fix: Adding back customType with deprecated message

Amplify.xcodeproj/project.pbxproj

@@ -111,6 +111,7 @@
 		21A3FDB62464590600E76120 /* ModelMultipleOwnerAuthRuleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 21A3FDB52464590600E76120 /* ModelMultipleOwnerAuthRuleTests.swift */; };
 		21A3FDB9246494CD00E76120 /* GraphQLRequestAuthRuleTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 21A3FDB8246494CD00E76120 /* GraphQLRequestAuthRuleTests.swift */; };
 		21A3FDBF2465FA1500E76120 /* AuthRule+Extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 21A3FDBE2465FA1500E76120 /* AuthRule+Extension.swift */; };
+		21AD4257249BFFE00016FE95 /* DeprecatedTodo.swift in Sources */ = {isa = PBXBuildFile; fileRef = 21AD4255249BFFDF0016FE95 /* DeprecatedTodo.swift */; };
 		21C395B3245729EC00597EA2 /* AppSyncErrorType.swift in Sources */ = {isa = PBXBuildFile; fileRef = 21C395B2245729EC00597EA2 /* AppSyncErrorType.swift */; };
 		21D79FDA237617C60057D00D /* SubscriptionEvent.swift in Sources */ = {isa = PBXBuildFile; fileRef = 21D79FD9237617C60057D00D /* SubscriptionEvent.swift */; };
 		21D79FE32377F4120057D00D /* SubscriptionConnectionState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 21D79FE22377F4120057D00D /* SubscriptionConnectionState.swift */; };
@@ -757,6 +758,7 @@
 		21A3FDB52464590600E76120 /* ModelMultipleOwnerAuthRuleTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ModelMultipleOwnerAuthRuleTests.swift; sourceTree = "<group>"; };
 		21A3FDB8246494CD00E76120 /* GraphQLRequestAuthRuleTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GraphQLRequestAuthRuleTests.swift; sourceTree = "<group>"; };
 		21A3FDBE2465FA1500E76120 /* AuthRule+Extension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "AuthRule+Extension.swift"; sourceTree = "<group>"; };
+		21AD4255249BFFDF0016FE95 /* DeprecatedTodo.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = DeprecatedTodo.swift; path = Deprecated/DeprecatedTodo.swift; sourceTree = "<group>"; };
 		21C395B2245729EC00597EA2 /* AppSyncErrorType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppSyncErrorType.swift; sourceTree = "<group>"; };
 		21D79FD9237617C60057D00D /* SubscriptionEvent.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SubscriptionEvent.swift; sourceTree = "<group>"; };
 		21D79FE22377F4120057D00D /* SubscriptionConnectionState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SubscriptionConnectionState.swift; sourceTree = "<group>"; };
@@ -2228,6 +2230,7 @@
 		B952182D237E21B900F53237 /* Models */ = {
 			isa = PBXGroup;
 			children = (
+				21AD4255249BFFDF0016FE95 /* DeprecatedTodo.swift */,
 				216E45E9248E91420035E3CE /* NonModel */,
 				FAF512AD23986791001ADF4E /* AmplifyModels.swift */,
 				214F49CB24898E8400DA616C /* Article.swift */,
@@ -4489,6 +4492,7 @@
 				21F40A4023A295470074678E /* TestCommonConstants.swift in Sources */,
 				214F497C2486D8A200DA616C /* UserFollowers.swift in Sources */,
 				B9521835237E21BA00F53237 /* Comment.swift in Sources */,
+				21AD4257249BFFE00016FE95 /* DeprecatedTodo.swift in Sources */,
 				216E45EF248E914F0035E3CE /* Todo+Schema.swift in Sources */,
 				FACA361E2327FC8E000E74F6 /* MockAnalyticsCategoryPlugin.swift in Sources */,
 				2129BE012394627B006363A1 /* PostCommentModelRegistration.swift in Sources */,

Amplify/Categories/DataStore/Model/Embedded.swift

@@ -12,7 +12,7 @@ import Foundation
 /// A `Embeddable` type can be used in a `Model` as an embedded type. All types embedded in a `Model` as an
 /// `embedded(type:)` or `embeddedCollection(of:)` must comform to the `Embeddable` protocol except for Swift's Basic
 /// types embedded as a collection. A collection of String can be embedded in the `Model` as
-/// `embeddedCollection(of: String.self)` without needing to conform to Embeddable. 
+/// `embeddedCollection(of: String.self)` without needing to conform to Embeddable.
 public protocol Embeddable: Codable {
 
     /// A reference to the `ModelSchema` associated with this embedded type.

Amplify/Categories/DataStore/Model/Schema/ModelSchema+Definition.swift

@@ -33,6 +33,14 @@ public enum ModelFieldType {
         }
     }
 
+    @available(*, deprecated, message: """
+        This has been replaced with `.embedded(type)` and `.embeddedCollection(of)` \
+        Please use Amplify CLI 4.21.4 or newer to re-generate your Models to conform to Embeddable type.
+    """)
+    public static func customType(_ type: Codable.Type) -> ModelFieldType {
+        return .embedded(type: type)
+    }
+
     public static func from(type: Any.Type) -> ModelFieldType {
         if type is String.Type {
             return .string

AmplifyTestCommon/Models/Deprecated/DeprecatedTodo.swift

@@ -0,0 +1,69 @@
+//
+// Copyright 2018-2020 Amazon.com,
+// Inc. or its affiliates. All Rights Reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+// swiftlint:disable all
+import Amplify
+import Foundation
+/*
+The schema used to codegen this model:
+ type DeprecatedTodo @model {
+   id: ID!
+   description: String
+   note: Note
+ }
+ type Note {
+   name: String!
+   color: String!
+ }
+
+ Amplify CLI version used is less than 4.21.4. `.customType` has since been replaced with `.embedded(type)` and
+ `.embeddedCollection(of)`. Please use Amplify CLI 4.21.4 or newer to re-generate your Models to conform to
+ Embeddable type.
+ */
+
+public struct DeprecatedTodo: Model {
+  public let id: String
+  public var description: String?
+  public var note: Note?
+
+  public init(id: String = UUID().uuidString,
+      description: String? = nil,
+      note: Note? = nil) {
+      self.id = id
+      self.description = description
+      self.note = note
+  }
+}
+
+extension DeprecatedTodo {
+  // MARK: - CodingKeys
+   public enum CodingKeys: String, ModelKey {
+    case id
+    case description
+    case note
+  }
+
+  public static let keys = CodingKeys.self
+  //  MARK: - ModelSchema
+
+  public static let schema = defineSchema { model in
+    let deprecatedTodo = DeprecatedTodo.keys
+
+    model.pluralName = "DeprecatedTodos"
+
+    model.fields(
+      .id(),
+      .field(deprecatedTodo.description, is: .optional, ofType: .string),
+      .field(deprecatedTodo.note, is: .optional, ofType: .customType(Note.self))
+    )
+    }
+}
+
+public struct Note: Codable {
+    var name: String
+    var color: String
+}