Shorten method body

Author: minacle

TweetNest/Shared/Previews/Extensions/TweetNestKit/PersistentContainer+Preview.swift

@@ -232,69 +232,31 @@ extension PersistentContainer {
                 userDetail.userID = latestUserDetail.userID
                 userDetail.username = latestUserDetail.username
             }
-            if let blockingUserIDs = previewUserDetail.blockingUserIDs {
-                userDetail.blockingUserIDs = blockingUserIDs
-            }
-            if let creationDate = previewUserDetail.creationDate {
-                userDetail.creationDate = creationDate
-            }
-            else {
-                userDetail.creationDate = .now
-            }
-            if let followerUserIDs = previewUserDetail.followerUserIDs {
-                userDetail.followerUserIDs = followerUserIDs
-            }
-            if let followerUsersCount = previewUserDetail.followerUsersCount {
-                userDetail.followerUsersCount = .init(followerUsersCount)
-            }
-            if let followingUserIDs = previewUserDetail.followingUserIDs {
-                userDetail.followingUserIDs = followingUserIDs
-            }
-            if let followingUsersCount = previewUserDetail.followingUsersCount {
-                userDetail.followingUsersCount = .init(followingUsersCount)
-            }
-            if let isProtected = previewUserDetail.isProtected {
-                userDetail.isProtected = isProtected
-            }
-            if let isVerified = previewUserDetail.isVerified {
-                userDetail.isVerified = isVerified
-            }
-            if let listedCount = previewUserDetail.listedCount {
-                userDetail.listedCount = .init(listedCount)
-            }
-            if let location = previewUserDetail.location {
-                userDetail.location = location
-            }
-            if let mutingUserIDs = previewUserDetail.mutingUserIDs {
-                userDetail.mutingUserIDs = mutingUserIDs
-            }
-            if let name = previewUserDetail.name {
-                userDetail.name = name
-            }
-            if let profileHeaderImageURL = previewUserDetail.profileHeaderImageURL {
-                userDetail.profileHeaderImageURL = profileHeaderImageURL
-            }
-            if let profileImageURL = previewUserDetail.profileImageURL {
-                userDetail.profileImageURL = profileImageURL
-            }
-            if let tweetsCount = previewUserDetail.tweetsCount {
-                userDetail.tweetsCount = .init(tweetsCount)
-            }
-            if let url = previewUserDetail.url {
-                userDetail.url = url
-            }
-            if let userAttributedDescription = previewUserDetail.userAttributedDescription {
-                userDetail.userAttributedDescription = .init(userAttributedDescription)
-            }
-            if let userCreationDate = previewUserDetail.userCreationDate {
-                userDetail.userCreationDate = userCreationDate
-            }
-            if let userID = previewUserDetail.userID {
-                userDetail.userID = userID
-            }
-            if let username = previewUserDetail.username {
-                userDetail.username = username
+            func assign<T>(_ value: T?, to dest: inout T) {
+                if let value = value {
+                    dest = value
+                }
             }
+            assign(previewUserDetail.blockingUserIDs, to: &userDetail.blockingUserIDs)
+            assign(previewUserDetail.creationDate ?? .now, to: &userDetail.creationDate)
+            assign(previewUserDetail.followerUserIDs, to: &userDetail.followerUserIDs)
+            assign(previewUserDetail.followerUsersCount.flatMap({.init($0)}), to: &userDetail.followerUsersCount)
+            assign(previewUserDetail.followingUserIDs, to: &userDetail.followingUserIDs)
+            assign(previewUserDetail.followingUsersCount.flatMap({.init($0)}), to: &userDetail.followingUsersCount)
+            assign(previewUserDetail.isProtected, to: &userDetail.isProtected)
+            assign(previewUserDetail.isVerified, to: &userDetail.isVerified)
+            assign(previewUserDetail.listedCount.flatMap({.init($0)}), to: &userDetail.listedCount)
+            assign(previewUserDetail.location, to: &userDetail.location)
+            assign(previewUserDetail.mutingUserIDs, to: &userDetail.mutingUserIDs)
+            assign(previewUserDetail.name, to: &userDetail.name)
+            assign(previewUserDetail.profileHeaderImageURL, to: &userDetail.profileHeaderImageURL)
+            assign(previewUserDetail.profileImageURL, to: &userDetail.profileImageURL)
+            assign(previewUserDetail.tweetsCount.flatMap({.init($0)}), to: &userDetail.tweetsCount)
+            assign(previewUserDetail.url, to: &userDetail.url)
+            assign(previewUserDetail.userAttributedDescription.flatMap({.init($0)}), to: &userDetail.userAttributedDescription)
+            assign(previewUserDetail.userCreationDate, to: &userDetail.userCreationDate)
+            assign(previewUserDetail.userID, to: &userDetail.userID)
+            assign(previewUserDetail.username, to: &userDetail.username)
             if save {
                 do {
                     try context.save()