Struct MigrationPlan 

pub struct MigrationPlan {
    pub steps: Vec<MigrationStep>,
    pub current_version: SchemaVersion,
    pub target_version: SchemaVersion,
}

An ordered sequence of MigrationSteps needed to reach a target version.

Fields

steps: Vec<MigrationStep>

Ordered steps to execute (current → target).

current_version: SchemaVersion

Starting schema version.

target_version: SchemaVersion

Desired schema version.

Implementations

impl MigrationPlan

pub fn build( current: SchemaVersion, target: SchemaVersion, available: &[MigrationStep], ) -> Result<Self, MigrationError>

Build a migration plan by finding a chain of steps from current to target.

Uses a simple BFS / greedy chain search: each step’s to_version must match the next step’s from_version.

pub fn step_count(&self) -> usize

Number of steps in the plan.

pub fn is_empty(&self) -> bool

Returns true when there are no steps to execute.

pub fn is_reversible(&self) -> bool

Returns true when every step in the plan is reversible.

Trait Implementations

impl Clone for MigrationPlan

fn clone(&self) -> MigrationPlan

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MigrationPlan

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

Formats the value using the given formatter.