Required Instance Methodgrdb 7.4.0GRDB
_makeFetcher
Returns a value that fetches database values upon changes in an observed database region. The returned value method must not depend on the state of the reducer.
func _makeFetcher() -> Fetcher Returns a value that fetches database values upon changes in an observed database region. The returned value method must not depend on the state of the reducer.
func _makeFetcher() -> Fetcher import GRDBA toolkit for SQLite databases, with a focus on application development
protocol _ValueReducerImplementation details of ValueReducer.
associatedtype Fetcher : _ValueReducerFetcherThe Sendable type that fetches database values
associatedtype Value : SendableThe type of observed values
mutating func _value(_ fetched: Fetcher.Value) throws -> Value? Transforms a fetched value into an eventual observed value. Returns nil when observer should not be notified.