根据具有相同值的特定属性过滤 Django Queryset_A 和 Queryset_B

Question

1. 使用 Model_B 过滤 Model_A
2. Model_A的退货商品

class Model_A(models.Model):
    name = models.CharField()
    age = models.CharField()

class Model_B(models.Model):
    name = models.CharField()
    location = models.CharField()

def some_filter_function():
    return [list of Model_A items based on Model_B.name]

Answer 1

考虑到您无法将 Model 更改为使用外键，您可以尝试以下操作：

    my_items = []
    names = Model_b.objects.all()
    for name in names:
        name_b = name.name
        model_a = Model_a.objects.filter(name = name)
           for item in model_a:
               my_items.append(item)   

Answer 2

我同意@William Van Onsam 的观点。

如果你定义你的Model_A像

class Model_B(models.Model):
    name = models.CharField()
    location = models.CharField()

class Model_A(models.Model):
    name = models.CharField()
    age = models.CharField()
    b = models.ForeignKey(Model_B, on_delete=models.CASCADE)
    # NOTE you need to declare Model_B prior to Model_A, 
    # and then you can use Model_B as a parameter here.

然后你可以做

def some_filter_function():
    b = get_model_b()
    return Model_A.objects.filter(name=b.name)

在您看来 function。

Answer 3

考虑以下方法。

def some_filter_function():
    queryset = None
    if Model_B.objects.filter(name="Jorge").exists()
        queryset = Model_A.objects.all()
    return queryset