Enum SchemaMigrationTransform 

pub enum SchemaMigrationTransform {
    Fill {
        to: FieldSourceKey,
        literal: ScalarLiteral,
    },
    Copy {
        from: FieldSourceKey,
        to: FieldSourceKey,
    },
    CheckedCast {
        from: FieldSourceKey,
        to: FieldSourceKey,
        target: ScalarType,
    },
    Coalesce {
        from: FieldSourceKey,
        to: FieldSourceKey,
        literal: ScalarLiteral,
    },
}

One closed deterministic historical-row transform declaration.

Variants

Fill

Fill one current target field with one exact typed literal.

Fields

to: FieldSourceKey

Current target field.

literal: ScalarLiteral

Exact target literal.

Copy

Copy one accepted-before field into one distinct current target field.

Fields

from: FieldSourceKey

Accepted-before source field.

to: FieldSourceKey

Current target field.

CheckedCast

Convert one scalar through the closed exact checked-cast matrix.

Fields

from: FieldSourceKey

Accepted-before source field.

to: FieldSourceKey

Current target field.

target: ScalarType

Exact current target scalar contract.

Coalesce

Preserve a non-null predecessor value or use one exact fallback.

Fields

from: FieldSourceKey

Accepted-before optional source field.

to: FieldSourceKey

Current required target field.

literal: ScalarLiteral

Exact fallback literal.

Implementations

impl SchemaMigrationTransform

pub const fn target(&self) -> &FieldSourceKey

Borrow the current target field.

Trait Implementations

impl Clone for SchemaMigrationTransform

fn clone(&self) -> SchemaMigrationTransform

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SchemaMigrationTransform

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

Formats the value using the given formatter.

impl Eq for SchemaMigrationTransform

impl PartialEq for SchemaMigrationTransform

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SchemaMigrationTransform