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This article mainly explains "what is the role of Acts_as_paranoid". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the role of Acts_as_paranoid".

Acts_as_paranoid

Its function is false deletion, and it will be very useful in practice. One day, the client said that she had deleted something by mistake and asked you to get it back, and then it came in handy.

Recycle bins or trash bins are also typical applications of fake deletions. If in a mailbox system, the user deletes the mail, at this time these messages are not deleted completely, it actually goes to the dustbin first, if you want to delete it completely, please go to the dustbin and delete it again

In fact, it does not actually delete the data in the data, but just hides it. As long as it cannot be seen by the user, it is tantamount to deletion. In fact, if you want to restore it, you can modify the database and come back.

The principle of its implementation is very simple, but it uses a flag to hide the data, add a field to the data table, change its value, it is deleted (hidden), modified back, it appears again.

Its purpose is to protect the security of the data, so that users can recover the data in the case of misoperation. However, the disadvantage is also obvious. because it is not really deleted, the database still retains that piece of data, and the database will become larger and larger, and there will be more and more junk information.

By default, the field "deleted_at" is specified with a parameter column, which can have three types: boolean, string, and time, which are specified with the column_type parameter.

Boolean: Boolean, which is true when deleted

String: string type. The value is "deleted" when deleted. This value can be specified with the deleted_value parameter.

Time: time type. The value when deleted is the current time (the time of the delete operation)

When the above three types are not deleted, the value is NULL (nil). It is recommended to use time type

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