Photologue 的 Photo.get_previous_by_date_add() 方法在哪里定义？
Photologue 模型 Photo 的定义不包含方法 get_previous_by_date_added 及其父模型 ImageModel。 ImageModel 继承自 django models.Model 基类，该基类也没有此方法。
但是在 Photo 模型中可以使用此方法：
class Photo:
...
def get_previous_in_gallery(self, gallery):
try:
return self.get_previous_by_date_added(galleries__exact=gallery,
is_public=True)
except Photo.DoesNotExist:
return None
...
它的定义在哪里？ （链接到 Photologue models.py ）
Definition of Photologue model Photo doesn't contain method get_previous_by_date_added, as well as its parent model ImageModel. ImageModel inherits from django models.Model base class which hasn't this method too.
But there is usage of this method in Photo model:
class Photo:
...
def get_previous_in_gallery(self, gallery):
try:
return self.get_previous_by_date_added(galleries__exact=gallery,
is_public=True)
except Photo.DoesNotExist:
return None
...
Where its definition lives? (link to Photologue models.py)
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它是由
DateField的contribute_to_class方法添加的，如 模型实例参考 - 另请参阅django.db.models.fields。 __init__。许多 Django 的模型属性是由元类或外部类添加的，因此直接查看 models.Model 源并不总是有帮助。
It's added by the
contribute_to_classmethod ofDateField, as documented in the model instance reference - see also the code ofdjango.db.models.fields.__init__.A lot of Django's model attributes are added by metaclasses or by external classes, so it doesn't always help to look directly at the models.Model source.