ModelSerializer 使用知识点_serializer.save(project=obj) #外键一定要作为实例传入save函数，否则无法新增成功

1、有两个模型如下

A、project

class Project(models.Model):
    """
    项目表
    """
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=50, verbose_name='项目名称')
    version = models.CharField(max_length=50, verbose_name='版本')
    type = models.CharField(max_length=50, verbose_name='类型', choices=ProjectType)
    description = models.CharField(max_length=1024, blank=True, null=True, verbose_name='描述')
    status = models.BooleanField(default=True, verbose_name='状态')
    LastUpdateTime = models.DateTimeField(auto_now=True, verbose_name='最近修改时间')
    createTime = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
    user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, max_length=1024, verbose_name='创建人')

    def __unicode__(self):
        return self.name

    def __str__(self):
        return self.name

    class Meta:
        verbose_name = '项目'
        verbose_name_plural = '项目'

B、host （以project的id为外键）

class GlobalHost(models.Model):
    """
    host域名
    """
    id = models.AutoField(primary_key=True)
    project = models.ForeignKey(Project, on_delete=models.CASCADE, verbose_name='项目')
    name = models.CharField(max_length=50, verbose_name='名称')
    host = models.CharField(max_length=1024, verbose_name='Host地址')
    description = models.CharField(max_length=1024, blank=True, null=True, verbose_name='描述')
    status = models.BooleanField(default=True, verbose_name='状态')

    def get_relatedb(self):
        return HostRelateDB.objects.filter(user__post=self)

    def __unicode__(self):
        return self.name

    def __str__(self):
        return self.name

    class Meta:
        verbose_name = 'HOST'
        verbose_name_plural = 'HOST管理'

2、通过ModelSerializer新增host配置，序列化如下：

A、GlobalHostSerializer

class GlobalHostSerializer(serializers.ModelSerializer):
    """
    host信息关联序列化
    """

    class Meta:
        model = GlobalHost
        fields = ('id', 'project_id', 'name', 'host', 'status', 'description')


3、view中新增逻辑

print("add host data:", data) # data格式如下：{'project_id': 1, 'name': '1111', 'host': '111', 'description': '111'}

obj = Project.objects.get(id=data["project_id"])

serializer = GlobalHostSerializer(data=data)
with transaction.atomic():
    if serializer.is_valid():
        serializer.save()
        # 外键project_id
        serializer.save(project=obj)  #外键一定要作为实例传入save函数，否则无法新增成功