Enum SchemaChange 

pub enum SchemaChange {
    CreateEntity(Entity),
    RetireFieldConstraint {
        entity: String,
        field: String,
        constraint: FieldConstraint,
    },
    ConvertField {
        entity: String,
        previous: Field,
        field: Field,
    },
    WidenIntegerToDecimal {
        entity: String,
        field: String,
    },
    CopyJsonRecords {
        source_entity: String,
        source_field: String,
        source_filter: Predicate,
        section: String,
        target_entity: String,
        fields: Vec<String>,
    },
    PromoteIdentity {
        entity: String,
        field: String,
    },
    AddField {
        entity: String,
        field: Field,
    },
    AddUnique {
        entity: String,
        fields: Vec<String>,
    },
    AddIndex {
        entity: String,
        fields: Vec<String>,
    },
    AddConditionalIndex {
        entity: String,
        index: Index,
    },
    Seed {
        entity: String,
        values: Map<String, Value>,
    },
    SeedFrom {
        entity: String,
        absent_filter: Predicate,
        source_entity: String,
        source_filter: Predicate,
        fields: BTreeMap<String, String>,
        values: Map<String, Value>,
    },
    Backfill {
        entity: String,
        filter: Predicate,
        values: Map<String, Value>,
    },
    CopyField {
        entity: String,
        source: String,
        target: String,
        filter: Predicate,
    },
    DeleteWhere {
        entity: String,
        filter: Predicate,
    },
}

Additive schema changes with a backend-independent migration identity.

Variants

CreateEntity(Entity)

RetireFieldConstraint

Retires exactly one obsolete physical constraint absent from the logical field. Other historical constraints, records, identities and indexes remain intact.

Fields

entity: String

field: String

constraint: FieldConstraint

ConvertField

Converts stored values and the physical field using one shared lossless preflight.

Fields

entity: String

previous: Field

field: Field

WidenIntegerToDecimal

Widens an existing integer value to an exact two-place decimal without changing its name, identity, or historical value.

Fields

entity: String

field: String

CopyJsonRecords

Adopts declared records from a historical JSON array into typed storage. Source filtering and the explicit field list prevent importing unrelated app data or accepting unrecognized columns.

Fields

source_entity: String

source_field: String

source_filter: Predicate

section: String

target_entity: String

fields: Vec<String>

PromoteIdentity

Convert an existing single-column integer primary key into a generated key.

Fields

entity: String

field: String

AddField

Fields

entity: String

field: Field

AddUnique

Fields

entity: String

fields: Vec<String>

AddIndex

Fields

entity: String

fields: Vec<String>

AddConditionalIndex

Fields

entity: String

index: Index

Seed

Fields

entity: String

values: Map<String, Value>

SeedFrom

Creates a missing logical record from exactly one qualifying source row. Existing target records are preserved; absent or ambiguous sources fail closed.

Fields

entity: String

absent_filter: Predicate

source_entity: String

source_filter: Predicate

fields: BTreeMap<String, String>

values: Map<String, Value>

Backfill

Fields

entity: String

filter: Predicate

values: Map<String, Value>

CopyField

Fields

entity: String

source: String

target: String

filter: Predicate

DeleteWhere

Fields

entity: String

filter: Predicate

Trait Implementations

impl Clone for SchemaChange

fn clone(&self) -> SchemaChange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SchemaChange

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SchemaChange

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for SchemaChange

fn eq(&self, other: &SchemaChange) -> 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 Serialize for SchemaChange

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for SchemaChange