Django：关系的“id”列中的 null 值违反非空约束

Question

I want to post data into my model in raw format. but every time I post data and pass the foreign key it returns null. I don't know why I tried everything. I passed the column as series: 2 and series_id:2 nothing's working. i don't know what i'm doing wrong.

This is my ViewSet

class SeasonViewSet(viewsets.ModelViewSet):
    queryset = Season.objects.all()
    permission_classes = [
        permissions.AllowAny
    ]
    serializer_class = SeasonSerializer

Serializers.py

class SeasonSerializer(serializers.ModelSerializer):
    series = StringRelatedField()
    class Meta:
        model = Season
        fields = '__all__'

Here's my model:

class Season(models.Model):
    name = models.CharField(max_length=100, blank=True)
    number = models.IntegerField()
    series = models.ForeignKey(Series, related_name="seasons", on_delete=models.CASCADE)
    artwork_vr = models.ImageField(upload_to="images/tv", blank=True, default="default/default_video.png")
    premiereDate = models.DateField(blank=True)
    endDate = models.DateField(blank=True)

This is how I'm posting data to API

    {
        "series": 2,
        "name": "Attack",
        "number": 2,
        "premiereDate": "2021-07-03",
        "endDate": "2021-07-03"
    }

and I get this error: null value in column "series_id" of relation "tvshow_season" violates not-null constraint DETAIL: Failing row contains (38, null, 4, default/default_video.png, 2021-07-03, , 2021-07-03).

---

Answer 1

change series = StringRelatedField() to series = PrimaryKeyRelatedField(queryset=Series.objects.all()) So you could post your data API that way.