66 lines
2.0 KiB
Swift
66 lines
2.0 KiB
Swift
import Combine
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import GRDB
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import GRDBQuery
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/// A player request can be used with the `@Query` property wrapper in order to
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/// feed a view with a list of players.
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///
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/// For example:
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///
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/// struct MyView: View {
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/// @Query(LineRequest(ordering: .byName)) private var players: [Line]
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///
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/// var body: some View {
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/// List(players) { player in ... )
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/// }
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/// }
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var bookColumn = Column("book")
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struct LineRequest: Queryable {
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enum Ordering {
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case byScore
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case byName
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}
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/// The ordering used by the player request.
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var ordering: Ordering
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var book: String
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// MARK: - Queryable Implementation
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static var defaultValue: [Line] { [] }
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func publisher(in appDatabase: AppDatabase) -> AnyPublisher<[Line], Error> {
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// Build the publisher from the general-purpose read-only access
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// granted by `appDatabase.reader`.
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// Some apps will prefer to call a dedicated method of `appDatabase`.
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ValueObservation
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.tracking(fetchValue(_:))
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.publisher(
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in: appDatabase.reader,
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// The `.immediate` scheduling feeds the view right on
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// subscription, and avoids an undesired animation when the
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// application starts.
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scheduling: .immediate)
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.eraseToAnyPublisher()
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}
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// This method is not required by Queryable, but it makes it easier
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// to test LineRequest.
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func fetchValue(_ db: Database) throws -> [Line] {
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if book == "" {
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return try Line.filter(bookColumn == Line.randomBook()).fetchAll(db)
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} else {
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return try Line.filter(bookColumn == book).fetchAll(db)
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}
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// switch ordering {
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// case .byScore:
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// return try Line.all().fetchAll(db)
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// case .byName:
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// // return try Line.all().orderedByName().fetchAll(db)
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// return try Line.all().fetchAll(db)
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// }
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}
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}
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