Django 如何创建;相关的“U名称”;与父模型的关系;透过「;模型(关于相关的\u名称继承)
我有4个型号,包括一个M2M“直通”型号,可实现索引:Django 如何创建;相关的“U名称”;与父模型的关系;透过「;模型(关于相关的\u名称继承),django,django-models,django-orm,Django,Django Models,Django Orm,我有4个型号,包括一个M2M“直通”型号,可实现索引: class TargetShape(models.Model): pass class Page(models.Model): target_shapes = models.ManyToManyField(TargetShape, through='PageElement', related_name='pages') class PageElement(models.Model): target
class TargetShape(models.Model):
pass
class Page(models.Model):
target_shapes = models.ManyToManyField(TargetShape, through='PageElement', related_name='pages')
class PageElement(models.Model):
target_shape = models.ForeignKey(TargetShape, related_name='page_elements')
page = models.ForeignKey(Page, related_name='page_elements')
index = models.PositiveIntegerField(verbose_name='Order')
class WorkingSession(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='working_sessions')
我定义了另一个模型解析
,它使我能够将所有这些模型链接在一起,以便创建以下相关的\u名称
关系:
working_session.resolutions
user.resolutions
target_shape.resolutions
page.resolutions
page_element.resolutions
user.resolutions
target_shape.resolutions
page.resolutions
为了让它工作,我必须声明:
class Resolution(models.Model):
# relations that would be needed from a DRY perspective:
page_element = models.ForeignKey(PageElement, related_name='resolutions')
working_session = models.ForeignKey(WorkingSession, related_name='resolutions')
# relations I want to exist to use user.resolutions, target_shape.resolutions, page.resolutions:
user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='resolutions')
target_shape = models.ForeignKey(TargetShape, related_name='resolutions')
page = models.ForeignKey(Page, related_name='resolutions')
然而,那不是很干燥。从枯燥的角度来看,我应该能够声明分辨率
仅链接到页面元素
和工作会话
,并推断/继承与父模型的关系:
class Resolution(models.Model):
page_element = models.ForeignKey(PageElement, related_name='resolutions')
working_session = models.ForeignKey(WorkingSession, related_name='resolutions')
但在这种情况下,我如何创建以下关系:
working_session.resolutions
user.resolutions
target_shape.resolutions
page.resolutions
page_element.resolutions
user.resolutions
target_shape.resolutions
page.resolutions
不经过:
user.working_sessions.resolutions
target_shape.page_elements.resolutions
page.page_elements.resolutions
我所能想到的就是:
- 或者像我已经做的那样声明所有字段
- 或者在User、TargetShape和Page models中声明一个属性,分别返回: Resolution.objects.filter(工作会话用户=self) Resolution.objects.filter(页面\元素\目标\形状=自身) Resolution.objects.filter(页面\元素\页面=自身)