本文是小编为大家收集整理的关于用pre_save()填充django字段？的处理/解决方法，可以参考本文帮助大家快速定位并解决问题，中文翻译不准确的可切换到English标签页查看源文。
问题描述
class TodoList(models.Model):
title = models.CharField(maxlength=100)
slug = models.SlugField(maxlength=100)
def save(self):
self.slug = title
super(TodoList, self).save()
我假设以上是在将标题插入桌子上时如何创建和存储sl，如果没有，请纠正我！
无论如何，我一直在研究pre_save()作为另一种方法，但无法弄清楚它是如何工作的.您如何使用pre_save()?
它就像
def pre_save(self):
self.slug = title
我猜不.执行此操作的代码是什么?
谢谢！
推荐答案
您很可能是指 django的pre_save signal .您可以设置这样的东西:
from django.db.models.signals import pre_save
from django.dispatch import receiver
from django.template.defaultfilters import slugify
@receiver(pre_save)
def my_callback(sender, instance, *args, **kwargs):
instance.slug = slugify(instance.title)
如果您不在装饰符中包含发件人参数，例如@receiver(pre_save, sender=MyModel)，则将调用所有型号.
您可以将代码放在执行应用程序期间解析的任何文件中，models.py是一个很好的地方.
其他推荐答案
@receiver(pre_save, sender=TodoList)
def my_callback(sender, instance, *args, **kwargs):
instance.slug = slugify(instance.title)
其他推荐答案
您可以使用django Signals.pre_save:
from django.db.models.signals import post_save, post_delete, pre_save
class TodoList(models.Model):
@staticmethod
def pre_save(sender, instance, **kwargs):
#do anything you want
pre_save.connect(TodoList.pre_save, TodoList, dispatch_uid="sightera.yourpackage.models.TodoList")
问题描述
class TodoList(models.Model):
title = models.CharField(maxlength=100)
slug = models.SlugField(maxlength=100)
def save(self):
self.slug = title
super(TodoList, self).save()
I'm assuming the above is how to create and store a slug when a title is inserted into the table TodoList, if not, please correct me!
Anyhow, I've been looking into pre_save() as another way to do this, but can't figure out how it works. How do you do it with pre_save()?
is it like
def pre_save(self):
self.slug = title
I'm guessing no. What is the code to do this?
Thanks!
推荐答案
Most likely you are referring to django's pre_save signal. You could setup something like this:
from django.db.models.signals import pre_save
from django.dispatch import receiver
from django.template.defaultfilters import slugify
@receiver(pre_save)
def my_callback(sender, instance, *args, **kwargs):
instance.slug = slugify(instance.title)
If you dont include the sender argument in the decorator, like @receiver(pre_save, sender=MyModel), the callback will be called for all models.
You can put the code in any file that is parsed during the execution of your app, models.py is a good place for that.
其他推荐答案
@receiver(pre_save, sender=TodoList)
def my_callback(sender, instance, *args, **kwargs):
instance.slug = slugify(instance.title)
其他推荐答案
you can use django signals.pre_save:
from django.db.models.signals import post_save, post_delete, pre_save
class TodoList(models.Model):
@staticmethod
def pre_save(sender, instance, **kwargs):
#do anything you want
pre_save.connect(TodoList.pre_save, TodoList, dispatch_uid="sightera.yourpackage.models.TodoList")
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