zeus
21 lines
675 B
Swift
21 lines
675 B
Swift
extension ValueReducers {
|
|
/// A `ValueReducer` that perform database fetches.
|
|
public struct Fetch<Value>: ValueReducer {
|
|
private let __fetch: (Database) throws -> Value
|
|
|
|
/// Creates a reducer which passes raw fetched values through.
|
|
init(fetch: @escaping (Database) throws -> Value) {
|
|
self.__fetch = fetch
|
|
}
|
|
|
|
public func _fetch(_ db: Database) throws -> Value {
|
|
assert(db.isInsideTransaction, "Fetching in a non-isolated way is illegal")
|
|
return try __fetch(db)
|
|
}
|
|
|
|
public func _value(_ fetched: Value) -> Value? {
|
|
fetched
|
|
}
|
|
}
|
|
}
|