diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 00000000..8532f661
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,34 @@
+name: Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      # Install Node.js
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 18
+
+      # Install Dart SDK
+      - uses: dart-lang/setup-dart@v1
+        with:
+          sdk: stable
+
+      - name: Install dependencies
+        run: dart pub get && npm install
+
+      - name: Generate test client & create test db
+        run: npx prisma db push --schema test/schema.prisma --accept-data-loss --force-reset
+
+      - name: Analyze
+        run: dart analyze
+      - name: Test
+        run: dart test
diff --git a/bin/src/generate_output.dart b/bin/src/generate_output.dart
index 15416400..69495bd2 100644
--- a/bin/src/generate_output.dart
+++ b/bin/src/generate_output.dart
@@ -87,15 +87,22 @@ extension on Generator {
       type: field.outputType.type,
     ));
 
+    final fromJson = Method((builder) {
+      builder.lambda = true;
+      builder.requiredParameters.add(Parameter((builder) {
+        builder.name = 'json';
+      }));
+      builder.body = type.property('fromJson').call([refer('json')]).code;
+    });
+
     return refer('json')
         .index(literalString(field.name))
         .asA(TypeReference((type) {
           type.symbol = 'Iterable';
-          type.types.add(refer('Map'));
           type.isNullable = true;
         }))
         .nullSafeProperty('map')
-        .call([type.property('fromJson')]);
+        .call([fromJson.closure]);
   }
 
   Expression generateFromJsonEnumField(dmmf.OutputField field) {
diff --git a/test/.gitignore b/test/.gitignore
new file mode 100644
index 00000000..7f535902
--- /dev/null
+++ b/test/.gitignore
@@ -0,0 +1,2 @@
+generated/
+test.db
\ No newline at end of file
diff --git a/test/find_many_include_ref_test.dart b/test/find_many_include_ref_test.dart
new file mode 100644
index 00000000..7d1ecab7
--- /dev/null
+++ b/test/find_many_include_ref_test.dart
@@ -0,0 +1,47 @@
+import 'package:orm/orm.dart';
+import 'package:test/test.dart';
+
+import 'generated/client.dart';
+import 'generated/prisma.dart';
+
+void main() {
+  late PrismaClient client;
+
+  setUpAll(() async {
+    client = PrismaClient(datasourceUrl: 'file:test/test.db');
+    await client.$connect();
+
+    // Clear database
+    await client.user.deleteMany();
+
+    // Seed database
+    await client.user.create(
+      data: PrismaUnion.$2(
+        UserUncheckedCreateInput(
+          name: "Seven",
+          posts: PostUncheckedCreateNestedManyWithoutAuthorInput(
+            create: PrismaUnion.$2(
+              PrismaUnion.$1([
+                PostCreateWithoutAuthorInput(title: "First post"),
+                PostCreateWithoutAuthorInput(title: "Second post"),
+              ]),
+            ),
+          ),
+        ),
+      ),
+    );
+  });
+
+  tearDownAll(() async {
+    await client.$disconnect();
+  });
+
+  test('findMany include list refer', () async {
+    final users = await client.user.findMany(
+      include: UserInclude(posts: PrismaUnion.$1(true)),
+    );
+
+    expect(users.length, 1);
+    expect(users.first.posts?.length, 2);
+  });
+}
diff --git a/test/schema.prisma b/test/schema.prisma
new file mode 100644
index 00000000..47f70ae5
--- /dev/null
+++ b/test/schema.prisma
@@ -0,0 +1,22 @@
+generator client {
+    provider = "dart run orm"
+    output   = "generated"
+}
+
+datasource db {
+    provider = "sqlite"
+    url      = "file:./test.db"
+}
+
+model User {
+    id    Int    @id @default(autoincrement())
+    name  String
+    posts Post[]
+}
+
+model Post {
+    id       Int    @id @default(autoincrement())
+    title    String
+    author   User   @relation(fields: [authorId], references: [id], onDelete: Cascade)
+    authorId Int
+}