Improve Zod error messages (#1320)

packages/uniforms-bridge-zod/__tests__/ZodBridge.ts

@@ -132,23 +132,26 @@ describe('ZodBridge', () => {
       const schema = object({ a: string(), b: number() });
       const bridge = new ZodBridge({ schema });
       const error = bridge.getValidator()({});
-      const messages = error?.issues?.map(issue => issue.message);
+      const messages = ['A: Required', 'B: Required'];
       expect(bridge.getErrorMessages(error)).toEqual(messages);
     });
 
     it('works with arrays', () => {
       const schema = object({ a: array(array(string())) });
       const bridge = new ZodBridge({ schema });
       const error = bridge.getValidator()({ a: [['x', 'y', 0], [1]] });
-      const messages = error?.issues?.map(issue => issue.message);
+      const messages = [
+        'A (0, 2): Expected string, received number',
+        'A (1, 0): Expected string, received number',
+      ];
       expect(bridge.getErrorMessages(error)).toEqual(messages);
     });
 
     it('works with nested objects', () => {
       const schema = object({ a: object({ b: object({ c: string() }) }) });
       const bridge = new ZodBridge({ schema });
       const error = bridge.getValidator()({ a: { b: { c: 1 } } });
-      const messages = error?.issues?.map(issue => issue.message);
+      const messages = ['C: Expected string, received number'];
       expect(bridge.getErrorMessages(error)).toEqual(messages);
     });
   });

packages/uniforms-bridge-zod/src/ZodBridge.ts

@@ -10,6 +10,7 @@ import {
   ZodDefault,
   ZodEnum,
   ZodError,
+  ZodIssue,
   ZodNativeEnum,
   ZodNumber,
   ZodNumberDef,
@@ -28,6 +29,23 @@ function isNativeEnumValue(value: unknown) {
   return typeof value !== 'string';
 }
 
+function getLabel(value: unknown) {
+  return upperFirst(lowerCase(joinName(null, value).slice(-1)[0]));
+}
+
+function getFullLabel(path: ZodIssue['path'], indexes: number[] = []): string {
+  const lastElement = path[path.length - 1];
+
+  if (typeof lastElement === 'number') {
+    const slicedPath = path.slice(0, path.length - 1);
+    return getFullLabel(slicedPath, [lastElement, ...indexes]);
+  }
+
+  return indexes.length > 0
+    ? `${getLabel(path)} (${indexes.join(', ')})`
+    : getLabel(path);
+}
+
 /** Option type used in SelectField or RadioField */
 type Option<Value> = {
   disabled?: boolean;
@@ -73,9 +91,10 @@ export default class ZodBridge<T extends ZodRawShape> extends Bridge {
 
   getErrorMessages(error: unknown) {
     if (error instanceof ZodError) {
-      // TODO: There's no information which field caused which error. We could
-      // do some generic prefixing, e.g., `{name}: {message}`.
-      return error.issues.map(issue => issue.message);
+      return error.issues.map(issue => {
+        const name = getFullLabel(issue.path);
+        return `${name}: ${issue.message}`;
+      });
     }
 
     if (error instanceof Error) {
@@ -149,7 +168,7 @@ export default class ZodBridge<T extends ZodRawShape> extends Bridge {
   getProps(name: string) {
     const props: UnknownObject & { options?: Option<unknown>[] } = {
       ...(this.provideDefaultLabelFromFieldName && {
-        label: upperFirst(lowerCase(joinName(null, name).slice(-1)[0])),
+        label: getLabel(name),
       }),
       required: true,
     };

packages/uniforms/__suites__/ErrorsField.tsx

@@ -15,7 +15,9 @@ export function testErrorsField(ErrorsField: ComponentType<any>) {
       ]),
       schema: z.object({ x: z.boolean(), y: z.number(), z: z.string() }),
     });
-    expect(screen.getAllByText(errorMessage)).toHaveLength(3);
+    expect(screen.getByText(`X: ${errorMessage}`)).toBeInTheDocument();
+    expect(screen.getByText(`Y: ${errorMessage}`)).toBeInTheDocument();
+    expect(screen.getByText(`Z: ${errorMessage}`)).toBeInTheDocument();
   });
 
   test('<ErrorsField> - renders error from props', () => {