fix(gql_code_builder): Fixing nullables and type overrides for vars create factories (#444)

Author: caffeineflo

codegen/end_to_end_test/lib/fragments/__generated__/fragment_with_scalar_var.var.gql.dart

@@ -2,9 +2,9 @@ name: gql_build
 version: 0.11.0+1
 description: Useful builders for your GraphQL SDL and documents. Based on package:gql_code_builder and package:build
 repository: https://github.com/gql-dart/gql
-environment:
+environment: 
   sdk: '>=3.0.0 <4.0.0'
-dependencies:
+dependencies: 
   analyzer: '>=4.6.0 <7.0.0'
   build: ^2.1.0
   built_collection: ^5.0.0
@@ -18,10 +18,10 @@ dependencies:
   path: ^1.8.0
   yaml: ^3.1.0
   gql_tristate_value: ^1.0.0
-dev_dependencies:
+dev_dependencies: 
   build_test: ^2.0.0
   gql_pedantic: ^1.0.2
-topics:
+topics: 
   - graphql
   - gql
   - codegen

codegen/end_to_end_test/lib/fragments/__generated__/hero_with_fragments.var.gql.dart

@@ -8,6 +8,7 @@ Constructor builtCreateConstructor({
   required String name,
   required Iterable<Method> getters,
   required SourceNode schemaSource,
+  Map<String, Reference> typeOverrides = const {},
 }) {
   final className = builtClassName(name);
 
@@ -21,25 +22,29 @@ Constructor builtCreateConstructor({
   );
 
   // Create parameters for the factory constructor
-  final factoryParameters = filteredGetters.map(
-    (g) => Parameter(
+  final factoryParameters = filteredGetters.map((g) {
+    final isNullable = (g.returns! as TypeReference).isNullable ?? false;
+
+    return Parameter(
       (b) => b
         ..name = g.name!
         ..named = true
-        ..required = true
+        ..required = !isNullable
         ..type = g.returns,
-    ),
-  );
+    );
+  });
 
   final assignments = filteredGetters.map((g) {
     final typeDefinitionNode = getTypeDefinitionNode(
         schemaSource.document, g.returns!.symbol!.replaceFirst("G", ""));
     final isBuiltType = typeDefinitionNode is InputObjectTypeDefinitionNode ||
         typeDefinitionNode is ScalarTypeDefinitionNode;
 
-    // Check if the type is nullable
+    final isTypeOverride = typeOverrides.values.contains(g.returns!);
     final isNullable = (g.returns! as TypeReference).isNullable ?? false;
-    final assignment = isBuiltType
+
+    // If the type is a built type and not a TypeOverride, we need to call toBuilder() on it.
+    final assignment = isBuiltType && !isTypeOverride
         ? "${g.name} = ${g.name}${isNullable ? '?' : ''}.toBuilder()"
         : "${g.name} = ${g.name}";
 

codegen/end_to_end_test/lib/fragments/__generated__/multiple_fragments.var.gql.dart

@@ -52,6 +52,7 @@ Library buildVarLibrary(
                     ),
                   ),
                   schemaSource: schemaSource,
+                  typeOverrides: typeOverrides,
                 ),
             ],
             initializers: switch (useTriStateValueForNullableTypes) {

codegen/end_to_end_test/lib/scalars/__generated__/review_with_date.var.gql.dart

@@ -2,9 +2,9 @@ name: gql_code_builder
 version: 0.10.0
 description: Dart code builders taking *.graphql documents and SDL to build useful classes.
 repository: https://github.com/gql-dart/gql
-environment:
+environment: 
   sdk: '>=3.0.0 <4.0.0'
-dependencies:
+dependencies: 
   analyzer: '>=4.6.0 <7.0.0'
   built_collection: ^5.0.0
   built_value: ^8.0.6
@@ -14,11 +14,11 @@ dependencies:
   gql_exec: ^1.0.0
   path: ^1.8.0
   gql_tristate_value: ^1.0.0
-dev_dependencies:
+dev_dependencies: 
   build_runner: ^2.1.0
   gql_pedantic: ^1.0.2
   test: ^1.16.8
-topics:
+topics: 
   - graphql
   - gql
   - codegen