Feature/allow null with defaults

CHANGELOG.md

@@ -1,10 +1,16 @@
 # Changelog
+## [5.9.0] - 2022-03-29
+- *POTENTIALLY BREAKING CHANGE*: By default, fields with a default value will now accept 'null' to use their default value
+- Add options to control whether fields with default value accepts 'null' or not
+  - `disallow_null` on fields
+  - `disallow_null_for_defaults` on the root yml config or the object config
+
 ## [5.8.1] - 2021-12-09
 - Detect the current min dart version and use newer features when available. (Fixes #108)
 
 ## [5.8.0] - 2021-11-25
 - Added `retrofit_compute` option to generate top-level functions compatible with retrofit's compute mode. (Fixes #106)
-- 
+
 ## [5.7.1] - 2021-11-13
 - Fixed issue where default values would still throw missing key exceptions. (Fixes #103)
 

README.md

@@ -179,6 +179,52 @@ UserModel:
       default_value: "'an example quoted string'"
 ```
 
+### Default values and null
+
+Since version `5.9.0` fields with default values can accept null values in json. In which case the default value will be used instead.
+
+If you wish to control this behaviour, you can add `disallow_null_for_defaults: true` to either the `model_generator` config or the model property. Alternatively you can specify
+the behaviour per field by using `disallow_null`.
+
+Example:
+
+```yaml
+model_generator:
+  disallow_null_for_defaults: true
+```
+
+Example 2:
+
+```yaml
+UserModel:
+  path: webservice/user
+  disallow_null_for_defaults: true
+  properties:
+    id:
+      type: int
+      default_value: 1
+    name:
+      type: string
+      required: true
+      default_value: "'an example quoted string'"
+```
+
+Example 3:
+
+```yaml
+UserModel:
+  path: webservice/user
+  properties:
+    id:
+      type: int
+      default_value: 1
+    name:
+      type: string
+      required: true
+      default_value: "'an example quoted string'"
+      disallow_null: true
+```
+
 ## Generics support support
 
 If you want your models to generate code that can be used in combination with generics. use this:
@@ -202,9 +248,11 @@ UserModel:
 ```
 
 ## Extends
+
 If you want your models to expand any other model use extends:
 
 *Note: It is not supported to extend custom models*
+
 ```yaml
 UserDetails:
   path: webservice/user

example/.fvm/fvm_config.json

@@ -0,0 +1,4 @@
+{
+  "flutterSdkVersion": "2.10.3",
+  "flavors": {}
+}

lib/config/pubspec_config.dart

@@ -21,6 +21,7 @@ class PubspecConfig {
   late bool staticCreate;
   late bool uppercaseEnums;
   late bool retrofitMappers;
+  late bool disallowNullForDefaults;
   LanguageVersion? languageVersion;
   final extraImports = <String>[];
   final extraAnnotations = <String>[];
@@ -51,6 +52,7 @@ class PubspecConfig {
       staticCreate = false;
       uppercaseEnums = true;
       retrofitMappers = false;
+      disallowNullForDefaults = false;
       return;
     }
 
@@ -64,6 +66,8 @@ class PubspecConfig {
     staticCreate = (config['static_create'] ?? false) == true;
     uppercaseEnums = (config['uppercase_enums'] ?? true) == true;
     retrofitMappers = (config['retrofit_compute'] ?? false) == true;
+    disallowNullForDefaults =
+        (config['disallow_null_for_defaults'] ?? false) == true;
 
     final extraImports = config['extra_imports'];
     if (extraImports != null) {

lib/config/yml_generator_config.dart

@@ -122,12 +122,17 @@ class YmlGeneratorConfig {
         ));
       } else {
         final staticCreate = (value['static_create'] ?? false) == true;
+        final disallowNullForDefaults =
+            value.containsKey('disallow_null_for_defaults')
+                ? (value['disallow_null_for_defaults'] == true)
+                : pubspecConfig.disallowNullForDefaults;
         final fields = <Field>[];
         properties.forEach((propertyKey, propertyValue) {
           if (propertyValue is! YamlMap) {
             throw Exception('$propertyKey should be an object');
           }
-          fields.add(getField(propertyKey, propertyValue));
+          fields.add(getField(propertyKey, propertyValue,
+              disallowNullForDefaults: disallowNullForDefaults));
         });
         final mappedConverters =
             converters?.map((element) => element.toString()).toList();
@@ -146,14 +151,16 @@ class YmlGeneratorConfig {
           explicitToJson: value['explicit_to_json'],
           generateToString: value['to_string'],
           description: description,
+          disallowNullForDefaults: disallowNullForDefaults,
         ));
       }
     });
 
     checkIfTypesAvailable();
   }
 
-  Field getField(String name, YamlMap property) {
+  Field getField(String name, YamlMap property,
+      {required bool disallowNullForDefaults}) {
     try {
       final required =
           property.containsKey('required') && property['required'] == true;
@@ -172,7 +179,10 @@ class YmlGeneratorConfig {
           : null;
       final type = property['type'];
       final skipEquality = property['ignore_equality'] == true;
-      var defaultValue = property['default_value']?.toString();
+      final defaultValue = property['default_value']?.toString();
+      final disallowNull = property.containsKey('disallow_null')
+          ? (property['disallow_null'] == true)
+          : disallowNullForDefaults;
       ItemType itemType;
 
       if (type == null) {
@@ -219,6 +229,7 @@ class YmlGeneratorConfig {
         toJson: toJson,
         ignoreEquality: skipEquality,
         defaultValue: defaultValue,
+        disallowNull: disallowNull,
       );
     } catch (e) {
       print('Something went wrong with $name:\n\n${e.toString()}');

lib/model/field.dart

@@ -16,6 +16,7 @@ class Field {
   final String? toJson;
   final bool ignoreEquality;
   final String? defaultValue;
+  final bool disallowNull;
 
   bool get hasDefaultValue => defaultValue != null;
 
@@ -32,6 +33,7 @@ class Field {
     this.fromJson,
     this.toJson,
     this.defaultValue,
+    this.disallowNull = false,
     String? jsonKey,
   })  : serializedName = jsonKey ?? name,
         name =

lib/model/model/object_model.dart

@@ -9,6 +9,7 @@ class ObjectModel extends Model {
   final bool? explicitToJson;
   final bool? generateToString;
   final bool? staticCreate;
+  final bool? disallowNullForDefaults;
 
   ObjectModel({
     required String name,
@@ -24,6 +25,7 @@ class ObjectModel extends Model {
     this.explicitToJson,
     this.generateToString,
     this.staticCreate,
+    this.disallowNullForDefaults,
     String? description,
   }) : super(
           name: name,

lib/writer/object_model_writer.dart

@@ -100,7 +100,7 @@ class ObjectModelWriter {
       sb.write("  @JsonKey(name: '${key.serializedName}'");
       if (key.isRequired) {
         if (key.hasDefaultValue) {
-          sb.write(', required: false, disallowNullValue: true');
+          sb.write(', required: false, disallowNullValue: ${key.disallowNull}');
         } else {
           sb.write(', required: true');
         }

pubspec.yaml

@@ -1,6 +1,6 @@
 name: model_generator
 description: Dart tool to automaticly generate models from a yml file to speed up your development flow.
-version: 5.8.1
+version: 5.9.0
 homepage: https://github.com/icapps/flutter-model-generator
 
 environment:

test/writer/object_model_writer/default-field-required-null-disallowed/config.txt

@@ -0,0 +1,10 @@
+Person:
+  path: user/person/
+  type: object
+  properties:
+    firstName:
+      description: A good description
+      type: string
+      required: true
+      default_field: "'test'"
+      disallow_null: true

test/writer/object_model_writer/default-field-required-null-disallowed/output.txt

@@ -0,0 +1,19 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'person.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class Person {
+  ///A good description
+  @JsonKey(name: 'firstName', required: false, disallowNullValue: true)
+  final String firstName;
+
+  const Person({
+    this.firstName = 'test',
+  });
+
+  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json);
+
+  Map<String, dynamic> toJson() => _$PersonToJson(this);
+
+}

test/writer/object_model_writer/default-field-required-null-disallowed/pubspec.txt

@@ -0,0 +1,4 @@
+name: model_generator_example
+
+model_generator:
+  config_path: model_generator/config.yaml

test/writer/object_model_writer/default-field-required/output.txt

@@ -5,7 +5,7 @@ part 'person.g.dart';
 @JsonSerializable(explicitToJson: true)
 class Person {
   ///A good description
-  @JsonKey(name: 'firstName', required: false, disallowNullValue: true)
+  @JsonKey(name: 'firstName', required: false, disallowNullValue: false)
   final String firstName;
 
   const Person({

test/writer/object_model_writer_test.dart

@@ -998,6 +998,32 @@ void main() {
       WriterTestHelper.testObjectModelWriter(
           model, [], 'default-field-required');
     });
+    test('Normal ObjectModelWriter with default required field disallow null',
+        () {
+      final model = ObjectModel(
+        name: 'Person',
+        path: 'path_to_my_model',
+        baseDirectory: 'base_dir',
+        generateForGenerics: false,
+        staticCreate: false,
+        fields: [
+          Field(
+              name: 'firstName',
+              type: StringType(),
+              isRequired: true,
+              ignore: false,
+              includeIfNull: true,
+              ignoreEquality: false,
+              nonFinal: false,
+              disallowNull: true,
+              defaultValue: '\'test\'',
+              description: 'A good description'),
+        ],
+        converters: [],
+      );
+      WriterTestHelper.testObjectModelWriter(
+          model, [], 'default-field-required-null-disallowed');
+    });
     test('Normal ObjectModelWriter with retrofit compute', () {
       final model = ObjectModel(
         name: 'Person',