error: /users/3/object2
Traceback (most recent call last):
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 101, in execute
return self.cursor.execute(query, args)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/cursors.py", line 247, in execute
res = self._query(query)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/cursors.py", line 374, in _do_query
db.query(q)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/connections.py", line 292, in query
_mysql.connection.query(self, query)
_mysql_exceptions.ProgrammingError: (1146, "Table 'name_of_my_table.i' doesn't exist")
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner
response = get_response(request)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
return view_func(*args, **kwargs)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/views/generic/base.py", line 68, in view
return self.dispatch(request, *args, **kwargs)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/rest_framework/views.py", line 489, in dispatch
response = self.handle_exception(exc)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/rest_framework/views.py", line 449, in handle_exception
self.raise_uncaught_exception(exc)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/rest_framework/views.py", line 486, in dispatch
response = handler(request, *args, **kwargs)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/rest_framework/decorators.py", line 52, in handler
return func(*args, **kwargs)
File "/Users/myUser/Projects/myProject/Folder/backend/folder/companies/views.py", line 442, in UserObject23
serializer.save(object1=object1)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/rest_framework/serializers.py", line 215, in save
self.instance = self.create(validated_data)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/rest_framework/serializers.py", line 916, in create
instance = ModelClass.objects.create(**validated_data)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/query.py", line 393, in create
obj.save(force_insert=True, using=self.db)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/base.py", line 806, in save
force_update=force_update, update_fields=update_fields)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/base.py", line 836, in save_base
updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/base.py", line 922, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/base.py", line 961, in _do_insert
using=using, raw=raw)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/query.py", line 1060, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1099, in execute_sql
cursor.execute(sql, params)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/backends/utils.py", line 80, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 101, in execute
return self.cursor.execute(query, args)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/cursors.py", line 247, in execute
res = self._query(query)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/cursors.py", line 374, in _do_query
db.query(q)
File "/Users/myUser/Projects/myProject/lib/python3.6/site-packages/MySQLdb/connections.py", line 292, in query
_mysql.connection.query(self, query)
django.db.utils.ProgrammingError: (1146, "Table 'name_of_my_table.i' doesn't exist")
[10/Jun/2017 09:45:32] "POST /users/3/object2 HTTP/1.1" 500 20503
按照@OP的要求重新编写我的答案 举个例子
@api_view(['GET', 'POST'])
def UserObject2(request, user_id):
user= User.objects.get(id=user_id)
if request.method == 'POST':
object1 = Object1.objects.get(user=user)
serializer = Object2PostSerializer(data=request.data)
if serializer.is_valid():
serializer.save(object1=object1)
else:
return Response(serializer.errors)
else:
object2 = Object2.objects.filter(object1__user=user)
serializer = Object2GetSerializer(object2, many=True)
return Response(serializer.data)
这只是一个例子,我没有尝试或测试过。我写这篇文章只是为了对你的案子有所了解。所以,如果有任何错误,请原谅
编辑
我建议为这两种方法分别编写序列化程序
class Object2GetSerializer(serializers.ModelSerializer):
object3 = Object3Serializer(read_only=True)
class Meta:
model = Object2
fields = ('object3', 'other_fields')
在序列化程序中为object3
设置字段选项read_only=True
,则该字段不会包含在请求的post方法中
class Object2PostSerializer(serializers.ModelSerializer):
class Meta:
model = Object2
fields = ('object3', 'object1', 'number', 'date')
你能尝试使用Object2Serializer(data=object2,many=True)吗?@Rayu我已经尝试过了,一切似乎都很好,但最终没有向数据库添加任何内容。我已将我的更改添加到帖子中。这只是一个示例,我有更复杂的对象、模型和数据库,但我希望看到示例,然后我将在我的项目中执行此操作,因此我将感谢URL中带有用户id的版本。我只需要用
request.method=='POST':
发布,因为我有更复杂的GET和works。很抱歉,我应该在前面提到它。many=True
表示需要传递一个dict列表,但您只传递了一个对象,这就是为什么错误出现的原因,它有帮助,但是在我看来,我有一个更复杂的问题,我已经在更新的帖子中描述过了。你能发布完整的堆栈跟踪吗?我看到你没有在post方法中从序列化程序中删除many=True