Dictinct Row in queryset using Django Rest Framework - django

Question

I want to remove the duplicate row, distinct row in a Mysql DB.
"Prpk" has a relation with "MeteoZone" (meteozone).
I've a model like this :
class MeteoZone(models.Model):
name = models.CharField(max_length=45, unique=True)
communes = models.ManyToManyField(Commune, related_name='meteozone', blank=True)
massifs = models.ManyToManyField(Massif, related_name='meteozone', blank=True)
def __str__(self):
return self.name
class Prpk(models.Model):
begin = models.FloatField()
end = models.FloatField()
status = models.CharField(max_length=15)
# Relations
report = models.ForeignKey(Report, on_delete=models.PROTECT, unique=False)
meteozone = models.OneToOneField(MeteoZone, related_name='prpk', on_delete=models.PROTECT, null=False, unique=False)
highway = models.OneToOneField(Highway,related_name='prpk', on_delete=models.PROTECT, null=True, unique=False)
department = models.OneToOneField(Department,on_delete=models.PROTECT, null=True, unique=False)
def __str__(self):
return ("%s-%s" % (self.begin,self.end))
And a serializer :
class PrpkSerializer(serializers.ModelSerializer):
# Get 'meteozones', 'communes' and 'massifs'
meteozone = MeteozoneSerializer(read_only=True)
begin = serializers.FloatField()
end = serializers.FloatField()
status = serializers.CharField(max_length=15)
class Meta:
model = Prpk
fields = ('begin', 'end', 'status', 'meteozone')
ordering = ('begin', )
In my view, in the query_set, I want to display only the unique records.
class PRPKViewSet(viewsets.ModelViewSet):
"""
API endpoint that allows prpk to be viewed
"""
serializer_class = PrpkSerializer
queryset = Prpk.objects.all().order_by('begin').distinct()
# Authentification !
permission_classes = (IsAuthenticated,)
# Only 'get' method
http_method_names = ['get']
#method_decorator(vary_on_cookie)
#method_decorator(cache_page(60*60*1))
def dispatch(self, request, *args, **kwargs):
return super().dispatch(request, *args, **kwargs)
def get_queryset(self):
""" allow rest api to filter by submissions """
#queryset = Prpk.objects.all().order_by('begin').values_list('begin', flat=True).distinct()
queryset = Prpk.objects.all().order_by('begin').distinct()
highway = self.request.query_params.get('highway', None)
if highway is not None:
queryset = queryset.filter(highway=highway)
return queryset
Look at a part of records :
id begin end status commune_id department_id highway_id massif_id meteozone_id report_id
76 25 25.6 1 NULL 13 2 45 40 1
77 25 25.6 1 NULL 13 2 161 40 1
In this records, I just one only one record in json, but DRF returns 2 records, like this :
[
{
"begin": 25,
"end": 25.6,
"status": "1",
"meteozone": {
"communes": [],
"massifs": [
{
"id": 45,
"name": "abc"
},
{
"id": 161,
"name": "def"
}
],
"id": 40,
"name": "133"
}
},
{
"begin": 25,
"end": 25.6,
"status": "1",
"meteozone": {
"communes": [],
"massifs": [
{
"id": 45,
"name": "abc"
},
{
"id": 161,
"name": "def"
}
],
"id": 40,
"name": "133"
}
},
{
I add a "distinct" method, but it's not working. Can U help me please ? :)
F.