如何在Django中插入从另一个模型继承的模型

Question

我有以下模特：

class Category(models.Model):
    title = models.CharField(max_length=200)

class Page(models.Model):
    title = models.CharField(max_length=255)
    category = models.ForeignKey(Category)

class PageExt(Page):
    is_t = models.BooleanField()

一些＆＃39; Page＆＃39;已存在于数据库中。我需要创建＆＃39; PageExt＆＃39;某些＆＃39;类别＆＃39;来自存在＆＃39; Page＆＃39;。如何使用ORM和优化如bulk_create？

Answer 1

这个怎么样：

#categories are the objects you know you want to make PageExt for
pages = Page.objects.filter(category__in = categories)
page_exts = []
for page in pages:
    #Give some values for is_t since, null is not allowed assuming True for now
    page_exts.append(PageExt(is_t = True))
PageExt.objects.bulk_create(page_exts)