<Create>

The <Create> component is the main component for creation pages. It prepares a form submit handler, and renders the page title and actions. It is not responsible for rendering the actual form - that’s the job of its child component (usually a form component, like <SimpleForm>). This form component uses its children (<Input> components) to render each form input.

post creation form

The <Create> component creates a RecordContext with an empty object {} by default. It also creates a SaveContext containing a save callback, which calls dataProvider.create(), and a CreateContext containing both the record and the callback.

Usage

Wrap the <Create> component around the form you want to create, then pass it as create prop of a given <Resource>. <Create> requires no prop by default - it deduces the resource from the current URL.

For instance, the following component will render a creation form with 4 inputs when users browse to /posts/create:

// in src/posts.js
import * as React from "react";
import { Create, SimpleForm, TextInput, DateInput, required } from 'react-admin';
import RichTextInput from 'ra-input-rich-text';

export const PostCreate = () => (
    <Create>
        <SimpleForm>
            <TextInput source="title" validate={[required()]} fullWidth />
            <TextInput source="teaser" multiLine={true} label="Short description" />
            <RichTextInput source="body" />
            <DateInput label="Publication date" source="published_at" defaultValue={new Date()} />
        </SimpleForm>
    </Create>
);

// in src/App.js
import * as React from "react";
import { Admin, Resource } from 'react-admin';
import jsonServerProvider from 'ra-data-json-server';

import { PostCreate } from './posts';

const App = () => (
    <Admin dataProvider={jsonServerProvider('https://jsonplaceholder.typicode.com')}>
        <Resource name="posts" create={PostCreate} />
    </Admin>
);

export default App;

You can customize the <Create> component using the following props:

  • actions: override the actions toolbar with a custom component
  • aside: component to render aside to the main content
  • children: the components that renders the form
  • className: passed to the root component
  • component: override the root component
  • disableAuthentication: disable the authentication check
  • mutationOptions: options for the dataProvider.create() call
  • record: initialize the form with a record
  • redirect: change the redirect location after successful creation
  • resource: override the name of the resource to create
  • sx: Override the styles
  • title: override the page title
  • transform: transform the form data before calling dataProvider.create()

actions

You can replace the list of default actions by your own elements using the actions prop:

import * as React from "react";
import Button from '@mui/material/Button';
import { TopToolbar, Create } from 'react-admin';

const PostCreateActions = () => (
    <TopToolbar>
        {/* Add your custom actions */}
        <Button color="primary" onClick={customAction}>Custom Action</Button>
    </TopToolbar>
);

export const PostCreate = () => (
    <Create actions={<PostCreateActions />}>
        ...
    </Create>
);

aside

Aside component

You may want to display additional information on the side of the form. Use the aside prop for that, passing the component of your choice:

const Aside = () => (
    <Box sx={{ width: '200px', margin: '1em' }}>
        <Typography variant="h6">Instructions</Typography>
        <Typography variant="body2">
            Posts will only be published once an editor approves them
        </Typography>
    </Box>
);

const PostCreate = () => (
    <Create aside={<Aside />}>
       // ...
    </Create>
);

component

By default, the <Create> view render the main form inside a MUI <Card> element. The actual layout of the form depends on the Form component you’re using (<SimpleForm>, <TabbedForm>, or a custom form component).

Some form layouts also use Card, in which case the user ends up seeing a card inside a card, which is bad UI. To avoid that, you can override the main page container by passing a component prop :

// use a div as root component
const PostCreate = () => (
    <Create component="div">
        ...
    </Create>
);

// use a custom component as root component 
const PostCreate = () => (
    <Create component={MyComponent}>
        ...
    </Create>
);

The default value for the component prop is Card.

disableAuthentication

By default, the <Create> component will automatically redirect the user to the login page if the user is not authenticated. If you want to disable this behavior and allow anonymous access to a creation page, set the disableAuthentication prop to true.

const PostCreate = () => (
    <Create disableAuthentication>
        ...
    </Create>
);

mutationOptions

You can customize the options you pass to react-query’s useMutation hook, e.g. to override success or error side effects, by setting the mutationOptions prop. Refer to the useMutation documentation in the react-query website for a list of the possible options.

Let’s see an example with the success side effect. By default, when the save action succeeds, react-admin shows a notification, and redirects to the new record edit page. You can override this behavior and pass custom success side effects by providing a mutationOptions prop with an onSuccess key:

import * as React from 'react';
import { useNotify, useRedirect, Create, SimpleForm } from 'react-admin';

const PostCreate = () => {
    const notify = useNotify();
    const redirect = useRedirect();

    const onSuccess = (data) => {
        notify(`Changes saved`);
        redirect(`/posts/${data.id}`);
    };

    return (
        <Create mutationOptions={{ onSuccess }}>
            <SimpleForm>
                ...
            </SimpleForm>
        </Create>
    );
}

The default onSuccess function is:

(data) => {
    notify('ra.notification.created', { messageArgs: { smart_count: 1 } });
    redirect('edit', resource, data.id, data);
}

Tip: If you just want to customize the redirect behavior, you can use the redirect prop instead.

Tip: If you want to have different success side effects based on the button clicked by the user (e.g. if the creation form displays two submit buttons, one to “save and redirect to the list”, and another to “save and display an empty form”), you can set the mutationOptions prop on the <SaveButton> component, too.

Similarly, you can override the failure side effects with an onError option. By default, when the save action fails at the dataProvider level, react-admin shows an error notification.

import * as React from 'react';
import { useNotify, Create, SimpleForm } from 'react-admin';

const PostCreate = () => {
    const notify = useNotify();

    const onError = (error) => {
        notify(`Could not create post: ${error.message}`);
    };

    return (
        <Create mutationOptions={{ onError }}>
            <SimpleForm>
                ...
            </SimpleForm>
        </Create>
    );
}

The onError function receives the error from the dataProvider.create() call. It is a JavaScript Error object (see the dataProvider documentation for details).

The default onError function is:

(error) => {
    notify(typeof error === 'string' ? error : error.message || 'ra.notification.http_error', { type: 'warning' });
}

Tip: If you want to have different failure side effects based on the button clicked by the user, you can set the mutationOptions prop on the <SaveButton> component, too.

record

The record prop allows to initialize the form with non-empty values. It is exposed for consistency with the <Edit> component, but if you need default values, you should use the defautValues prop on the Form element instead.

redirect

By default, submitting the form in the <Create> view redirects to the <Edit> view.

You can customize the redirection by setting the redirect prop to one of the following values:

  • 'edit': redirect to the Edit view (the default)
  • 'list': redirect to the List view
  • 'show': redirect to the Show view
  • false: do not redirect
const PostCreate = () => (
    <Create redirect="list">
        ...
    </Create>
);

Note that the redirect prop is ignored if you set the mutationOptions prop. See that prop for how to set a different redirection path in that case.

If you want to allow the user to enter several records one after the other, setting redirect to false won’t make it, as the form isn’t emptied by default. You’ll have to empty the form using the mutationOptions, and this option disables the redirect prop. Check the Save And Add Another section for more details.

resource

Components based on <Create> are often used as <Resource create> props, and therefore rendered when the URL matches /[resource]/create. The <Create> component generates a call to dataProvider.create() using the resource name from the URL by default.

You can decide to use a <Create> component in another path, or embedded in a page using another resource name (e.g. in a Dialog). In that case, you can explicitly set the resource name:

const PostCreate = () => (
    <Create resource="posts">
        ...
    </Create>
);

sx: CSS API

The <Create> components accept the usual className prop, but you can override many class names injected to the inner components by React-admin thanks to the sx property (as most MUI components, see their documentation about it). This property accepts the following keys:

Rule name Description
& .RaCreate-main Applied to the main container
& .RaCreate-noActions Applied to the main container when actions prop is false
& .RaCreate-card Applied to the child component inside the main container (MUI’s Card by default)

To override the style of all instances of <Create> components using the MUI style overrides, use the RaCreate key.

title

By default, the title for the Create view is “Create [resource_name]”.

You can customize this title by specifying a custom title prop:

export const PostCreate = () => (
    <Create title="New post">
        ...
    </Create>
);

The title value can be a string or a React element.

transform

To transform a record after the user has submitted the form but before the record is passed to dataProvider.create(), use the transform prop. It expects a function taking a record as argument, and returning a modified record. For instance, to add a computed field upon creation:

export const UserCreate = (props) => {
    const transform = data => ({
        ...data,
        fullName: `${data.firstName} ${data.lastName}`
    });
    return (
        <Create {...props} transform={transform}>
            ...
        </Create>
    );
}

The transform function can also return a Promise, which allows you to do all sorts of asynchronous calls (e.g. to the dataProvider) during the transformation.

Tip: If you want to have different transformations based on the button clicked by the user (e.g. if the creation form displays two submit buttons, one to “save”, and another to “save and notify other admins”), you can set the transform prop on the <SaveButton> component, too.

Changing The Notification Message

Once the dataProvider returns successfully after save, users see a generic notification (“Element created”). You can customize this message by passing a custom success side effect function in the mutationOptions prop:

import * as React from 'react';
import { useNotify, useRedirect, Create, SimpleForm } from 'react-admin';

const PostCreate = () => {
    const notify = useNotify();
    const redirect = useRedirect();

    const onSuccess = (data) => {
        notify(`Post created successfully`); // default message is 'ra.notification.created'
        redirect('edit', 'posts', data.id, data);
    };

    return (
        <Create mutationOptions={{ onSuccess }}>
            <SimpleForm>
                ...
            </SimpleForm>
        </Create>
    );
}

You can do the same for error notifications, by passing a custom onError callback.

Tip: The notification message will be translated.

Prefilling the Form

You sometimes need to pre-populate a record based on a related record. For instance, to create a comment related to an existing post.

By default, the <Create> view starts with an empty record. However, if the location object (injected by react-router-dom) contains a record in its state, the <Create> view uses that record instead of the empty object. That’s how the <CloneButton> works under the hood.

That means that if you want to create a link to a creation form, presetting some values, all you have to do is to set the location state. react-router-dom provides the <Link> component for that:

import * as React from 'react';
import { Datagrid } from 'react-admin';
import { Button } from '@mui/material';
import { Link } from 'react-router-dom';

const CreateRelatedCommentButton = ({ record }) => (
    <Button
        component={Link}
        to={{
            pathname: '/comments/create',
        }}
        state={{ record: { post_id: record.id } }}
    >
        Write a comment for that post
    </Button>
);

export default PostList = () => (
    <List>
        <Datagrid>
            ...
            <CreateRelatedCommentButton />
        </Datagrid>
    </List>
)

Tip: To style the button with the main color from the MUI theme, use the Link component from the react-admin package rather than the one from react-router-dom.

Tip: The <Create> component also watches the “source” parameter of location.search (the query string in the URL) in addition to location.state (a cross-page message hidden in the router memory). So the CreateRelatedCommentButton could also be written as:

import * as React from "react";
import Button from '@mui/material/Button';
import { Link } from 'react-router-dom';

const CreateRelatedCommentButton = ({ record }) => (
    <Button
        component={Link}
        to={{
            pathname: '/comments/create',
            search: `?source=${JSON.stringify({ post_id: record.id })}`,
        }}
    >
        Write a comment for that post
    </Button>
);

Should you use the location state or the location search? The latter modifies the URL, so it’s only necessary if you want to build cross-application links (e.g. from one admin to the other). In general, using the location state is a safe bet.

And if you want to prefill the form with constant values, use the defaultValues prop on the Form tag.

Tip: The <Clonebutton> component redirects to a Creation view prefilled with the same data as the current context. You can use it e.g. in a <Datagrid>, or in the <Edit actions> toolbar.

Save And Add Another

When users need to create several records in a row, a good UX is to stay on the Create form after a successfull submission, and to empty that form to allow a new entry.

Setting the <Create redirect={false}> prop only solves part of the problem: the form still needs to be emptied. That’s why the right implementation for this use case is to add a custom <SaveButton> in the form toolbar, making useof the mutationOptions prop:

import * as React from 'react';
import {
    Create,
    SaveButton,
    SimpleForm,
    Toolbar,
    useNotify,
} from 'react-admin';
import { useFormContext } from 'react-hook-form';

const PostCreateToolbar = () => {
    const notify = useNotify();
    const { reset } = useFormContext();

    return (
        <Toolbar>
            <SaveButton
                label="post.action.save_and_add"
                variant="text"
                mutationOptions={{
                    onSuccess: () => {
                        reset();
                        window.scrollTo(0, 0);
                        notify('ra.notification.created', {
                            type: 'info',
                            messageArgs: { smart_count: 1 },
                        });
                    },
                }}
            />
        </Toolbar>
    );
};

const PostCreate = () => {
    return (
        <Create>
            <SimpleForm toolbar={<PostCreateToolbar />}>
                ...
            </SimpleForm>
        </Create>
    );
}

You can also leave the choice to the user, by supplying two submit buttons: one with a redirect, and one with a form reset. The same technique applies: use the mutationOptions prop on the <SaveButton> component.