Hi What is the different between pre_save signal and post_save singal. I know post_save will emited after model instance saved, and pre_save is before the saving the instance[?] but what it the point of pre_save when we cannot access the object data before the data changes. I mean user try to change the model content, like body of a post in a blog. using pre_save signal would be reasonable if i can access the post's body before the changes or in other word before the actual save() happens. If i can't access to data before save() happends, So what is the point of pre_save ?
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