Django ORM JOIN postgresql类型转换

Question

我试图使用Django的反向泛型关系通过Django的ORM访问和过滤相关对象。见以下声明的型号：

from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.db import models


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

    def __str__(self):
        return self.name


class Package(models.Model):
    name = models.CharField(max_length=500)
    status = models.ForeignKey(Status, on_delete=models.PROTECT)
    hst_entries = GenericRelation("myapp.StatusHistory", related_query_name="package")

    def __str__(self):
        return self.name


class StatusHistory(models.Model):
    content_type = models.ForeignKey(ContentType, on_delete=models.PROTECT)
    object_id = models.TextField()
    object = GenericForeignKey("content_type", "object_id")
    status = models.ForeignKey(Status, on_delete=models.PROTECT)
    entry_added = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return f"{self.content_type} - {self.object_id}: {self.status.name}"

正如您所看到的，Package和StatusHistory模型之间存在通用关系。为了从StatusHistory模型访问相关包，我尝试了：

StatusHistory.objects.filter(package__name__startswith="pack")

结果：

ProgrammingError: operator does not exist: text = integer
LINE 1: ...kage" ON ("myapp_statushistory"."object_id" = "myapp...
                                                             ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.

我知道PostgreSQL正在抱怨object_id（属于StatusHistory模型）和id（属于Package模型）字段之间的类型不匹配。这种不匹配可以通过PostgreSQL cast运算符::解决，如下所示：

### WRONG
join myapp_package on (myapp_statushistory.object_id = my_app_package.id)

### RIGHT
join myapp_package on (myapp_statushistory.object_id = my_app_package.id::varchar)

有没有可能通过Django的ORM制作这样的铸件

注意：将object_id字段转换为IntegerField不是我的选择