Returns error from controllers & add support for custom onFailure on useShowController

docs/CreateEdit.md

@@ -500,7 +500,7 @@ const PostEdit = props => {
 
 The `onFailure` function receives the error from the dataProvider call (`dataProvider.create()` or `dataProvider.update()`), which is a JavaScript Error object (see [the dataProvider documentation for details](./DataProviders.md#error-format)).
 
-The default `onOnFailure` function is:
+The default `onFailure` function is:
 
 ```jsx
 // for the <Create> component:
@@ -739,6 +739,7 @@ const MyEdit = props => {
     const {
         basePath, // deduced from the location, useful for action buttons
         defaultTitle, // the translated title based on the resource, e.g. 'Post #123'
+        error,  // error returned by dataProvider when it failed to fetch the record. Useful if you want to adapt the view instead of just showing a notification using the `onFailure` side effect.
         loaded, // boolean that is false until the record is available
         loading, // boolean that is true on mount, and false once the record was fetched
         record, // record fetched via dataProvider.getOne() based on the id from the location

docs/Show.md

@@ -19,6 +19,7 @@ Here are all the props accepted by the `<Show>` component:
 * [`actions`](#actions)
 * [`aside`](#aside-component)
 * [`component`](#component)
+* [`onFailure`](#onfailure)
 
 ### CSS API
 
@@ -194,6 +195,50 @@ const PostShow = props => (
 
 The default value for the `component` prop is `Card`.
 
+
+### `onFailure`
+
+By default, when the getOne action fails at the dataProvider level, react-admin shows an error notification and  refreshes the page.
+
+You can override this behavior and pass custom side effects by providing a function as `onFailure` prop:
+
+```jsx
+import * as React from 'react';
+import { useNotify, useRefresh, useRedirect, Show, SimpleShowLayout } from 'react-admin';
+
+const PostShow = props => {
+    const notify = useNotify();
+    const refresh = useRefresh();
+    const redirect = useRedirect();
+
+    const onFailure = (error) => {
+        notify(`Could not load post: ${error.message}`)
+        redirect('/posts');
+        refresh();
+    };
+
+    return (
+        <Show onFailure={onFailure} {...props}>
+            <SimpleShowLayout>
+                ...
+            </SimpleShowLayout>
+        </Show>
+    );
+}
+```
+
+The `onFailure` function receives the error from the dataProvider call (`dataProvider.getOne()`), which is a JavaScript Error object (see [the dataProvider documentation for details](./DataProviders.md#error-format)).
+
+The default `onFailure` function is:
+
+```jsx
+(error) => {
+    notify('ra.notification.item_doesnt_exist', 'warning');
+    redirect('list', basePath);
+    refresh();
+}
+```
+
 ## The `<ShowGuesser>` component
 
 Instead of a custom `Show`, you can use the `ShowGuesser` to determine which fields to use based on the data returned by the API.
@@ -237,6 +282,7 @@ const MyShow = props => {
     const {
         basePath, // deduced from the location, useful for action buttons
         defaultTitle, // the translated title based on the resource, e.g. 'Post #123'
+        error,  // error returned by dataProvider when it failed to fetch the record. Useful if you want to adapt the view instead of just showing a notification using the `onFailure` side effect.
         loaded, // boolean that is false until the record is available
         loading, // boolean that is true on mount, and false once the record was fetched
         record, // record fetched via dataProvider.getOne() based on the id from the location

packages/ra-core/src/controller/details/useEditController.ts

@@ -49,6 +49,7 @@ export interface EditControllerProps<RecordType extends Record = Record> {
     // Necessary for actions (EditActions) which expect a data prop containing the record
     // @deprecated - to be removed in 4.0d
     data?: RecordType;
+    error?: any;
     defaultTitle: string;
     hasCreate?: boolean;
     hasEdit?: boolean;
@@ -138,18 +139,16 @@ export const useEditController = <RecordType extends Record = Record>(
         setTransform,
     } = useSaveModifiers({ onSuccess, onFailure, transform });
 
-    const { data: record, loading, loaded, refetch } = useGetOne<RecordType>(
-        resource,
-        id,
-        {
-            action: CRUD_GET_ONE,
-            onFailure: () => {
-                notify('ra.notification.item_doesnt_exist', 'warning');
-                redirect('list', basePath);
-                refresh();
-            },
-        }
-    );
+    const { data: record, error, loading, loaded, refetch } = useGetOne<
+        RecordType
+    >(resource, id, {
+        action: CRUD_GET_ONE,
+        onFailure: () => {
+            notify('ra.notification.item_doesnt_exist', 'warning');
+            redirect('list', basePath);
+            refresh();
+        },
+    });
 
     const getResourceLabel = useGetResourceLabel();
     const defaultTitle = translate('ra.page.edit', {
@@ -248,6 +247,7 @@ export const useEditController = <RecordType extends Record = Record>(
     );
 
     return {
+        error,
         loading,
         loaded,
         saving,

packages/ra-core/src/controller/details/useShowController.ts

@@ -1,6 +1,6 @@
 import useVersion from '../useVersion';
 import { useCheckMinimumRequiredProps } from '../checkMinimumRequiredProps';
-import { Record, Identifier } from '../../types';
+import { Record, Identifier, OnFailure } from '../../types';
 import { useGetOne, Refetch } from '../../dataProvider';
 import { useTranslate } from '../../i18n';
 import { useNotify, useRedirect, useRefresh } from '../../sideEffect';
@@ -14,6 +14,7 @@ export interface ShowProps {
     hasShow?: boolean;
     hasList?: boolean;
     id?: Identifier;
+    onFailure?: OnFailure;
     resource?: string;
     [key: string]: any;
 }
@@ -24,6 +25,7 @@ export interface ShowControllerProps<RecordType extends Record = Record> {
     // Necessary for actions (EditActions) which expect a data prop containing the record
     // @deprecated - to be removed in 4.0d
     data?: RecordType;
+    error?: any;
     loading: boolean;
     loaded: boolean;
     hasCreate?: boolean;
@@ -57,25 +59,33 @@ export const useShowController = <RecordType extends Record = Record>(
     props: ShowProps
 ): ShowControllerProps<RecordType> => {
     useCheckMinimumRequiredProps('Show', ['basePath', 'resource'], props);
-    const { basePath, hasCreate, hasEdit, hasList, hasShow, id } = props;
+    const {
+        basePath,
+        hasCreate,
+        hasEdit,
+        hasList,
+        hasShow,
+        id,
+        onFailure,
+    } = props;
     const resource = useResourceContext(props);
     const translate = useTranslate();
     const notify = useNotify();
     const redirect = useRedirect();
     const refresh = useRefresh();
     const version = useVersion();
-    const { data: record, loading, loaded, refetch } = useGetOne<RecordType>(
-        resource,
-        id,
-        {
-            action: CRUD_GET_ONE,
-            onFailure: () => {
+    const { data: record, error, loading, loaded, refetch } = useGetOne<
+        RecordType
+    >(resource, id, {
+        action: CRUD_GET_ONE,
+        onFailure:
+            onFailure ??
+            (() => {
                 notify('ra.notification.item_doesnt_exist', 'warning');
                 redirect('list', basePath);
                 refresh();
-            },
-        }
-    );
+            }),
+    });
 
     const getResourceLabel = useGetResourceLabel();
     const defaultTitle = translate('ra.page.show', {
@@ -85,6 +95,7 @@ export const useShowController = <RecordType extends Record = Record>(
     });
 
     return {
+        error,
         loading,
         loaded,
         defaultTitle,