Struct butane::migrations::MemMigrations

pub struct MemMigrations { /* private fields */ }

A collection of migrations stored in memory.

Implementations

impl MemMigrations

pub fn new() -> MemMigrations

pub fn from_json(json: &str) -> Result<MemMigrations, Error>

Trait Implementations

impl Debug for MemMigrations

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

Formats the value using the given formatter.

impl Default for MemMigrations

fn default() -> MemMigrations

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for MemMigrations

fn deserialize<__D>( __deserializer: __D ) -> Result<MemMigrations, <__D as Deserializer<'de>>::Error>where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Migrations for MemMigrations

type M = MemMigration

fn get_migration(&self, name: &str) -> Option<<MemMigrations as Migrations>::M>

Gets the migration with the given name, if it exists

fn latest(&self) -> Option<<MemMigrations as Migrations>::M>

Get the most recent migration (other than current) or None if no migrations have been created.

fn migrations_since( &self, since: &Self::M ) -> Result<Vec<Self::M, Global>, Error>

Returns migrations since the given migration.

fn all_migrations(&self) -> Result<Vec<Self::M, Global>, Error>

Returns all migrations

fn unapplied_migrations( &self, conn: &impl ConnectionMethods ) -> Result<Vec<Self::M, Global>, Error>

Get migrations which have not yet been applied to the database

fn last_applied_migration( &self, conn: &impl ConnectionMethods ) -> Result<Option<Self::M>, Error>

Get the last migration that has been applied to the database or None if no migrations have been applied

impl MigrationsMut for MemMigrations

fn current(&mut self) -> &mut <MemMigrations as Migrations>::M

Get a pseudo-migration representing the current state as determined by the last build of models. This does not necessarily match the current state of the database if migrations have not yet been applied.

fn clear_current(&mut self) -> Result<(), Error>

Clears the current state (as would be returned by the current method).

fn new_migration(&self, name: &str) -> <MemMigrations as Migrations>::M

Construct a new, uninitialized migration. You may want to use create_migration instead, which provides higher-level functionality.

fn add_migration( &mut self, m: <MemMigrations as Migrations>::M ) -> Result<(), Error>

Adds a migration constructed from new_migration into the set of migrations. Should be called after filling in the migration details. Unnecessary when using create_migration.

fn clear_migrations( &mut self, conn: &impl ConnectionMethods ) -> Result<(), Error>

Clears all migrations – deleting them from this object (and any storage backing it) and deleting the record of their existence/application from the database. The database schema is not modified, nor is any other data removed. Use carefully.

fn create_migration( &mut self, backend: &impl Backend, name: &str, from: Option<&Self::M> ) -> Result<bool, Error>

Create a migration from -> current named name. From may be None, in which case the migration is created from an empty database. Returns true if a migration was created, false if from and current represent identical states.

fn create_migration_to( &mut self, backend: &impl Backend, name: &str, from: Option<&Self::M>, to_db: ADB ) -> Result<bool, Error>

Create a migration from -> to_db named name. From may be None, in which case the migration is created from an empty database. Returns true if a migration was created, false if from and current represent identical states.

impl Serialize for MemMigrations

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

Serialize this value into the given Serde serializer.