Django order_by 不是查询结果的排序

Question

Django not ordering results by date. Am using Django-Rest-Framework to create API for app initially had a filter by on the query and after reading similar issues where people faced same problem when combining order_by and filter I removed the filter and manually filtered using a for loop but still keep getting the same results.

Initially query was:

progresslogs = ProgressLog.objects.filter(user__userprofile__coach=request.user).order_by('-date')

But reading similar issues I changed the query and filtered manually think there is an issue with using filter and order by together but am still getting the results out of order:

class ProgressLogAPI(APIView):
    def get(self, request: Request, format=None):
        if request.user.is_authenticated:
            if request.user.is_staff:
                logger.info('API: Staff {} fetched progress logs'.format(request.user.id))
                progresslogs = ProgressLog.objects.order_by('-date')
                # Below loop added to manually filter results
                filteredlogs = []
                for progress in progresslogs:
                    if progress.user.userprofile.coach == request.user:
                        filteredlogs.append(progress)

                serializer = ProgressLogSerializer(filteredlogs, many=True)
                return Response(data=serializer.data)

But in each case the results are coming out of order, wondering is this some bug in Django, I suppose could probably sort the results manually but am thinking this would drastically increase the time for the API call to get the results so don't really want to do this.

For reference the first 3 result from the API call are below with non applicable data replaced by aa '?' but can clearly from the date values that there not ordered at all:

[
  {
    "id":?,
    "user":?,
    "front_pic":"?",
    "side_pic":"?",
    "back_pic":"?",
    "weight":"?",
    "date":"2022-04-30",
    "bicep":null,
    "chest":null,
    "legs":null,
    "waist":null,
    "body_fat":null
  },
  {
     "id":?,
     "user":?,
    "front_pic":"?",
    "side_pic":"?",
    "back_pic":"?",
    "weight":"?",
    "date":"2022-03-27",
    "bicep":null,
    "chest":null,
    "legs":null,
    "waist":null,
    "body_fat":null
  },
  {
    "id":?,
    "user":?,
    "front_pic":"?",
    "side_pic":"?",
    "back_pic":"?",
    "weight":"?",
    "date":"2022-05-22",
    "bicep":null,
    "chest":null,
    "legs":null,
    "waist":null,
    "body_fat":null
  },
  ...
]

Django version on the server is 3.2.13 and python version is 3.9 .

EDIT: As requested here is the model and serialised:

Model:

class ProgressLog(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    front_pic = models.ImageField(upload_to='progress_front', blank=True)
    side_pic = models.ImageField(upload_to='progress_side', blank=True)
    back_pic = models.ImageField(upload_to='progress_back', blank=True)
    weight = models.DecimalField(blank=True, decimal_places=1, max_digits=6)
    date = models.DateField(default=get_date)
    body_fat = models.DecimalField(blank=True, decimal_places=1, max_digits=4, null=True)
    waist = models.IntegerField(blank=True, null=True)
    bicep = models.IntegerField(blank=True, null=True)
    chest = models.IntegerField(blank=True, null=True)
    legs = models.IntegerField(blank=True, null=True)

    def __str__(self):
        return '{} | {}'.format(self.user.username, self.date)

Serializer:

class ProgressLogSerializer(serializers.ModelSerializer):
    class Meta:
        model = ProgressLog
        fields = ['id', 'user', 'front_pic', 'side_pic', 'back_pic', 'weight', 'date', 'bicep', 'chest', 'legs', 'waist',
                  'body_fat']

Since posting the question last night I have tried updating Django to version 4.0.2 in case there was any bugs in the specific version of Django causing this, but results are still no ordered by date field.

Also checked by querying in the Django shell `python manage.py shell' on the server, and in this case the results are in order:

>>> from progress_logger.models import ProgressLog
>>> ProgressLog.objects.all().order_by('-date')[:3]
<QuerySet [<ProgressLog: ? | 2022-05-24>, <ProgressLog: ? | 2022-05-23>, <ProgressLog: ? | 2022-05-23>]>

Answer 1

Haven't been able to solve it the way I wanted but using ListViewAPI instead seems to have fixed it, guessing the problem might be related to Django-rest-framework as the results from the interactive shell where as expected:

class ProgressLogAPI(ListAPIView):
    permission_classes = [IsAdminUser]
    queryset = ProgressLog.objects.filter(user__userprofile__coach=request.user).order_by('-date')
    serializer_class = ProgressLogSerializer