fix for undefined handling

.gitignore

@@ -104,3 +104,4 @@ dist
 .tern-port
 
 /build
+.history

package.json

@@ -1,6 +1,6 @@
 {
   "name": "remix-hook-form",
-  "version": "5.0.4",
+  "version": "5.1.0",
   "description": "Utility wrapper around react-hook-form for use with Remix.run",
   "type": "module",
   "main": "./dist/index.cjs",

src/testing-app/app/root.tsx

@@ -33,4 +33,4 @@ function App() {
     </html>
   );
 }
-export default withDevTools(App);
+export default App;

src/testing-app/app/routes/_index.tsx

@@ -3,7 +3,7 @@ import {
   json,
   type ActionFunctionArgs,
   unstable_parseMultipartFormData,
-  LoaderFunctionArgs,
+  type LoaderFunctionArgs,
   type UploadHandler,
 } from "@remix-run/node";
 import { Form, useFetcher } from "@remix-run/react";
@@ -17,22 +17,7 @@ import {
   RemixFormProvider,
 } from "remix-hook-form";
 import { z } from "zod";
-import {
-  generateObjectSchema,
-  stringOptional,
-  stringRequired,
-  dateOfBirthRequired,
-  emailOptional,
-  booleanOptional,
-  booleanRequired,
-} from "~/zod";
-const MAX_FILE_SIZE = 500000;
-const ACCEPTED_IMAGE_TYPES = [
-  "image/jpeg",
-  "image/jpg",
-  "image/png",
-  "image/webp",
-];
+
 export const fileUploadHandler =
   (): UploadHandler =>
   async ({ data, filename }) => {
@@ -51,30 +36,26 @@ export const fileUploadHandler =
     return new File([buffer], filename, { type: "image/jpeg" });
   };
 
-export const patientBaseSchema = generateObjectSchema({
-  file: z.any().optional(),
-});
 const FormDataZodSchema = z.object({
   email: z.string().trim().nonempty("validation.required"),
   password: z.string().trim().nonempty("validation.required"),
   number: z.number({ coerce: true }).int().positive(),
   redirectTo: z.string().optional(),
+  boolean: z.boolean().optional(),
+  date: z.date().or(z.string()),
+  null: z.null(),
 });
 
-type FormData = z.infer<typeof patientBaseSchema>;
+type SchemaFormData = z.infer<typeof FormDataZodSchema>;
 
-const resolver = zodResolver(patientBaseSchema);
+const resolver = zodResolver(FormDataZodSchema);
 export const loader = ({ request }: LoaderFunctionArgs) => {
   const data = getFormDataFromSearchParams(request);
   return json({ result: "success" });
 };
 export const action = async ({ request }: ActionFunctionArgs) => {
-  const formData = await unstable_parseMultipartFormData(
-    request,
-    fileUploadHandler(),
-  );
-  console.log(formData.get("file"));
-  const { errors, data } = await getValidatedFormData(formData, resolver);
+  const { errors, data } = await getValidatedFormData(request, resolver);
+  console.log(data, errors);
   if (errors) {
     return json(errors, {
       status: 422,
@@ -89,28 +70,26 @@ export default function Index() {
     resolver,
     fetcher,
     defaultValues: {
-      file: undefined,
+      redirectTo: undefined,
+      number: 4,
+      email: "[email protected]",
+      password: "test",
+      date: new Date(),
+      boolean: true,
+      null: null,
     },
     submitData: {
       test: "test",
     },
   });
   const { register, handleSubmit, formState, watch, setError } = methods;
-  useEffect(() => {
-    setError("root.file", {
-      message: "File is required",
-    });
-  }, []);
+
   console.log(formState.errors);
   return (
     <RemixFormProvider {...methods}>
       <p>Add a thing...</p>
 
       <Form method="post" encType="multipart/form-data" onSubmit={handleSubmit}>
-        <input type="file" {...register("file")} />
-        {formState.errors.file && (
-          <p className="error">{formState.errors.file.message}</p>
-        )}
         <div>
           <button type="submit" className="button">
             Add

src/utilities/index.test.ts

@@ -32,6 +32,30 @@ describe("createFormData", () => {
     expect(formData.get("bool")).toEqual(data.bool.toString());
   });
 
+  it("should create a FormData object with the provided data and remove undefined values", () => {
+    const data = {
+      name: "John Doe",
+      age: 30,
+      bool: true,
+      b: undefined,
+      a: null,
+      object: {
+        test: "1",
+        number: 2,
+      },
+      array: [1, 2, 3],
+    };
+    const formData = createFormData(data);
+
+    expect(formData.get("name")).toEqual(JSON.stringify(data.name));
+    expect(formData.get("age")).toEqual(data.age.toString());
+    expect(formData.get("object")).toEqual(JSON.stringify(data.object));
+    expect(formData.get("array")).toEqual(JSON.stringify(data.array));
+    expect(formData.get("bool")).toEqual(data.bool.toString());
+    expect(formData.get("b")).toEqual(null);
+    expect(formData.get("a")).toEqual("null");
+  });
+
   it("should handle null data", () => {
     const formData = createFormData(null as any);
     expect(formData).toBeTruthy();
@@ -356,6 +380,40 @@ describe("createFormData", () => {
       },
     });
   });
+
+  it("doesn't send undefined values to the backend but sends null values", async () => {
+    const formData = createFormData({
+      name: "123",
+      age: 30,
+      hobbies: ["Reading", "Writing", "Coding"],
+      boolean: true,
+      a: null,
+      b: undefined,
+      numbers: [1, 2, 3],
+      other: {
+        skills: ["testing", "testing"],
+        something: "else",
+      },
+    });
+    const request = new Request("http://localhost:3000", { method: "POST" });
+    const requestFormDataSpy = vi.spyOn(request, "formData");
+
+    requestFormDataSpy.mockResolvedValueOnce(formData);
+    const parsed = await parseFormData<typeof formData>(request);
+
+    expect(parsed).toStrictEqual({
+      name: "123",
+      age: 30,
+      hobbies: ["Reading", "Writing", "Coding"],
+      boolean: true,
+      a: null,
+      numbers: [1, 2, 3],
+      other: {
+        skills: ["testing", "testing"],
+        something: "else",
+      },
+    });
+  });
 });
 
 describe("getValidatedFormData", () => {

src/utilities/index.ts

@@ -153,29 +153,40 @@ export const createFormData = <T extends FieldValues>(
   if (!data) {
     return formData;
   }
-  Object.entries(data).map(([key, value]) => {
+  for (const [key, value] of Object.entries(data)) {
+    // Skip undefined values
+    if (value === undefined) {
+      continue;
+    }
+    // Handle FileList
     if (value instanceof FileList) {
       for (let i = 0; i < value.length; i++) {
         formData.append(key, value[i]);
       }
-      return;
+      continue;
     }
     if (value instanceof File || value instanceof Blob) {
       formData.append(key, value);
-    } else {
-      if (stringifyAll) {
-        formData.append(key, JSON.stringify(value));
-      } else {
-        if (typeof value === "string") {
-          formData.append(key, value);
-        } else if (value instanceof Date) {
-          formData.append(key, value.toISOString());
-        } else {
-          formData.append(key, JSON.stringify(value));
-        }
-      }
+      continue;
+    }
+    // Stringify all values if set
+    if (stringifyAll) {
+      formData.append(key, JSON.stringify(value));
+      continue;
+    }
+    // Handle strings
+    if (typeof value === "string") {
+      formData.append(key, value);
+    }
+    // Handle dates
+    if (value instanceof Date) {
+      formData.append(key, value.toISOString());
     }
-  });
+    // Handle all the other values
+    else {
+      formData.append(key, JSON.stringify(value));
+    }
+  }
 
   return formData;
 };