Django Model Serializer manyToMany relationship

I have problem with Django 4.1.2 (Python 3.8.9). I have 2 entities: Idea and IdeaTheme, which have manyToMany relationship.

class Idea(models.Model):
    short_name = models.CharField(max_length=70)

    description = models.TextField(null=True,
                                   blank=True,
                                   default='')

    class State(models.IntegerChoices):
        CREATED = 0, _("Создано")
        TEAM_SEARCHING = 1, _("Поиск команды")
        IN_PROCESS = 2, _("Реализация")
        READY = 3, _("Готово")

    state = models.IntegerField(choices=State.choices,
                                default=State.CREATED)

    wanted_skills = models.ManyToManyField(to=UserSkill)


    themes = models.ManyToManyField(to=IdeaTheme,
                                    null=True,
                                    blank=True)

class IdeaTheme(models.Model):
    name = models.CharField(max_length=70,
                            verbose_name="Название")
    background_photo = models.ImageField(blank=True,
                                         null=True,
                                         verbose_name="Изображение для фронта")

Also I have ModelSerializer

class IdeaSerializer(serializers.ModelSerializer):
    class Meta:
        model = Idea
        fields = '__all__'
        depth = 1
        extra_kwargs = {
            'state': {
                'read_only': True
            },
            'pk': {
                'read_only': True
            }
        }

And when I using CreateAPIView in order to create Idea I face the problem, that I must provide IdeaTheme pks. But in the model there are Null and Blank option and I want to create idea without IdeaThemes.

I tried to specify IdeaTheme serializer inside IdeaSerializer like this, but Django still require not empty array of IdeaTheme.

themes = IdeaThemeSerializer(many=True, required=False)

Could someone help me, please, who already has experience using built-in serializers?

Back to Top