我正在尝试使用用户的officeid保存项目，但它向我抛出错误
值错误：无法将“〈CustomUser：admin@gmail.com"：“ClearanceItem.office”必须是“Office”示例。
我的customuser的id为1
而电子邮件是admin@gmail.com
最后是office id = 'OSA'
这是我的models.py

class CustomUser(AbstractBaseUser, PermissionsMixin):
        email = models.EmailField(_('email address'), unique=True)
        is_staff = models.BooleanField(default=False)
        is_active = models.BooleanField(default=True)
        date_joined = models.DateTimeField(default=timezone.now)
        userid = models.CharField(null=True, max_length=9)
        officeid = models.ForeignKey('Office', models.DO_NOTHING, db_column='officeid', blank=True, null=True)

        USERNAME_FIELD = 'email'
        REQUIRED_FIELDS = []

        objects = CustomUserManager()

class ClearanceItem(models.Model):
        cl_itemid = models.CharField(primary_key=True, max_length=20, default=get_default_id)
        studid = models.CharField(max_length=9, blank=True, null=True)
        office = models.ForeignKey('Office', models.DO_NOTHING, blank=True, null=True)
        sem = models.CharField(max_length=1, blank=True, null=True)
        sy = models.CharField(max_length=9, blank=True, null=True)
        remarks = models.TextField(blank=True, null=True)
        resolution = models.TextField(blank=True, null=True)
        resolve = models.BooleanField(default='False', blank=True, null=True)
        resolve_date = models.DateField(blank=True, null=True)
        resolve_by = models.CharField(max_length=8, blank=True, null=True)
        recorded_by = models.CharField(max_length=8, blank=True, null=True)
        record_date = models.DateField(auto_now_add = True, blank=True, null=True)

class Meta:
    managed = False
    db_table = 'clearance_item'

class Office(models.Model):
        office_id = models.CharField(primary_key=True, max_length=50)
        office_name = models.CharField(max_length=200)
        office_head = models.CharField(max_length=8, blank=True, null=True)
        designation = models.TextField(blank=True, null=True)
        office_parent = models.CharField(max_length=50, blank=True, null=True)
        deptlogo = models.TextField(blank=True, null=True)

class Meta:
    managed = False
    db_table = 'office'

这是我的views.py

class APIClerkView(generics.ListCreateAPIView):
    permission_classes = [IsAuthenticated]
    serializer_class = ClearanceItemSerialize

def perform_create(self, serializer):
    serializer.save(office=CustomUser.objects.get(officeid=self.request.user.officeid),
    recorded_by=self.request.user.userid)

根据我以前遇到的这个问题，我认为它不是抛出一个实际的officeid，而是抛出一个字符串
我该如何补救或有其他解决方案吗
我在这里的目标是避免用户在字段中输入他们的办公室ID沿着其他详细信息。

{
        "sem": "1",
        "sy": "2022-2023",
        "remarks": "TEST",
        "resolution": "TEST",
        "studid": "2012-5037"
    }