Trait MigrationTrait 

pub trait MigrationTrait:
    MigrationName
    + Send
    + Sync {
    // Required method
    fn up<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        manager: &'life1 SchemaManager<'life2>,
    ) -> Pin<Box<dyn Future<Output = Result<(), DbErr>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait;

    // Provided method
    fn down<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        _manager: &'life1 SchemaManager<'life2>,
    ) -> Pin<Box<dyn Future<Output = Result<(), DbErr>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait { ... }
}

A migration: a reversible schema change.

Required Methods

fn up<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, manager: &'life1 SchemaManager<'life2>, ) -> Pin<Box<dyn Future<Output = Result<(), DbErr>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Applies the migration inside the transaction manager wraps.

Errors

Returns DbErr::Driver when a statement fails; implementations may return any other variant to abort, and the transaction is rolled back.

Provided Methods

fn down<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _manager: &'life1 SchemaManager<'life2>, ) -> Pin<Box<dyn Future<Output = Result<(), DbErr>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Reverts the migration inside the transaction manager wraps.

Errors

The default returns DbErr::Migration unconditionally, marking the migration as irreversible; overriding implementations return DbErr::Driver when a statement fails.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors