django bulk_create support post_save signal

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django 默认 bulk_create 不支持 signal，可以通过自定义 models.Manager 支持这个特性

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class CustomManager(models.Manager):  
	 def bulk_create(self, items, **kwargs):  
		 for i in items:  
		 post_save.send(i.__class__, instance=i, created=True)  
		        return super().bulk_create(items, **kwargs)  
		  
		    def bulk_update(self, items, fields, **kwargs):  
		 super().bulk_update(items, fields, **kwargs)  
		        for i in items:  
		 post_save.send(i.__class__, instance=i, created=False)

使用实例:

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class Test(db.models):
	objects = CustomManager()
	...