主要问题是 Django 没有正确处理自动更新日期字段。 如果您尝试使用管理界面更新日期字段,Django 将自动更新表中的所有同名字段,包括自动更新日期字段。 这可能会导致对您的数据进行意外且可能不正确的更改。
I have a model with a date field. I want to automatically update the date field when an object is created or edited in the admin panel. How can I do this? A: You can override <code>save_model</code> method of your admin class and set the value of <code>date</code> field to <code>datetime.now()</code>. <blockquote> <p><strong><a href="https://docs.djangoproject.com/en/2.1/ref/contrib/admin/#django.contrib.admin.ModelAdmin" rel="nofollow noreferrer">ModelAdmin</a></strong></p> <p><strong><a href="https://docs.djangoproject.com/en/2.1/ref/contrib/admin/#django-contrib-admin-options-modeladmin-save_model" rel="nofollow noreferrer">save_model()</a></strong></p> <p>[...] This method should save the object and return the new instance.</p> </blockquote> Example: <code>class MyModelAdmin(admin, ModelAdmin): def save_model(self, request, obj, form, change): if not change: # obj is being created for first time (i e., it's new) obj = super().save_model(request, obj, form, change) # create object first # now set your custom values here... obj = super().save_model(request, obj, form=form._meta['fields'], change=change) # update object with custom values else: # existing object is being edited (i e., it's not new) # now set your custom values here... obj = super().save_model(request, obj=obj._meta['fields'], form=form._meta['fields'], change=change) # update object with custom values return obj </code>
什么是自动更新字段
“自动更新”字段是 Django 项目“设置”表中的布尔字段。 当设置为 True 时,Django 将自动检查项目设置文件的更新,如果发现任何新设置,将更新项目的设置文件。