diff --git a/src/app/components/Controls.jsx b/src/app/components/Controls.jsx
index 1b49d31..e8894dd 100644
--- a/src/app/components/Controls.jsx
+++ b/src/app/components/Controls.jsx
@@ -12,6 +12,7 @@ export default function Controls({ onControlChange }) {
     useDefaultValue: false,
     requiredProperties: false,
     useFreezed: false,
+    useHive: false,
   };
 
   const loadSavedSettings = () => {
@@ -164,9 +165,7 @@ export default function Controls({ onControlChange }) {
             />
             <span>
               Use{" "}
-              <span className="font-mono font-bold text-blue-600">
-                Freezed
-              </span>
+              <span className="font-mono font-bold text-blue-600">Freezed</span>
             </span>
           </label>
 
@@ -174,11 +173,14 @@ export default function Controls({ onControlChange }) {
             <input
               type="checkbox"
               className="settings-checkbox"
-              checked={controls.useDefaultValue}
-              id="useDefaultValue"
+              checked={controls.useHive}
+              id="useHive"
               onClick={handleCheckboxChange}
             />
-            <span>Use default value </span>
+            <span>
+              Use{" "}
+              <span className="font-mono font-bold text-blue-600">HIVE</span>
+            </span>
           </label>
 
           <label className="flex items-center space-x-2">
diff --git a/src/app/utils/CustomDartRender.ts b/src/app/utils/CustomDartRender.ts
index b0584fe..9ca50a7 100644
--- a/src/app/utils/CustomDartRender.ts
+++ b/src/app/utils/CustomDartRender.ts
@@ -63,7 +63,7 @@ import {
 } from "quicktype-core/dist/support/Strings";
 import { defined } from "quicktype-core/dist/support/Support";
 import { CustomDartOption } from ".";
-import { generateDartOptions } from "./Generate_dart_options";
+import { generateDartOptions } from "./GeneratDartClass";
 export const dartOptions = {
   nullSafety: new BooleanOption("null-safety", "Null Safety", true),
   justTypes: new BooleanOption("just-types", "Types only", true),
@@ -735,35 +735,11 @@ export class DartRenderer extends ConvenienceRenderer {
         if (maybeNullable === null) {
           return dynamic;
         }
-        const type = this.dartType(t, true);
-        let isAClass = false;
-        let hasDefaultValue =
-          !Array.isArray(type) &&
-          type !== "DateTime" &&
-          this._options.useDefaultValue;
-        let defaultValue = null;
-        if (typeof type == "object") {
-          let isArray = Array.isArray(type);
-          isAClass = !isArray && type["kind"] !== "annotated";
-        }
-        if (hasDefaultValue) {
-          defaultValue = this.getDefaultValueForType(type);
-        }
-        return isAClass
-          ? [
-              dynamic,
-              " == null ? null : ",
-              this.fromDynamicExpression(maybeNullable, dynamic),
-            ]
-          : hasDefaultValue
-          ? [
-              this.fromDynamicExpression(
-                maybeNullable,
-                dynamic,
-                ` ?? ${defaultValue}`
-              ),
-            ]
-          : [this.fromDynamicExpression(maybeNullable, dynamic)];
+        return this.fromDynamicExpression(
+          unionType.isNullable,
+          maybeNullable,
+          dynamic
+        );
       },
       (transformedStringType) => {
         switch (transformedStringType.kind) {
diff --git a/src/app/utils/Generate_dart_options.ts b/src/app/utils/GeneratDartClass.ts
similarity index 99%
rename from src/app/utils/Generate_dart_options.ts
rename to src/app/utils/GeneratDartClass.ts
index f7fbe50..06ee8a8 100644
--- a/src/app/utils/Generate_dart_options.ts
+++ b/src/app/utils/GeneratDartClass.ts
@@ -56,7 +56,7 @@ export const generateDartOptions = (options: CustomDartOption) => {
     useHive: new BooleanOption(
       "use-hive",
       "Generate annotations for Hive type adapters",
-      false,
+      options.useHive,
       "secondary"
     ),
     useJsonAnnotation: new BooleanOption(
diff --git a/src/app/utils/index.ts b/src/app/utils/index.ts
index 304d8a7..51e51d1 100644
--- a/src/app/utils/index.ts
+++ b/src/app/utils/index.ts
@@ -23,6 +23,7 @@ export type CustomDartOption = {
   finalProperties: boolean;
   generateFromJson: boolean;
   useFreezed: boolean;
+  useHive: boolean;
 };
 
 export async function runQuickType(