fix(core): handle fieldset members in FormInput

dev/test-studio/schema/debug/objectsDebug.ts

@@ -213,6 +213,28 @@ const animals = defineField({
   of: [animal],
 })
 
+const fieldsetArray = defineField({
+  type: 'array',
+  name: 'fieldsetArray',
+  title: 'Fieldset array',
+
+  fieldset: 'fieldset',
+
+  of: [
+    {
+      type: 'object',
+      name: 'myObject',
+      fields: [
+        {
+          name: 'string',
+          type: 'string',
+          title: 'String',
+        },
+      ],
+    },
+  ],
+})
+
 const arrayOfImages = defineField({
   type: 'array',
   name: 'arrayOfImages',
@@ -353,6 +375,14 @@ const arrayOfMixedTypes = defineField({
 export const objectsDebug = defineType({
   type: 'document',
   name: 'objectsDebug',
+
+  fieldsets: [
+    {
+      name: 'fieldset',
+      title: 'Fieldset',
+    },
+  ],
+
   fields: [
     {
       name: 'title',
@@ -361,6 +391,7 @@ export const objectsDebug = defineType({
     animals,
     arrayOfMixedTypes,
     body,
+    fieldsetArray,
     objectWithArray,
     arrayOfAnonymousObjects,
     arrayOfImages,

packages/sanity/playwright-ct/tests/formBuilder/tree-editing/TreeEditing.spec.tsx

@@ -29,6 +29,19 @@ const DOCUMENT_VALUE: SanityDocument = {
       title: 'My object 3',
     },
   ],
+
+  myFieldsetArray: [
+    {
+      _type: 'myObject',
+      _key: 'key-1',
+      title: 'My object 1',
+    },
+    {
+      _type: 'myObject',
+      _key: 'key-2',
+      title: 'My object 2',
+    },
+  ],
 }
 
 test.describe('Tree editing', () => {
@@ -38,8 +51,10 @@ test.describe('Tree editing', () => {
   }) => {
     await mount(<TreeEditingStory />)
 
+    const field = page.getByTestId('field-myArrayOfObjects')
+
     // Add an item
-    await page.getByTestId('add-single-object-button').click()
+    await field.getByTestId('add-single-object-button').click()
 
     // Wait for the dialog to be visible
     await expect(page.getByTestId('tree-editing-dialog')).toBeVisible()
@@ -57,8 +72,10 @@ test.describe('Tree editing', () => {
   }) => {
     await mount(<TreeEditingStory legacyEditing />)
 
+    const field = page.getByTestId('field-myArrayOfObjects')
+
     // Add an item
-    await page.getByTestId('add-single-object-button').click()
+    await field.getByTestId('add-single-object-button').click()
 
     // Test that the legacy dialog is visible and the tree editing dialog is not
     await expect(page.getByTestId('tree-editing-dialog')).not.toBeVisible()
@@ -169,6 +186,21 @@ test.describe('Tree editing', () => {
     await expect(stringInput).toHaveValue('My object 2')
   })
 
+  test('should open dialog with correct form view based on the openPath when the array is in a fieldset', async ({
+    mount,
+    page,
+  }) => {
+    await mount(
+      <TreeEditingStory value={DOCUMENT_VALUE} openPath={['myFieldsetArray', {_key: 'key-2'}]} />,
+    )
+
+    const dialog = page.getByTestId('tree-editing-dialog')
+    await expect(dialog).toBeVisible()
+
+    const stringInput = dialog.getByTestId('string-input')
+    await expect(stringInput).toHaveValue('My object 2')
+  })
+
   test('should not open dialog when the openPath does not match any item', async ({
     mount,
     page,

packages/sanity/playwright-ct/tests/formBuilder/tree-editing/TreeEditingStory.tsx

@@ -18,14 +18,44 @@ function getSchemaTypes(opts: GetSchemaTypesOpts) {
       type: 'document',
       name: 'test',
       title: 'Test',
+
+      fieldsets: [
+        {
+          name: 'fieldset',
+        },
+      ],
+
       fields: [
         defineField({
           type: 'array',
           name: 'myArrayOfObjects',
           title: 'My array of objects',
+
           options: {
             treeEditing: treeEditingEnabled,
           },
+
+          of: [
+            {
+              type: 'object',
+              name: 'myObject',
+              fields: [
+                {
+                  type: 'string',
+                  name: 'title',
+                  title: 'Title',
+                },
+              ],
+            },
+          ],
+        }),
+
+        defineField({
+          type: 'array',
+          name: 'myFieldsetArray',
+          title: 'My fieldset array',
+          fieldset: 'fieldset',
+
           of: [
             {
               type: 'object',

packages/sanity/src/core/form/components/FormInput.tsx

@@ -249,11 +249,19 @@ const FormInputInner = memo(function FormInputInner(
 
   if (isObjectInputProps(props)) {
     const childPath = trimLeft(props.path, absolutePath)
+
     const fieldMember = props.members.find(
       (member): member is FieldMember => member.kind == 'field' && childPath[0] === member.name,
     )
 
-    if (!fieldMember) {
+    const fieldSetMember = props.members
+      .filter((member) => member.kind === 'fieldSet')
+      .flatMap((member) => (member.kind === 'fieldSet' && member.fieldSet?.members) || [])
+      .find((m): m is FieldMember => m.kind === 'field' && m.name === childPath[0])
+
+    const member = fieldMember || fieldSetMember
+
+    if (!member) {
       const fieldName =
         typeof childPath[0] === 'string' ? childPath[0] : JSON.stringify(childPath[0])
 
@@ -262,7 +270,7 @@ const FormInputInner = memo(function FormInputInner(
 
     return (
       <MemberField
-        member={fieldMember}
+        member={member}
         renderAnnotation={renderAnnotation}
         renderBlock={renderBlock}
         renderInput={renderInput}