Django 常用常见问题

爱被打了一巴掌 2022-06-06 11:54 150阅读 0赞

#### models中，对sqlites数据更新时，updatetime不更新问题 ####

现象：使用批量更新的.update操作，数据更新了，但是updatetime不更新。而单独更新.save()则正常更新。

说明：auto\_now\_add will set the field to the current time when an object is created and auto\_now will set the field to the current time when an object is created or updated  
auto\_now\_add是在创建字段的时候会自动记录创建时间。  
auto\_now是在更新对象和更新的时候记录更新时间。

原因：The field is only automatically updated when calling Model.save(). The field isn’t updated when making updates to other fields in other ways such as QuerySet.update(), though you can specify a custom value for the field in an update like that.  
这个字段只有在调用Mode.save()时才会自动更新。当使用批量插入的QuerySet.update()不会更新该字段，你可以通过指定一个特定的值来更新该字段。

参考：[https://stackoverflow.com/questions/37716134/automatically-changing-django-model-field-on-update-for-one-field-and-freezing-o][https_stackoverflow.com_questions_37716134_automatically-changing-django-model-field-on-update-for-one-field-and-freezing-o]  
官方文档：[https://docs.djangoproject.com/en/1.9/ref/models/fields/\#django.db.models.DateField][https_docs.djangoproject.com_en_1.9_ref_models_fields_django.db.models.DateField]

#### url参数传递 ####

参考：[http://blog.csdn.net/alex\_chen\_16/article/details/50850435][http_blog.csdn.net_alex_chen_16_article_details_50850435]

[https_stackoverflow.com_questions_37716134_automatically-changing-django-model-field-on-update-for-one-field-and-freezing-o]: https://stackoverflow.com/questions/37716134/automatically-changing-django-model-field-on-update-for-one-field-and-freezing-o
[https_docs.djangoproject.com_en_1.9_ref_models_fields_django.db.models.DateField]: https://docs.djangoproject.com/en/1.9/ref/models/fields/#django.db.models.DateField
[http_blog.csdn.net_alex_chen_16_article_details_50850435]: http://blog.csdn.net/alex_chen_16/article/details/50850435