Automatically update created_at & updated_at timestamp columns on update

[billy1624]

Motivation

This is a common feature for an ORM. Which "touch" these timestamp columns to record the last update timestamp and create at timestamp of a row.

Proposed Solutions

User can enable this feature by placing attribute on the corresponding field in the entity model.

#[derive(Clone, Debug, PartialEq, DeriveEntityModel)]
#[sea_orm(table_name = "cake")]
pub struct Model {
    #[sea_orm(primary_key)]
    pub id: i32,
    pub name: String,
    #[sea_orm(updated_at)]
    pub updated_at: Option<DateTimeWithTimeZone>,
    #[sea_orm(created_at)]
    pub created_at: Option<DateTimeWithTimeZone>,
}

For insert, the value of both updated_at and created_at will be set to CURRENT_TIMESTAMP.

For update, the value of updated_at will be set to CURRENT_TIMESTAMP.

User can override this behaviour by setting the value of it explicitly, i.e. Set(xxx).

Additional Information

Related Discussions:

• [Feature Request] Optimistic Locking #819

[baoyachi]

this feature is so useful. 👍 . I look forward to using it soon

[tyt2y3]

created_at should be an alias to on_insert = "current_timestamp". Merge into #1431