useSourceContext

When using an <ArrayInput>, the name under which an input is registered in a <Form> is dynamically generated depending on the index of the item in the array.

To get the name of the input for a given index, you can leverage the SourceContext created by ra-core, which can be accessed using the useSourceContext hook.

You can then leverage react-hook-form’s setValue method to change an item’s value programmatically.

import { useSourceContext } from 'ra-core';
import { useFormContext } from 'react-hook-form';
import {
    ArrayInput,
    Button,
    SimpleFormIterator,
    TextInput,
} from 'your-ra-ui-library';

const MakeAdminButton = () => {
    const sourceContext = useSourceContext();
    const { setValue } = useFormContext();

    const onClick = () => {
        // sourceContext.getSource('role') will for instance return
        // 'users.0.role'
        setValue(sourceContext.getSource('role'), 'admin');
    };

    return (
        <Button onClick={onClick} size="small" sx={{ minWidth: 120 }}>
            Make admin
        </Button>
    );
};

const UserArray = () => (
    <ArrayInput source="users">
        <SimpleFormIterator inline>
            <TextInput source="name" helperText={false} />
            <TextInput source="role" helperText={false} />
            <MakeAdminButton />
        </SimpleFormIterator>
    </ArrayInput>
);

Hook Value

Name	Type	Description
getSource	function	A function that returns the name of the input for the given source
getLabel	function	A function that returns the label of the input for the given source

getSource

The getSource function returns the name of a source withing a SourceContext.

export function MyCustomInput({ source }: MyCustomInputProps) {
    const sourceContext = useSourceContext();
    const name = sourceContext.getSource(source);

    return /* ... */;
}

export type MyCustomInputProps = {
    source: string;
};

getLabel

The getLabel function returns the label of a source withing a SourceContext.

export function MyCustomInput({ source }: MyCustomInputProps) {
    const sourceContext = useSourceContext();
    const label = sourceContext.getLabel(source);

    return /* ... */;
}

export type MyCustomInputProps = {
    source: string;
};