Struct MigrationGraph 

pub struct MigrationGraph {
    pub all: Vec<Migration>,
    pub order: Vec<String>,
    pub replaced_by: HashMap<String, String>,
}

Graph of visible (non-replaced) migrations, in topological order.

Fields

all: Vec<Migration>

All loaded migrations, including those replaced by a squash.

order: Vec<String>

Ids in topological order (replaced ids omitted).

replaced_by: HashMap<String, String>

replaced_id → squash_id.

Implementations

impl MigrationGraph

pub fn build(migrations: Vec<Migration>) -> Result<Self, MigrationError>

Validate dependencies, reject cycles and multiple heads, hide ids listed in any loaded migration’s replaces.

Errors

MigrationError::MissingDependency, MigrationError::Cycle, MigrationError::MultipleHeads.

pub fn get(&self, id: &str) -> Option<&Migration>

Migration by id (including replaced ones).

pub fn visible(&self) -> impl Iterator<Item = &Migration>

Visible migrations in topological order.

pub fn project_state(&self) -> Result<ProjectState, MigrationError>

Replay visible migrations into a ProjectState.

Errors

MigrationError::State if an operation does not apply.

Trait Implementations

impl Clone for MigrationGraph

fn clone(&self) -> MigrationGraph

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MigrationGraph

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

Formats the value using the given formatter.