Better handle equality checks of model types

Closes #8

Sources/BbcNews/Models/Discovery/FDTopicButton.swift

@@ -32,4 +32,13 @@ public struct FDTopicButton: Codable, Equatable, Hashable {
         self.resourceId = resourceId
         self.trackedEvents = trackedEvents
     }
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(self.resourceId)
+    }
+
+    // swiftlint:disable:next operator_whitespace
+    public static func ==(lhs: FDTopicButton, rhs: FDTopicButton) -> Bool {
+        return lhs.resourceId == rhs.resourceId
+    }
 }

Sources/BbcNews/Models/Discovery/FDTrackedEvent.swift

@@ -24,4 +24,13 @@ public struct FDTrackedEvent: Codable, Equatable, Hashable {
         self.event = event
         self.trackers = trackers
     }
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(self.event)
+    }
+
+    // swiftlint:disable:next operator_whitespace
+    public static func ==(lhs: FDTrackedEvent, rhs: FDTrackedEvent) -> Bool {
+        return lhs.event == rhs.event
+    }
 }

Sources/BbcNews/Models/Discovery/Link/FDLink.swift

@@ -24,4 +24,13 @@ public struct FDLink: Codable, Equatable, Hashable {
         self.destinations = destinations
         self.trackers = trackers
     }
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(self.destinations)
+    }
+
+    // swiftlint:disable:next operator_whitespace
+    public static func ==(lhs: FDLink, rhs: FDLink) -> Bool {
+        return lhs.destinations == rhs.destinations
+    }
 }

Sources/BbcNews/Models/Discovery/Link/FDLinkDestination.swift

@@ -55,4 +55,13 @@ public struct FDLinkDestination: Codable, Equatable, Hashable {
             return nil
         }
     }
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(self.id)
+    }
+
+    // swiftlint:disable:next operator_whitespace
+    public static func ==(lhs: FDLinkDestination, rhs: FDLinkDestination) -> Bool {
+        return lhs.id == rhs.id
+    }
 }

Sources/BbcNews/Models/Result/FDData.swift

@@ -32,4 +32,14 @@ public struct FDData: Codable, Equatable, Hashable {
         self.items = items
         self.trackers = trackers
     }
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(self.metadata)
+        hasher.combine(self.items)
+    }
+
+    // swiftlint:disable:next operator_whitespace
+    public static func ==(lhs: FDData, rhs: FDData) -> Bool {
+        return lhs.metadata == rhs.metadata && lhs.items == rhs.items
+    }
 }

Sources/BbcNews/Models/Story/FDVideoPortraitStory.swift

@@ -43,4 +43,13 @@ public struct FDVideoPortraitStory: Codable, Equatable, Hashable {
         self.subtext = subtext
         self.media = media
     }
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(self.id)
+    }
+
+    // swiftlint:disable:next operator_whitespace
+    public static func ==(lhs: FDVideoPortraitStory, rhs: FDVideoPortraitStory) -> Bool {
+        return lhs.id == rhs.id
+    }
 }

Sources/BbcNews/Models/Story/Media/FDMediaSource.swift

@@ -56,4 +56,13 @@ public struct FDMediaSource: Codable, Equatable, Hashable {
         self.canAutoPlay = canAutoPlay
         self.episodePid = episodePid
     }
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(self.id)
+    }
+
+    // swiftlint:disable:next operator_whitespace
+    public static func ==(lhs: FDMediaSource, rhs: FDMediaSource) -> Bool {
+        return lhs.id == rhs.id
+    }
 }