Enum Phase 

pub enum Phase {
    PreDeploy,
    PostDeploy,
}

Deployment phase for a migration.

Migrations are split into phases for safe red-green deployments:

• PreDeploy: Runs BEFORE new code is deployed. Must be backward-compatible with the old code still running. Safe operations: add nullable columns, create new tables, add indexes.

• PostDeploy: Runs AFTER old code is fully terminated. Can include breaking changes. Operations: drop columns, rename columns, add NOT NULL constraints, drop tables.

Variants

PreDeploy

Runs before new code deployment (must be backward-compatible)

PostDeploy

Runs after old code is terminated (can be breaking)

Implementations

impl Phase

pub fn as_str(&self) -> &'static str

Trait Implementations

impl Clone for Phase

fn clone(&self) -> Phase

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Phase

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

Formats the value using the given formatter.

impl Default for Phase

fn default() -> Phase

Returns the “default value” for a type.

impl Display for Phase

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

Formats the value using the given formatter.

impl FromStr for Phase

type Err = String

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Phase, <Phase as FromStr>::Err>

Parses a string s to return a value of this type.

impl Hash for Phase

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Phase

fn eq(&self, other: &Phase) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Phase

impl Eq for Phase

impl StructuralPartialEq for Phase