Fix Form breaks when setting undefined value to object

packages/ra-core/src/form/sanitizeEmptyValues.spec.ts

@@ -0,0 +1,48 @@
+import expect from 'expect';
+import sanitizeEmptyValues from './sanitizeEmptyValues';
+
+describe('sanitizeEmptyValues', () => {
+    it('should set null or undefined values to null', () => {
+        expect(sanitizeEmptyValues({ foo: 23 }, {})).toEqual({ foo: null });
+        expect(sanitizeEmptyValues({ foo: 'hello' }, {})).toEqual({
+            foo: null,
+        });
+        expect(sanitizeEmptyValues({ foo: new Date() }, {})).toEqual({
+            foo: null,
+        });
+        expect(sanitizeEmptyValues({ foo: { bar: 2 } }, {})).toEqual({
+            foo: null,
+        });
+    });
+    it('should set null or undefined deep values to null', () => {
+        expect(sanitizeEmptyValues({ foo: { bar: 1 } }, { foo: {} })).toEqual({
+            foo: { bar: null },
+        });
+    });
+    it('should accept string values', () => {
+        const str = 'hello';
+        expect(sanitizeEmptyValues({ str: null }, { str })).toEqual({ str });
+        expect(sanitizeEmptyValues({}, { str })).toEqual({ str });
+    });
+    it('should accept date values', () => {
+        const date = new Date();
+        expect(sanitizeEmptyValues({ date: null }, { date })).toEqual({ date });
+        expect(sanitizeEmptyValues({}, { date })).toEqual({ date });
+    });
+    it('should accept array values', () => {
+        const arr = [1, 2, 3];
+        expect(sanitizeEmptyValues({ arr: null }, { arr })).toEqual({ arr });
+        expect(sanitizeEmptyValues({}, { arr })).toEqual({ arr });
+    });
+    it('should accept object values', () => {
+        const obj = { foo: 1 };
+        expect(sanitizeEmptyValues({ obj: null }, { obj })).toEqual({ obj });
+        expect(sanitizeEmptyValues({}, { obj })).toEqual({ obj });
+    });
+    it('should accept deep object values', () => {
+        const obj = { foo: { bar: 1 } };
+        expect(
+            sanitizeEmptyValues({ obj: { foo: null, foo2: 2 } }, { obj })
+        ).toEqual({ obj: { foo: { bar: 1 }, foo2: null } });
+    });
+});

packages/ra-core/src/form/sanitizeEmptyValues.ts

@@ -3,30 +3,36 @@ import merge from 'lodash/merge';
 /**
  * Because final-form removes undefined and empty string values completely
  * (the key for the empty field is removed from the values), we have to check
- * wether this value was initially provided so that it is correctly sent to
+ * whether this value was initially provided so that it is correctly sent to
  * the backend.
- * See https://github.com/final-form/react-final-form/issues/130#issuecomment-493447888
+ * @see https://github.com/final-form/react-final-form/issues/130#issuecomment-493447888
  *
  * @param initialValues The initial values provided to the form
  * @param values The current form values
  */
 const sanitizeEmptyValues = (initialValues: object, values: object) => {
-    // For every field initialy provided, we check wether it value has been removed
+    // For every field initially provided, we check whether it value has been removed
     // and set it explicitly to an empty string
+    if (!initialValues) return values;
     const initialValuesWithEmptyFields = Object.keys(initialValues).reduce(
         (acc, key) => {
-            if (typeof values[key] === 'object' && values[key] !== null) {
+            if (values[key] instanceof Date || Array.isArray(values[key])) {
+                acc[key] = values[key];
+            } else if (
+                typeof values[key] === 'object' &&
+                values[key] !== null
+            ) {
                 acc[key] = sanitizeEmptyValues(initialValues[key], values[key]);
             } else {
                 acc[key] =
-                    typeof values[key] === 'undefined' ? '' : values[key];
+                    typeof values[key] === 'undefined' ? null : values[key];
             }
             return acc;
         },
         {}
     );
 
-    // Finaly, we merge back the values to not miss any which wasn't initialy provided
+    // Finally, we merge back the values to not miss any which wasn't initially provided
     return merge(initialValuesWithEmptyFields, values);
 };