add eagerLoaded property to relations (#109)

Author: tanner0101

Sources/FluentBenchmark/FluentBenchmarker.swift

@@ -145,10 +145,10 @@ public final class FluentBenchmarker {
             for galaxy in galaxies {
                 switch galaxy.name {
                 case "Milky Way":
-                    guard try galaxy.$planets.eagerLoaded().contains(where: { $0.name == "Earth" }) else {
+                    guard galaxy.planets.contains(where: { $0.name == "Earth" }) else {
                         throw Failure("unexpected missing planet")
                     }
-                    guard try !galaxy.$planets.eagerLoaded().contains(where: { $0.name == "PA-99-N2"}) else {
+                    guard !galaxy.planets.contains(where: { $0.name == "PA-99-N2"}) else {
                         throw Failure("unexpected planet")
                     }
                 default: break

Sources/FluentKit/Properties/Children.swift

@@ -81,6 +81,10 @@ public final class Children<From, To>: AnyProperty
 
 
 extension Children: EagerLoadable {
+    public var eagerLoaded: [To]? {
+        self.eagerLoadedValue
+    }
+
     public func eagerLoad<Model>(to builder: QueryBuilder<Model>)
         where Model: FluentKit.Model
     {
@@ -103,13 +107,6 @@ extension Children: AnyEagerLoadable {
         return self.eagerLoadedValue
     }
 
-    public func eagerLoaded() throws -> [To] {
-        guard let rows = self.eagerLoadedValue else {
-            throw FluentError.missingEagerLoad(name: To.schema.self)
-        }
-        return rows
-    }
-
     func eagerLoad(from eagerLoads: EagerLoads) throws {
         guard let request = eagerLoads.requests[self.eagerLoadKey] else {
             return

Sources/FluentKit/Properties/Parent+EagerLoad.swift

@@ -21,6 +21,10 @@ extension Parent: AnyEagerLoadable {
 }
 
 extension Parent: EagerLoadable {
+    public var eagerLoaded: To? {
+        self.eagerLoadedValue
+    }
+
     public func eagerLoad<Model>(to builder: QueryBuilder<Model>)
         where Model: FluentKit.Model
     {
@@ -59,6 +63,10 @@ extension OptionalParent: AnyEagerLoadable {
 }
 
 extension OptionalParent: EagerLoadable {
+    public var eagerLoaded: To? {
+        self.eagerLoadedValue
+    }
+
     public func eagerLoad<Model>(to builder: QueryBuilder<Model>)
         where Model: FluentKit.Model
     {

Sources/FluentKit/Properties/Property.swift

@@ -35,6 +35,8 @@ extension AnyField where Self: FieldRepresentable {
 }
 
 public protocol EagerLoadable {
+    associatedtype EagerLoadValue
+    var eagerLoaded: EagerLoadValue? { get }
     func eagerLoad<Model>(to builder: QueryBuilder<Model>)
         where Model: FluentKit.Model
 }

Sources/FluentKit/Properties/Siblings.swift

@@ -101,6 +101,10 @@ public final class Siblings<From, To, Through>: AnyProperty
 
 
 extension Siblings: EagerLoadable {
+    public var eagerLoaded: [To]? {
+        self.eagerLoadedValue
+    }
+
     public func eagerLoad<Model>(to builder: QueryBuilder<Model>)
         where Model: FluentKit.Model
     {
@@ -121,13 +125,6 @@ extension Siblings: AnyEagerLoadable {
         return self.eagerLoadedValue
     }
 
-    public func eagerLoaded() throws -> [To] {
-        guard let rows = self.eagerLoadedValue else {
-            throw FluentError.missingEagerLoad(name: To.schema.self)
-        }
-        return rows
-    }
-
     func eagerLoad(from eagerLoads: EagerLoads) throws {
         guard let request = eagerLoads.requests[self.eagerLoadKey] else {
             return