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Make Value an associated type of Queryable #49

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Merged
groue merged 1 commit into from
Dec 1, 2023
Merged

Make Value an associated type of Queryable #49

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10 changes: 4 additions & 6 deletions Sources/GRDBQuery/Queryable.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,9 @@ import Combine

// See Documentation.docc/Extensions/Queryable.md
public protocol Queryable: Equatable {
/// The type of the published values.
associatedtype Value

/// The type that provides database access.
///
/// Any type can fit, as long as the `Queryable` type can build a Combine
Expand All @@ -14,7 +17,7 @@ public protocol Queryable: Equatable {

/// The type of the Combine publisher of database values, returned
/// from ``publisher(in:)``.
associatedtype ValuePublisher: Publisher
associatedtype ValuePublisher: Publisher where ValuePublisher.Output == Value

/// The default value, used until the Combine publisher publishes its
/// initial value.
Expand All @@ -28,8 +31,3 @@ public protocol Queryable: Equatable {
/// - parameter database: Provides access to the database.
func publisher(in database: DatabaseContext) -> ValuePublisher
}

extension Queryable {
/// The type of the published values.
public typealias Value = ValuePublisher.Output
}