Enum UndoTarget 

pub enum UndoTarget {
    Last,
    Version(MigrationVersion),
    Count(usize),
}

How many / which versions to undo.

Last and Count walk the currently-applied versions in descending version order, which is not necessarily installation order — with out_of_order enabled a lower version can be installed later. Undo is defined on version order so that it is the inverse of migrate.

Variants

Last

Undo the highest currently-applied version.

Version(MigrationVersion)

Undo all migrations above this version (the target version itself stays applied).

Count(usize)

Undo the N highest currently-applied versions, highest first.

Trait Implementations

impl Clone for UndoTarget

fn clone(&self) -> UndoTarget

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UndoTarget

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.