如何在两个Django类之间共享Python方法？
如何在两个Django类之间共享Python方法？
提问于 2020-10-23 19:41:26
我的Django models.py文件中有两个类：
class ProfileManager(models.Manager):
def create_profile(self, user, member):
# Set default age to 100 years old when profile is created.
years_ago100 = datetime.datetime.now() - datetime.timedelta(days=101 * 365)
age = calculate_age(years_ago100) # <- Used here
profile = self.create(user=user, person_dob=years_ago100, person_age=age)
return
class Profile(models.Model):
person_dob = models.DateField()
person_age = models.IntegerField()
objects = ProfileManager()
def save(self, *args, **kwargs):
# Update to real age when user edits profile for the first time.
self.person_age = calculate_age(self.person_dob) # <- Used here too
super(Profile, self).save(*args, **kwargs)每个类都使用此calculate_age方法：
def calculate_age(born):
today = datetime.date.today()
return (today.year - born.year - ((today.month, today.day) < (born.month, born.day)))如何使两个类都可以访问此方法？一种简单的方法是将该方法变成这样的全局方法，但这似乎是一种简单的方法：
def calculate_age(born):
...
class ProfileManager(models.Manager):
...
class Profile(models.Model):
...而且，如果我想在这个特定的模型模块之外访问该方法，这是行不通的。在使用Django时，有标准的方法来做到这一点吗？
回答 2
Stack Overflow用户
发布于 2020-10-23 19:45:49
您可以将函数calculate_age保存到另一个文件中，然后将其导入到models.py文件的顶部。这将允许访问内部的所有类/方法/函数。
Stack Overflow用户
发布于 2020-10-23 20:22:49
可以尝试类似于多重继承之类的东西吗？不太确定这会比你所做的事情的全局功能更好。
class Profile(models.Model):
person_dob = models.DateField()
person_age = models.IntegerField()
objects = ProfileManager()
def save(self, *args, **kwargs):
# Update to real age when user edits profile for the first time.
self.person_age = self.calculate_age(self.person_dob) # <- Used here too
super(Profile, self).save(*args, **kwargs)
def calculate_age(born):
today = datetime.date.today()
return (today.year - born.year - ((today.month, today.day) < (born.month, born.day)))
class ProfileManager(models.Manager, Profile):
def create_profile(self, user, member):
# Set default age to 100 years old when profile is created.
years_ago100 = datetime.datetime.now() - datetime.timedelta(days=101 * 365)
age = self.calculate_age(years_ago100) # <- Used here
profile = self.create(user=user, person_dob=years_ago100, person_age=age)
return如果您不喜欢从您的Profile类继承整个models.Model，您可以创建一个共享类，它们都可以从中继承。
class Profile(models.Model, helpers):
person_dob = models.DateField()
person_age = models.IntegerField()
objects = ProfileManager()
def save(self, *args, **kwargs):
# Update to real age when user edits profile for the first time.
self.person_age = self.calculate_age(self.person_dob) # <- Used here too
super(Profile, self).save(*args, **kwargs)
class ProfileManager(models.Manager, helpers):
def create_profile(self, user, member):
# Set default age to 100 years old when profile is created.
years_ago100 = datetime.datetime.now() - datetime.timedelta(days=101 * 365)
age = self.calculate_age(years_ago100) # <- Used here
profile = self.create(user=user, person_dob=years_ago100, person_age=age)
return
class helpers():
def calculate_age(self, born):
today = datetime.date.today()
return (today.year - born.year - ((today.month, today.day) < (born.month, born.day)))
def other_shared_method(self):
pass页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/64506347
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