Django：如何在Django 0.96中合并两个相关的查询器？ [英] Django: How to merge two related querysets in Django 0.96?

问题描述

我想将一个查询相关对象与另一个查询相关对象进行合并。
一些示例代码解释：

I would like to merge one querysets related objects with another querysets related objects. Some sample code to explain:

## Models
# sample models to illustrate problem
class PetShop(models.Model):
    id = models.AutoField(primary_key=True)
    shop_name = models.CharField(maxlength=255)
    cats = models.ManyToManyField(Cat)

class Cat(models.Model):
    id = models.AutoField(primary_key=True)
    cat_name = models.CharField(maxlength=50, blank=True)


## View
def MergePetsInShop(request):
    source_shop = PetShop.objects.get(pk=2)
    destination_shop = PetShop.objects.get(pk=3)

    #Somehow merge CATS from one shop to the other
    result = merge(source_shop.cats,destination_shop.cats)

    #save()

如何正确执行？

非常感谢。

推荐答案

您可以利用Django的多对多管理员功能添加 an d 删除接受任意数量的位置参数。在这种情况下，我将尝试：

You can take advantage of the fact that Django's many-to-many manager functions add and remove accept any number of positional arguments. In this case, I'd try:

destination_shop.cats.add(*source_shop.cats.all())

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