django.core.exceptions.ValidationError: ["'' 不是有效的 UUID。"]

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django.core.exceptions.ValidationError: ["'' 不是有效的 UUID。"]

在尝试使用 Django Rest Framework 在 Django 中编写对象级权限时，我遇到了这个错误（底部的完整错误日志）

django.core.exceptions.ValidationError: ["'' is not a valid UUID."]

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错误来自获取查询，ship = Ship.objects.get(id=shipID)。见文件：

from rest_framework.permissions import BasePermission
from Ships.models import Ship

import logging

logging.basicConfig(format='%(levelname)s:%(message)s', level=logging.DEBUG)

class HasObjectLevelPermissions(BasePermission):
    def has_permission(self, request, view):
        if request.method == "GET":
            return True
        else:
            logging.debug("not a GET request")
            shipID = request.POST.get('id',None)
            try:
                ship = Ship.objects.get(id=shipID)  # This line is the issue
                return request.user.userprofile.ship.id == ship.id
            except:
                logging.debug("Error in finding ship when checking permissions")
        return False

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下面是声明 UUID 的 Ship 模型。

class Ship(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    regNum = models.CharField(max_length=100, blank=False, db_index=True)
    year = models.IntegerField(blank=True)
    make = models.CharField(max_length=255)
    length = models.IntegerField(blank=True)
    beam = models.IntegerField(blank=True)
    fleet = models.ForeignKey(Fleet)
    created = models.DateTimeField(auto_now_add=True, db_index=True)

    def getRegNum(self):
        return self.regNum

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调试尝试

更改ship = Ship.objects.get(id=shipID)为ship = Ship.objects.get(id="some string")使验证错误消失。
更改ship = Ship.objects.get(id=shipID)为ship = Ship.objects.get(id="")使验证错误消失。这个很有趣，因为一个空字符串通过了验证。
更改shipID = request.POST.get('id',None)为shipID = request.GET.get('id',None)使验证错误消失。
我已经记录了从 POST 请求传入的 uuid，它确实是一个格式正确的 uuid（见下文）

我已尝试按照此处的建议删除整个 Postgres 数据库以及迁移。
我在每个表上都运行了“SELECT * FROM”以确保没有表有空的 uuid
我已经咨询了官方的文档下class UUIDField(Field):。
从 POST 正文记录 id。

System check identified no issues (0 silenced). June 21, 2017 - 00:44:24 Django version 1.11.1, using settings 'First_REST_API.settings' Starting development server at http://127.0.0.1:8000/ Quit the server with CTRL-BREAK. DEBUG:CHECKING PERMISSIONS DEBUG:not a GET request DEBUG:6b25b0be-610a-49f5-ad60-6df9564185a0 Internal Server Error: /ships Traceback (most recent call last): '''Same error as below'''

本质上，我正在尝试检索与 ID 匹配的 Ship 对象。这种类型的查询过去一直使用字符串，不确定为什么验证错误不断出现。有任何想法吗？

完整的错误日志

Internal Server Error: /ships
Traceback (most recent call last):
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\fields\__init__.py", line 2392, in to_python
    return uuid.UUID(value)
  File "C:\Users\ptao\AppData\Local\Programs\Python\Python36-32\lib\uuid.py", line 140, in __init__
    raise ValueError('badly formed hexadecimal UUID string')
ValueError: badly formed hexadecimal UUID string

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\core\handlers\exception.py", line 41, in inner
    response = get_response(request)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\core\handlers\base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\core\handlers\base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\views\decorators\csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\views\generic\base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\rest_framework\views.py", line 489, in dispatch
    response = self.handle_exception(exc)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\rest_framework\views.py", line 449, in handle_exception
    self.raise_uncaught_exception(exc)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\rest_framework\views.py", line 486, in dispatch
    response = handler(request, *args, **kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\ViaDjango\First_REST_API\Ships\views.py", line 110, in delete
    ship = Ship.objects.get(id=id)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\query.py", line 374, in get
    num = len(clone)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\query.py", line 232, in __len__
    self._fetch_all()
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\query.py", line 1103, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\query.py", line 53, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\compiler.py", line 863, in execute_sql
    sql, params = self.as_sql()
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\compiler.py", line 420, in as_sql
    where, w_params = self.compile(self.where) if self.where is not None else ("", [])
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\compiler.py", line 373, in compile
    sql, params = node.as_sql(self, self.connection)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\where.py", line 79, in as_sql
    sql, params = compiler.compile(child)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\compiler.py", line 373, in compile
    sql, params = node.as_sql(self, self.connection)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\lookups.py", line 170, in as_sql
    rhs_sql, rhs_params = self.process_rhs(compiler, connection)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\lookups.py", line 103, in process_rhs
    return self.get_db_prep_lookup(value, connection)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\lookups.py", line 196, in get_db_prep_lookup
    [get_db_prep_value(value, connection, prepared=True)]
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\fields\__init__.py", line 2383, in get_db_prep_value
    value = self.to_python(value)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\fields\__init__.py", line 2397, in to_python
    params={'value': value},
django.core.exceptions.ValidationError: ["'' is not a valid UUID."]
ERROR:Internal Server Error: /ships
Traceback (most recent call last):
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\fields\__init__.py", line 2392, in to_python
    return uuid.UUID(value)
  File "C:\Users\ptao\AppData\Local\Programs\Python\Python36-32\lib\uuid.py", line 140, in __init__
    raise ValueError('badly formed hexadecimal UUID string')
ValueError: badly formed hexadecimal UUID string

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\core\handlers\exception.py", line 41, in inner
    response = get_response(request)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\core\handlers\base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\core\handlers\base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\views\decorators\csrf.py", line 58, in wrapped_view
    return view_func(*args, **kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\views\generic\base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\rest_framework\views.py", line 489, in dispatch
    response = self.handle_exception(exc)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\rest_framework\views.py", line 449, in handle_exception
    self.raise_uncaught_exception(exc)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\rest_framework\views.py", line 486, in dispatch
    response = handler(request, *args, **kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\ViaDjango\First_REST_API\Ships\views.py", line 110, in delete
    ship = Ship.objects.get(id=id)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\query.py", line 374, in get
    num = len(clone)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\query.py", line 232, in __len__
    self._fetch_all()
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\query.py", line 1103, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\query.py", line 53, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\compiler.py", line 863, in execute_sql
    sql, params = self.as_sql()
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\compiler.py", line 420, in as_sql
    where, w_params = self.compile(self.where) if self.where is not None else ("", [])
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\compiler.py", line 373, in compile
    sql, params = node.as_sql(self, self.connection)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\where.py", line 79, in as_sql
    sql, params = compiler.compile(child)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\sql\compiler.py", line 373, in compile
    sql, params = node.as_sql(self, self.connection)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\lookups.py", line 170, in as_sql
    rhs_sql, rhs_params = self.process_rhs(compiler, connection)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\lookups.py", line 103, in process_rhs
    return self.get_db_prep_lookup(value, connection)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\lookups.py", line 196, in get_db_prep_lookup
    [get_db_prep_value(value, connection, prepared=True)]
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\fields\__init__.py", line 2383, in get_db_prep_value
    value = self.to_python(value)
  File "C:\Users\ptao\Desktop\ViaFleet\VirtualEnvironment\lib\site-packages\django\db\models\fields\__init__.py", line 2397, in to_python
    params={'value': value},
django.core.exceptions.ValidationError: ["'' is not a valid UUID."]
[21/Jun/2017 00:08:53] "DELETE /ships HTTP/1.1" 500 20510

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编辑该问题是由于 views.py 中的错误造成的。感谢@Sardorbek Imomaliev 指出这一点。id = request.GET.get('id', '')应该是id = request.POST.get('id', '')。请注意 request.POST 将包含 DELETE 请求正文。有关更多信息，请参阅此帖子下的评论。感谢所有帮助过的人。

class ShipEndpoint(generics.ListAPIView):
    permission_classes = (IsAuthenticated,HasObjectLevelPermissions)

    ''' get, post not shown'''

    def delete(self, request, format=None):
        id = request.GET.get('id', '')   #GET should have been DELETE
        ship = Ship.objects.get(id=id)
        # ship.fleet.numberOfShips = ship.fleet.numberOfShips - 1
        ship.fleet.save()
        return Response("success")
        # ship.delete()

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Answer 1

Sar*_*iev 6

您的问题是您正在尝试访问request.POST

shipID = request.POST.get('id',None)

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根据DELETE要求

[2017年6月21日00:08:53]“删除/ships HTTP/1.1”500 20510

您正在检查对象的权限，那么为什么不使用has_object_permission？http://www.django-rest-framework.org/api-guide/permissions/#examples

另外，在您的回溯中，它清楚地表明问题是您的views.py

文件“C:\Users\ptao\Desktop\ViaFleet\ViaDjango\First_REST_API\Ships\views.py”，第 110 行，删除ship = Ship.objects.get(id=id)

我们需要查看您的实际视图代码

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