Enum FieldMigration 

pub enum FieldMigration {
    AddField {
        name: String,
        data_type: String,
        nullable: bool,
        default_value: FieldDefault,
    },
    DropField {
        name: String,
    },
    RenameField {
        from: String,
        to: String,
    },
    SetNullable {
        name: String,
        nullable: bool,
    },
}

A single field-level evolution operation.

Variants

AddField

Append a new field to the schema.

Existing records will have default_value substituted for the missing column.

Fields

name: String

data_type: String

nullable: bool

default_value: FieldDefault

DropField

Remove a field entirely; any data in that column is discarded.

Fields

name: String

RenameField

Rename a field in-place without changing its type or nullability.

Fields

from: String

to: String

SetNullable

Change the nullability of an existing field.

Fields

name: String

nullable: bool

Trait Implementations

impl Clone for FieldMigration

fn clone(&self) -> FieldMigration

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FieldMigration

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FieldMigration

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for FieldMigration

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

where __S: Serializer,

Serialize this value into the given Serde serializer.