fix: TextCellRenderer null guard (value || '-' swallowed 0); add 6 TextCellRenderer tests

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

ROADMAP.md

@@ -1077,12 +1077,15 @@ The `FlowDesigner` is a canvas-based flow editor that bridges the gap between th
 - `getCellRenderer` standardMap: `lookup` and `master_detail` now correctly reference `LookupCellRenderer`.
 - `fieldRegistry` now explicitly registers `status` → `SelectCellRenderer`, `user` → `UserCellRenderer`, and `owner` → `UserCellRenderer` alongside the existing `lookup`/`master_detail`/`select` registrations.
 
-**Tests:** Added 30 new tests in `cell-renderers.test.tsx`:
+**Tests:** Added 36 new tests in `cell-renderers.test.tsx`:
 - `getCellRenderer` registry assertions for `lookup`, `master_detail`, `status`, `user`, `owner` types
+- `TextCellRenderer`: null, undefined, empty string, numeric zero (0 renders "0" not "-"), boolean false
 - `LookupCellRenderer`: null, empty-string, primitive ID (number), primitive ID (string), unresolved primitive, object with name/label/_id, array of objects, array of primitive IDs resolved via options
 - `UserCellRenderer`: null, primitive number ID, primitive string ID, object with name, object with username, array of user objects
 
-All 307 `@object-ui/fields` tests pass.
+5. **`TextCellRenderer`** — Used `value || '-'` which incorrectly rendered `'-'` for numeric `0` (falsy zero). Updated to `(value != null && value !== '') ? String(value) : '-'` for consistent null-only suppression.
+
+All 313 `@object-ui/fields` tests pass.
 
 ---
 

packages/fields/src/__tests__/cell-renderers.test.tsx

@@ -13,6 +13,7 @@ import {
   SelectCellRenderer,
   LookupCellRenderer,
   UserCellRenderer,
+  TextCellRenderer,
   DateCellRenderer,
   BooleanCellRenderer,
   formatDate,
@@ -91,7 +92,42 @@ describe('getCellRenderer', () => {
 });
 
 // =========================================================================
-// 2. SelectCellRenderer
+// 2. TextCellRenderer
+// =========================================================================
+describe('TextCellRenderer', () => {
+  it('should render text value', () => {
+    render(<TextCellRenderer value="hello" field={{ name: 'title', type: 'text' } as any} />);
+    expect(screen.getByText('hello')).toBeInTheDocument();
+  });
+
+  it('should render dash for null', () => {
+    render(<TextCellRenderer value={null} field={{ name: 'title', type: 'text' } as any} />);
+    expect(screen.getByText('-')).toBeInTheDocument();
+  });
+
+  it('should render dash for undefined', () => {
+    render(<TextCellRenderer value={undefined} field={{ name: 'title', type: 'text' } as any} />);
+    expect(screen.getByText('-')).toBeInTheDocument();
+  });
+
+  it('should render dash for empty string', () => {
+    render(<TextCellRenderer value="" field={{ name: 'title', type: 'text' } as any} />);
+    expect(screen.getByText('-')).toBeInTheDocument();
+  });
+
+  it('should render "0" for numeric zero (not dash)', () => {
+    render(<TextCellRenderer value={0} field={{ name: 'count', type: 'text' } as any} />);
+    expect(screen.getByText('0')).toBeInTheDocument();
+  });
+
+  it('should render "false" for boolean false (not dash)', () => {
+    render(<TextCellRenderer value={false} field={{ name: 'flag', type: 'text' } as any} />);
+    expect(screen.getByText('false')).toBeInTheDocument();
+  });
+});
+
+// =========================================================================
+// 3. SelectCellRenderer
 // =========================================================================
 describe('SelectCellRenderer', () => {
   it('should render badge with explicit color from options', () => {

packages/fields/src/index.tsx

@@ -179,7 +179,7 @@ export function formatDateTime(value: string | Date): string {
  * Text field cell renderer
  */
 export function TextCellRenderer({ value }: CellRendererProps): React.ReactElement {
-  return <span className="truncate">{value || '-'}</span>;
+  return <span className="truncate">{(value != null && value !== '') ? String(value) : '-'}</span>;
 }
 
 /**