使用直通表在modelSerializer中创建多对多创建/更新

from django.db import models

# 定义直通表模型
class ThroughModel(models.Model):
    model1 = models.ForeignKey(Model1, on_delete=models.CASCADE)
    model2 = models.ForeignKey(Model2, on_delete=models.CASCADE)
    extra_field = models.CharField(max_length=100)

# 定义主模型
class Model1(models.Model):
    name = models.CharField(max_length=100)
    models2 = models.ManyToManyField(Model2, through=ThroughModel)

class Model2(models.Model):
    name = models.CharField(max_length=100)

# 创建多对多关系
model1 = Model1.objects.create(name='Model1')
model2 = Model2.objects.create(name='Model2')
ThroughModel.objects.create(model1=model1, model2=model2, extra_field='Extra Info')

# 更新多对多关系
through_model = ThroughModel.objects.get(model1=model1, model2=model2)
through_model.extra_field = 'Updated Info'
through_model.save()