diff --git a/angel_orm_generator/test/models/author.g.dart b/angel_orm_generator/test/models/author.g.dart
index 5834d0d5..7f83df61 100644
--- a/angel_orm_generator/test/models/author.g.dart
+++ b/angel_orm_generator/test/models/author.g.dart
@@ -189,10 +189,6 @@ class Author extends _Author {
 
 abstract class AuthorSerializer {
   static Author fromMap(Map map) {
-    if (map['name'] == null) {
-      throw new FormatException("Missing required field 'name' on Author.");
-    }
-
     return new Author(
         id: map['id'] as String,
         name: map['name'] as String ?? 'Tobe Osakwe',
@@ -212,10 +208,6 @@ abstract class AuthorSerializer {
     if (model == null) {
       return null;
     }
-    if (model.name == null) {
-      throw new FormatException("Missing required field 'name' on Author.");
-    }
-
     return {
       'id': model.id,
       'name': model.name,
diff --git a/angel_orm_generator/test/models/book.g.dart b/angel_orm_generator/test/models/book.g.dart
index ebabf7b0..cbf349ed 100644
--- a/angel_orm_generator/test/models/book.g.dart
+++ b/angel_orm_generator/test/models/book.g.dart
@@ -188,9 +188,9 @@ class BookQueryValues extends MapQueryValues {
 class Book extends _Book {
   Book(
       {this.id,
-      @required this.author,
-      @required this.partnerAuthor,
-      @required this.name,
+      this.author,
+      this.partnerAuthor,
+      this.name,
       this.createdAt,
       this.updatedAt});
 
@@ -254,19 +254,6 @@ class Book extends _Book {
 
 abstract class BookSerializer {
   static Book fromMap(Map map) {
-    if (map['author'] == null) {
-      throw new FormatException("Missing required field 'author' on Book.");
-    }
-
-    if (map['partner_author'] == null) {
-      throw new FormatException(
-          "Missing required field 'partner_author' on Book.");
-    }
-
-    if (map['name'] == null) {
-      throw new FormatException("Missing required field 'name' on Book.");
-    }
-
     return new Book(
         id: map['id'] as String,
         author: map['author'] != null
@@ -292,19 +279,6 @@ abstract class BookSerializer {
     if (model == null) {
       return null;
     }
-    if (model.author == null) {
-      throw new FormatException("Missing required field 'author' on Book.");
-    }
-
-    if (model.partnerAuthor == null) {
-      throw new FormatException(
-          "Missing required field 'partner_author' on Book.");
-    }
-
-    if (model.name == null) {
-      throw new FormatException("Missing required field 'name' on Book.");
-    }
-
     return {
       'id': model.id,
       'author': AuthorSerializer.toMap(model.author),
diff --git a/angel_orm_generator/test/models/car.g.dart b/angel_orm_generator/test/models/car.g.dart
index 58171721..945402ad 100644
--- a/angel_orm_generator/test/models/car.g.dart
+++ b/angel_orm_generator/test/models/car.g.dart
@@ -191,10 +191,10 @@ class CarQueryValues extends MapQueryValues {
 class Car extends _Car {
   Car(
       {this.id,
-      @required this.make,
-      @required this.description,
-      @required this.familyFriendly,
-      @required this.recalledAt,
+      this.make,
+      this.description,
+      this.familyFriendly,
+      this.recalledAt,
       this.createdAt,
       this.updatedAt});
 
@@ -272,23 +272,6 @@ class Car extends _Car {
 
 abstract class CarSerializer {
   static Car fromMap(Map map) {
-    if (map['make'] == null) {
-      throw new FormatException("Missing required field 'make' on Car.");
-    }
-
-    if (map['description'] == null) {
-      throw new FormatException("Missing required field 'description' on Car.");
-    }
-
-    if (map['family_friendly'] == null) {
-      throw new FormatException(
-          "Missing required field 'family_friendly' on Car.");
-    }
-
-    if (map['recalled_at'] == null) {
-      throw new FormatException("Missing required field 'recalled_at' on Car.");
-    }
-
     return new Car(
         id: map['id'] as String,
         make: map['make'] as String,
@@ -315,23 +298,6 @@ abstract class CarSerializer {
     if (model == null) {
       return null;
     }
-    if (model.make == null) {
-      throw new FormatException("Missing required field 'make' on Car.");
-    }
-
-    if (model.description == null) {
-      throw new FormatException("Missing required field 'description' on Car.");
-    }
-
-    if (model.familyFriendly == null) {
-      throw new FormatException(
-          "Missing required field 'family_friendly' on Car.");
-    }
-
-    if (model.recalledAt == null) {
-      throw new FormatException("Missing required field 'recalled_at' on Car.");
-    }
-
     return {
       'id': model.id,
       'make': model.make,
diff --git a/angel_orm_generator/test/models/foot.g.dart b/angel_orm_generator/test/models/foot.g.dart
index 3216124f..c23b674b 100644
--- a/angel_orm_generator/test/models/foot.g.dart
+++ b/angel_orm_generator/test/models/foot.g.dart
@@ -151,12 +151,7 @@ class FootQueryValues extends MapQueryValues {
 
 @generatedSerializable
 class Foot extends _Foot {
-  Foot(
-      {this.id,
-      @required this.legId,
-      @required this.nToes,
-      this.createdAt,
-      this.updatedAt});
+  Foot({this.id, this.legId, this.nToes, this.createdAt, this.updatedAt});
 
   @override
   final String id;
@@ -212,14 +207,6 @@ class Foot extends _Foot {
 
 abstract class FootSerializer {
   static Foot fromMap(Map map) {
-    if (map['leg_id'] == null) {
-      throw new FormatException("Missing required field 'leg_id' on Foot.");
-    }
-
-    if (map['n_toes'] == null) {
-      throw new FormatException("Missing required field 'n_toes' on Foot.");
-    }
-
     return new Foot(
         id: map['id'] as String,
         legId: map['leg_id'] as int,
@@ -240,14 +227,6 @@ abstract class FootSerializer {
     if (model == null) {
       return null;
     }
-    if (model.legId == null) {
-      throw new FormatException("Missing required field 'leg_id' on Foot.");
-    }
-
-    if (model.nToes == null) {
-      throw new FormatException("Missing required field 'n_toes' on Foot.");
-    }
-
     return {
       'id': model.id,
       'leg_id': model.legId,
diff --git a/angel_orm_generator/test/models/fruit.g.dart b/angel_orm_generator/test/models/fruit.g.dart
index 754501be..cb34d70a 100644
--- a/angel_orm_generator/test/models/fruit.g.dart
+++ b/angel_orm_generator/test/models/fruit.g.dart
@@ -152,11 +152,7 @@ class FruitQueryValues extends MapQueryValues {
 @generatedSerializable
 class Fruit extends _Fruit {
   Fruit(
-      {this.id,
-      @required this.treeId,
-      @required this.commonName,
-      this.createdAt,
-      this.updatedAt});
+      {this.id, this.treeId, this.commonName, this.createdAt, this.updatedAt});
 
   @override
   final String id;
@@ -212,15 +208,6 @@ class Fruit extends _Fruit {
 
 abstract class FruitSerializer {
   static Fruit fromMap(Map map) {
-    if (map['tree_id'] == null) {
-      throw new FormatException("Missing required field 'tree_id' on Fruit.");
-    }
-
-    if (map['common_name'] == null) {
-      throw new FormatException(
-          "Missing required field 'common_name' on Fruit.");
-    }
-
     return new Fruit(
         id: map['id'] as String,
         treeId: map['tree_id'] as int,
@@ -241,15 +228,6 @@ abstract class FruitSerializer {
     if (model == null) {
       return null;
     }
-    if (model.treeId == null) {
-      throw new FormatException("Missing required field 'tree_id' on Fruit.");
-    }
-
-    if (model.commonName == null) {
-      throw new FormatException(
-          "Missing required field 'common_name' on Fruit.");
-    }
-
     return {
       'id': model.id,
       'tree_id': model.treeId,
diff --git a/angel_orm_generator/test/models/has_map.g.dart b/angel_orm_generator/test/models/has_map.g.dart
index 49a53c50..0a662e5d 100644
--- a/angel_orm_generator/test/models/has_map.g.dart
+++ b/angel_orm_generator/test/models/has_map.g.dart
@@ -119,9 +119,7 @@ class HasMapQueryValues extends MapQueryValues {
 
 @generatedSerializable
 class HasMap implements _HasMap {
-  const HasMap(
-      {@required Map<dynamic, dynamic> this.value,
-      @required List<dynamic> this.list});
+  const HasMap({Map<dynamic, dynamic> this.value, List<dynamic> this.list});
 
   @override
   final Map<dynamic, dynamic> value;
@@ -158,14 +156,6 @@ class HasMap implements _HasMap {
 
 abstract class HasMapSerializer {
   static HasMap fromMap(Map map) {
-    if (map['value'] == null) {
-      throw new FormatException("Missing required field 'value' on HasMap.");
-    }
-
-    if (map['list'] == null) {
-      throw new FormatException("Missing required field 'list' on HasMap.");
-    }
-
     return new HasMap(
         value: map['value'] is Map
             ? (map['value'] as Map).cast<dynamic, dynamic>()
@@ -179,14 +169,6 @@ abstract class HasMapSerializer {
     if (model == null) {
       return null;
     }
-    if (model.value == null) {
-      throw new FormatException("Missing required field 'value' on HasMap.");
-    }
-
-    if (model.list == null) {
-      throw new FormatException("Missing required field 'list' on HasMap.");
-    }
-
     return {'value': model.value, 'list': model.list};
   }
 }
diff --git a/angel_orm_generator/test/models/leg.g.dart b/angel_orm_generator/test/models/leg.g.dart
index b874312c..243bcbfb 100644
--- a/angel_orm_generator/test/models/leg.g.dart
+++ b/angel_orm_generator/test/models/leg.g.dart
@@ -152,12 +152,7 @@ class LegQueryValues extends MapQueryValues {
 
 @generatedSerializable
 class Leg extends _Leg {
-  Leg(
-      {this.id,
-      @required this.foot,
-      @required this.name,
-      this.createdAt,
-      this.updatedAt});
+  Leg({this.id, this.foot, this.name, this.createdAt, this.updatedAt});
 
   @override
   final String id;
@@ -213,14 +208,6 @@ class Leg extends _Leg {
 
 abstract class LegSerializer {
   static Leg fromMap(Map map) {
-    if (map['foot'] == null) {
-      throw new FormatException("Missing required field 'foot' on Leg.");
-    }
-
-    if (map['name'] == null) {
-      throw new FormatException("Missing required field 'name' on Leg.");
-    }
-
     return new Leg(
         id: map['id'] as String,
         foot: map['foot'] != null
@@ -243,14 +230,6 @@ abstract class LegSerializer {
     if (model == null) {
       return null;
     }
-    if (model.foot == null) {
-      throw new FormatException("Missing required field 'foot' on Leg.");
-    }
-
-    if (model.name == null) {
-      throw new FormatException("Missing required field 'name' on Leg.");
-    }
-
     return {
       'id': model.id,
       'foot': FootSerializer.toMap(model.foot),
diff --git a/angel_orm_generator/test/models/order.g.dart b/angel_orm_generator/test/models/order.g.dart
index 635ff568..170eaf5a 100644
--- a/angel_orm_generator/test/models/order.g.dart
+++ b/angel_orm_generator/test/models/order.g.dart
@@ -199,10 +199,10 @@ class OrderQueryValues extends MapQueryValues {
 class Order extends _Order {
   Order(
       {this.id,
-      @required this.customer,
-      @required this.employeeId,
-      @required this.orderDate,
-      @required this.shipperId,
+      this.customer,
+      this.employeeId,
+      this.orderDate,
+      this.shipperId,
       this.createdAt,
       this.updatedAt});
 
@@ -273,25 +273,6 @@ class Order extends _Order {
 
 abstract class OrderSerializer {
   static Order fromMap(Map map) {
-    if (map['customer'] == null) {
-      throw new FormatException("Missing required field 'customer' on Order.");
-    }
-
-    if (map['employee_id'] == null) {
-      throw new FormatException(
-          "Missing required field 'employee_id' on Order.");
-    }
-
-    if (map['order_date'] == null) {
-      throw new FormatException(
-          "Missing required field 'order_date' on Order.");
-    }
-
-    if (map['shipper_id'] == null) {
-      throw new FormatException(
-          "Missing required field 'shipper_id' on Order.");
-    }
-
     return new Order(
         id: map['id'] as String,
         customer: map['customer'] != null
@@ -320,25 +301,6 @@ abstract class OrderSerializer {
     if (model == null) {
       return null;
     }
-    if (model.customer == null) {
-      throw new FormatException("Missing required field 'customer' on Order.");
-    }
-
-    if (model.employeeId == null) {
-      throw new FormatException(
-          "Missing required field 'employee_id' on Order.");
-    }
-
-    if (model.orderDate == null) {
-      throw new FormatException(
-          "Missing required field 'order_date' on Order.");
-    }
-
-    if (model.shipperId == null) {
-      throw new FormatException(
-          "Missing required field 'shipper_id' on Order.");
-    }
-
     return {
       'id': model.id,
       'customer': CustomerSerializer.toMap(model.customer),
diff --git a/angel_orm_generator/test/models/tree.g.dart b/angel_orm_generator/test/models/tree.g.dart
index 7f980a9c..bfb22e0a 100644
--- a/angel_orm_generator/test/models/tree.g.dart
+++ b/angel_orm_generator/test/models/tree.g.dart
@@ -213,11 +213,7 @@ class TreeQueryValues extends MapQueryValues {
 @generatedSerializable
 class Tree extends _Tree {
   Tree(
-      {this.id,
-      @required this.rings,
-      @required List<Fruit> fruits,
-      this.createdAt,
-      this.updatedAt})
+      {this.id, this.rings, List<Fruit> fruits, this.createdAt, this.updatedAt})
       : this.fruits = new List.unmodifiable(fruits ?? []);
 
   @override
@@ -275,14 +271,6 @@ class Tree extends _Tree {
 
 abstract class TreeSerializer {
   static Tree fromMap(Map map) {
-    if (map['rings'] == null) {
-      throw new FormatException("Missing required field 'rings' on Tree.");
-    }
-
-    if (map['fruits'] == null) {
-      throw new FormatException("Missing required field 'fruits' on Tree.");
-    }
-
     return new Tree(
         id: map['id'] as String,
         rings: map['rings'] as int,
@@ -308,14 +296,6 @@ abstract class TreeSerializer {
     if (model == null) {
       return null;
     }
-    if (model.rings == null) {
-      throw new FormatException("Missing required field 'rings' on Tree.");
-    }
-
-    if (model.fruits == null) {
-      throw new FormatException("Missing required field 'fruits' on Tree.");
-    }
-
     return {
       'id': model.id,
       'rings': model.rings,
diff --git a/angel_orm_generator/test/models/unorthodox.g.dart b/angel_orm_generator/test/models/unorthodox.g.dart
index e39d9cc4..6a19d955 100644
--- a/angel_orm_generator/test/models/unorthodox.g.dart
+++ b/angel_orm_generator/test/models/unorthodox.g.dart
@@ -821,7 +821,7 @@ class FooPivotQueryValues extends MapQueryValues {
 
 @generatedSerializable
 class Unorthodox implements _Unorthodox {
-  const Unorthodox({@required this.name});
+  const Unorthodox({this.name});
 
   @override
   final String name;
@@ -847,11 +847,11 @@ class Unorthodox implements _Unorthodox {
 @generatedSerializable
 class WeirdJoin implements _WeirdJoin {
   const WeirdJoin(
-      {@required this.id,
-      @required this.unorthodox,
-      @required this.song,
-      @required List<_Numba> this.numbas,
-      @required List<_Foo> this.foos});
+      {this.id,
+      this.unorthodox,
+      this.song,
+      List<_Numba> this.numbas,
+      List<_Foo> this.foos});
 
   @override
   final int id;
@@ -905,12 +905,7 @@ class WeirdJoin implements _WeirdJoin {
 
 @generatedSerializable
 class Song extends _Song {
-  Song(
-      {this.id,
-      @required this.weirdJoinId,
-      @required this.title,
-      this.createdAt,
-      this.updatedAt});
+  Song({this.id, this.weirdJoinId, this.title, this.createdAt, this.updatedAt});
 
   @override
   final String id;
@@ -962,7 +957,7 @@ class Song extends _Song {
 
 @generatedSerializable
 class Numba extends _Numba {
-  Numba({@required this.i, @required this.parent});
+  Numba({this.i, this.parent});
 
   @override
   final int i;
@@ -990,7 +985,7 @@ class Numba extends _Numba {
 
 @generatedSerializable
 class Foo implements _Foo {
-  const Foo({@required this.bar, @required List<_WeirdJoin> this.weirdJoins});
+  const Foo({this.bar, List<_WeirdJoin> this.weirdJoins});
 
   @override
   final String bar;
@@ -1022,7 +1017,7 @@ class Foo implements _Foo {
 
 @generatedSerializable
 class FooPivot implements _FooPivot {
-  const FooPivot({@required this.weirdJoin, @required this.foo});
+  const FooPivot({this.weirdJoin, this.foo});
 
   @override
   final _WeirdJoin weirdJoin;
@@ -1057,10 +1052,6 @@ class FooPivot implements _FooPivot {
 
 abstract class UnorthodoxSerializer {
   static Unorthodox fromMap(Map map) {
-    if (map['name'] == null) {
-      throw new FormatException("Missing required field 'name' on Unorthodox.");
-    }
-
     return new Unorthodox(name: map['name'] as String);
   }
 
@@ -1068,10 +1059,6 @@ abstract class UnorthodoxSerializer {
     if (model == null) {
       return null;
     }
-    if (model.name == null) {
-      throw new FormatException("Missing required field 'name' on Unorthodox.");
-    }
-
     return {'name': model.name};
   }
 }
@@ -1084,28 +1071,6 @@ abstract class UnorthodoxFields {
 
 abstract class WeirdJoinSerializer {
   static WeirdJoin fromMap(Map map) {
-    if (map['id'] == null) {
-      throw new FormatException("Missing required field 'id' on WeirdJoin.");
-    }
-
-    if (map['unorthodox'] == null) {
-      throw new FormatException(
-          "Missing required field 'unorthodox' on WeirdJoin.");
-    }
-
-    if (map['song'] == null) {
-      throw new FormatException("Missing required field 'song' on WeirdJoin.");
-    }
-
-    if (map['numbas'] == null) {
-      throw new FormatException(
-          "Missing required field 'numbas' on WeirdJoin.");
-    }
-
-    if (map['foos'] == null) {
-      throw new FormatException("Missing required field 'foos' on WeirdJoin.");
-    }
-
     return new WeirdJoin(
         id: map['id'] as int,
         unorthodox: map['unorthodox'] != null
@@ -1132,28 +1097,6 @@ abstract class WeirdJoinSerializer {
     if (model == null) {
       return null;
     }
-    if (model.id == null) {
-      throw new FormatException("Missing required field 'id' on WeirdJoin.");
-    }
-
-    if (model.unorthodox == null) {
-      throw new FormatException(
-          "Missing required field 'unorthodox' on WeirdJoin.");
-    }
-
-    if (model.song == null) {
-      throw new FormatException("Missing required field 'song' on WeirdJoin.");
-    }
-
-    if (model.numbas == null) {
-      throw new FormatException(
-          "Missing required field 'numbas' on WeirdJoin.");
-    }
-
-    if (model.foos == null) {
-      throw new FormatException("Missing required field 'foos' on WeirdJoin.");
-    }
-
     return {
       'id': model.id,
       'unorthodox': UnorthodoxSerializer.toMap(model.unorthodox),
@@ -1186,15 +1129,6 @@ abstract class WeirdJoinFields {
 
 abstract class SongSerializer {
   static Song fromMap(Map map) {
-    if (map['weird_join_id'] == null) {
-      throw new FormatException(
-          "Missing required field 'weird_join_id' on Song.");
-    }
-
-    if (map['title'] == null) {
-      throw new FormatException("Missing required field 'title' on Song.");
-    }
-
     return new Song(
         id: map['id'] as String,
         weirdJoinId: map['weird_join_id'] as int,
@@ -1215,15 +1149,6 @@ abstract class SongSerializer {
     if (model == null) {
       return null;
     }
-    if (model.weirdJoinId == null) {
-      throw new FormatException(
-          "Missing required field 'weird_join_id' on Song.");
-    }
-
-    if (model.title == null) {
-      throw new FormatException("Missing required field 'title' on Song.");
-    }
-
     return {
       'id': model.id,
       'weird_join_id': model.weirdJoinId,
@@ -1256,14 +1181,6 @@ abstract class SongFields {
 
 abstract class NumbaSerializer {
   static Numba fromMap(Map map) {
-    if (map['i'] == null) {
-      throw new FormatException("Missing required field 'i' on Numba.");
-    }
-
-    if (map['parent'] == null) {
-      throw new FormatException("Missing required field 'parent' on Numba.");
-    }
-
     return new Numba(i: map['i'] as int, parent: map['parent'] as int);
   }
 
@@ -1271,14 +1188,6 @@ abstract class NumbaSerializer {
     if (model == null) {
       return null;
     }
-    if (model.i == null) {
-      throw new FormatException("Missing required field 'i' on Numba.");
-    }
-
-    if (model.parent == null) {
-      throw new FormatException("Missing required field 'parent' on Numba.");
-    }
-
     return {'i': model.i, 'parent': model.parent};
   }
 }
@@ -1293,14 +1202,6 @@ abstract class NumbaFields {
 
 abstract class FooSerializer {
   static Foo fromMap(Map map) {
-    if (map['bar'] == null) {
-      throw new FormatException("Missing required field 'bar' on Foo.");
-    }
-
-    if (map['weird_joins'] == null) {
-      throw new FormatException("Missing required field 'weird_joins' on Foo.");
-    }
-
     return new Foo(
         bar: map['bar'] as String,
         weirdJoins: map['weird_joins'] is Iterable
@@ -1315,14 +1216,6 @@ abstract class FooSerializer {
     if (model == null) {
       return null;
     }
-    if (model.bar == null) {
-      throw new FormatException("Missing required field 'bar' on Foo.");
-    }
-
-    if (model.weirdJoins == null) {
-      throw new FormatException("Missing required field 'weird_joins' on Foo.");
-    }
-
     return {
       'bar': model.bar,
       'weird_joins':
@@ -1341,15 +1234,6 @@ abstract class FooFields {
 
 abstract class FooPivotSerializer {
   static FooPivot fromMap(Map map) {
-    if (map['weird_join'] == null) {
-      throw new FormatException(
-          "Missing required field 'weird_join' on FooPivot.");
-    }
-
-    if (map['foo'] == null) {
-      throw new FormatException("Missing required field 'foo' on FooPivot.");
-    }
-
     return new FooPivot(
         weirdJoin: map['weird_join'] != null
             ? WeirdJoinSerializer.fromMap(map['weird_join'] as Map)
@@ -1363,15 +1247,6 @@ abstract class FooPivotSerializer {
     if (model == null) {
       return null;
     }
-    if (model.weirdJoin == null) {
-      throw new FormatException(
-          "Missing required field 'weird_join' on FooPivot.");
-    }
-
-    if (model.foo == null) {
-      throw new FormatException("Missing required field 'foo' on FooPivot.");
-    }
-
     return {
       'weird_join': WeirdJoinSerializer.toMap(model.weirdJoin),
       'foo': FooSerializer.toMap(model.foo)
diff --git a/angel_orm_generator/test/models/user.g.dart b/angel_orm_generator/test/models/user.g.dart
index 09637f0d..0cf4a651 100644
--- a/angel_orm_generator/test/models/user.g.dart
+++ b/angel_orm_generator/test/models/user.g.dart
@@ -570,10 +570,10 @@ class RoleQueryValues extends MapQueryValues {
 class User extends _User {
   User(
       {this.id,
-      @required this.username,
-      @required this.password,
-      @required this.email,
-      @required List<_Role> roles,
+      this.username,
+      this.password,
+      this.email,
+      List<_Role> roles,
       this.createdAt,
       this.updatedAt})
       : this.roles = new List.unmodifiable(roles ?? []);
@@ -642,7 +642,7 @@ class User extends _User {
 
 @generatedSerializable
 class RoleUser implements _RoleUser {
-  const RoleUser({@required this.role, @required this.user});
+  const RoleUser({this.role, this.user});
 
   @override
   final _Role role;
@@ -670,12 +670,7 @@ class RoleUser implements _RoleUser {
 
 @generatedSerializable
 class Role extends _Role {
-  Role(
-      {this.id,
-      @required this.name,
-      @required List<_User> users,
-      this.createdAt,
-      this.updatedAt})
+  Role({this.id, this.name, List<_User> users, this.createdAt, this.updatedAt})
       : this.users = new List.unmodifiable(users ?? []);
 
   @override
@@ -733,22 +728,6 @@ class Role extends _Role {
 
 abstract class UserSerializer {
   static User fromMap(Map map) {
-    if (map['username'] == null) {
-      throw new FormatException("Missing required field 'username' on User.");
-    }
-
-    if (map['password'] == null) {
-      throw new FormatException("Missing required field 'password' on User.");
-    }
-
-    if (map['email'] == null) {
-      throw new FormatException("Missing required field 'email' on User.");
-    }
-
-    if (map['roles'] == null) {
-      throw new FormatException("Missing required field 'roles' on User.");
-    }
-
     return new User(
         id: map['id'] as String,
         username: map['username'] as String,
@@ -776,22 +755,6 @@ abstract class UserSerializer {
     if (model == null) {
       return null;
     }
-    if (model.username == null) {
-      throw new FormatException("Missing required field 'username' on User.");
-    }
-
-    if (model.password == null) {
-      throw new FormatException("Missing required field 'password' on User.");
-    }
-
-    if (model.email == null) {
-      throw new FormatException("Missing required field 'email' on User.");
-    }
-
-    if (model.roles == null) {
-      throw new FormatException("Missing required field 'roles' on User.");
-    }
-
     return {
       'id': model.id,
       'username': model.username,
@@ -832,14 +795,6 @@ abstract class UserFields {
 
 abstract class RoleUserSerializer {
   static RoleUser fromMap(Map map) {
-    if (map['role'] == null) {
-      throw new FormatException("Missing required field 'role' on RoleUser.");
-    }
-
-    if (map['user'] == null) {
-      throw new FormatException("Missing required field 'user' on RoleUser.");
-    }
-
     return new RoleUser(
         role: map['role'] != null
             ? RoleSerializer.fromMap(map['role'] as Map)
@@ -853,14 +808,6 @@ abstract class RoleUserSerializer {
     if (model == null) {
       return null;
     }
-    if (model.role == null) {
-      throw new FormatException("Missing required field 'role' on RoleUser.");
-    }
-
-    if (model.user == null) {
-      throw new FormatException("Missing required field 'user' on RoleUser.");
-    }
-
     return {
       'role': RoleSerializer.toMap(model.role),
       'user': UserSerializer.toMap(model.user)
@@ -878,14 +825,6 @@ abstract class RoleUserFields {
 
 abstract class RoleSerializer {
   static Role fromMap(Map map) {
-    if (map['name'] == null) {
-      throw new FormatException("Missing required field 'name' on Role.");
-    }
-
-    if (map['users'] == null) {
-      throw new FormatException("Missing required field 'users' on Role.");
-    }
-
     return new Role(
         id: map['id'] as String,
         name: map['name'] as String,
@@ -911,14 +850,6 @@ abstract class RoleSerializer {
     if (model == null) {
       return null;
     }
-    if (model.name == null) {
-      throw new FormatException("Missing required field 'name' on Role.");
-    }
-
-    if (model.users == null) {
-      throw new FormatException("Missing required field 'users' on Role.");
-    }
-
     return {
       'id': model.id,
       'name': model.name,