Merge pull request #7 from SwifQL/implement-conveniences

Table: implement convenience `all` and `first`

Sources/Bridges/Extensions/Table+Conveniences.swift

@@ -0,0 +1,32 @@
+//
+//  Table+Conveniences.swift
+//  Bridges
+//
+//  Created by Mihael Isaev on 09.05.2020.
+//
+
+import Logging
+import NIO
+import SwifQL
+
+extension Table {
+    private static func error(_ logger: Logger) {
+        logger.error(.init(stringLiteral: "Query doesn't work with non-generic database identifier. Please initialize AnyDatabaseIdentifier as MySQL or Postgres explicitly."))
+    }
+
+    public static func all(on db: DatabaseIdentifier, on: AnyBridgesObject) -> EventLoopFuture<[Self]> {
+        guard let db = db as? AnyDatabaseIdentifiable else {
+            error(on.logger)
+            return on.eventLoop.makeFailedFuture(BridgesError.nonGenericDatabaseIdentifier)
+        }
+        return db.all(Self.self, on: on)
+    }
+
+    public static func first(on db: DatabaseIdentifier, on: AnyBridgesObject) -> EventLoopFuture<Self?> {
+        guard let db = db as? AnyDatabaseIdentifiable else {
+            error(on.logger)
+            return on.eventLoop.makeFailedFuture(BridgesError.nonGenericDatabaseIdentifier)
+        }
+        return db.first(Self.self, on: on)
+    }
+}

Sources/Bridges/Protocols/AnyDatabaseIdentifiable.swift

@@ -8,7 +8,10 @@
 import SwifQL
 import NIO
 
-public protocol AnyDatabaseIdentifiable {}
+public protocol AnyDatabaseIdentifiable {
+    func all<T>(_ table: T.Type, on bridges: AnyBridgesObject) -> EventLoopFuture<[T]> where T: Table
+    func first<T>(_ table: T.Type, on bridges: AnyBridgesObject) -> EventLoopFuture<T?> where T: Table
+}
 public protocol AnyMySQLDatabaseIdentifiable: AnyDatabaseIdentifiable {}
 public protocol AnyPostgresDatabaseIdentifiable: AnyDatabaseIdentifiable {}