来自发送模型的 django post_save 调用？

Question

我有一个非常简单的模型：

class Badge(models.Model):

    name = models.CharField(max_length=16, help_text="Name for Badge")
    category = models.ForeignKey(BadgeCategory, help_text="Category for badge")
    description = models.CharField(max_length=32, help_text="A brief description")
    file = models.ImageField(upload_to=format_badge_name)

    signals.post_save.connect(create_badge, sender=Badge)

我知道我在 signals.py 中的 create_badge 函数有效。如果我在没有发送者值的情况下发送它，它表示发送者是一个 LogEntry 对象。我想/需要在 post_save 脚本中引用一些实例信息，如下所示：

def create_badge(sender, instance, created, **kwargs):

    from userinfuser.ui_api import UserInfuser
    from django.conf import settings

    if created:
        api_key = settings.API_KEY
        api_email = settings.API_EMAIL

        ui = UserInfuser(api_email, api_key)
        ui.create_badge(instance.category.name, instance.name, instance.description, instance.file.url)

我在哪里可以调用我的 post_save 调用，以便它知道徽章（我假设这是修复？

谢谢。

Answer 1

只需将信号与 sender=Badge 定义后连接信号，测试示例：

from django.db import models
from django.db.models import signals

def create_badge(sender, instance, created, **kwargs):
    print "Post save emited for", instance

class BadgeCategory(models.Model):
    name = models.CharField(max_length=100)

class Badge(models.Model):

    name = models.CharField(max_length=16, help_text="Name for Badge")
    category = models.ForeignKey(BadgeCategory, help_text="Category for badge")
    description = models.CharField(max_length=32, help_text="A brief description")

signals.post_save.connect(create_badge, sender=Badge)

测试 shell 会话：

In [1]: category = BadgeCategory(name='foo')

In [2]: category.save()

In [3]: badge = Badge(category=category, name='bar', description='test badge')

In [4]: badge.save()
Post save emited for Badge object