模型妈咪:多个食谱与一个食谱有外键关系

Question

我使用ModelMommy已经有一段时间了，但我不知道如何正确地做到这一点。

让我们假设一个简单的关系:

class Organization(models.Model):
    label = models.CharField(unique=True)
class Asset(models.Model):
    organization = models.ForeignKey(Organization)
    label = models.CharField(unique=True)

和食谱:

from model_mommy.recipe import Recipe, foreign_key

organization_recipe = Recipe(Organization, label='My Organization') 
asset1_recipe = Recipe(Asset,
                      organization=foreign_key(organization_recipe),
                      label='asset 1')
asset2_recipe = Recipe(Asset,
                      organization=foreign_key(organization_recipe),
                      label='asset 2')

现在当我制作这些资产食谱时，我得到一个错误:

>> asset1 = asset1_recipe.make()
>> asset2 = asset2_recipe.make()
IntegrityError: duplicate key value violates unique constraint "organizations_organization_label_key"
DETAIL:  Key (label)=(My Organization) already exists.

这可以通过将asset1的组织作为参数提供给asset2的make方法来解决:

>> asset1 = asset1_recipe.make()
>> asset2 = asset2_recipe.make(organization=asset1.organization)

但是必须有一种更简单、更干净的方法来做到这一点。

编辑

基于Helgi的回答中的链接，我已经更改了我所有的食谱外键指向闭包:

def organization_get_or_create(**kwargs):
    """
    Returns a closure with details of the organization to be fetched from db or
    created. Must be a closure to ensure it's executed within a test case
    Parameters
    ----------
    kwargs
        the details of the desired organization
    Returns
    -------
    Closure
        which returns the desired organization
    """
    def get_org():
        org, new = models.Organization.objects.get_or_create(**kwargs)
        return org
    return get_org
my_org = organization_get_or_create(label='My Organization')
asset1_recipe = Recipe(Asset,
                      organization=my_org,
                      label='asset 1')
asset2_recipe = Recipe(Asset,
                      organization=my_org,
                      label='asset 2')

并且可以创建任意多的资产:

>> asset1 = asset1_recipe.make()
>> asset2 = asset2_recipe.make()

Answer 1

这似乎是不可能的(至少现在)，但这个特性已经讨论过了。引用相同的foreign_key对象