ra-core/dist/controller/input/useGetArrayInputNewItemDefaults.js

Core components of react-admin, a frontend Framework for building admin applications on top of REST services, using ES6, React

import { Children, isValidElement, useRef } from 'react';
import set from 'lodash/set.js';
import { FormDataConsumer } from "../../form/FormDataConsumer.js";
import { useEvent } from "../../util/index.js";
export const useGetArrayInputNewItemDefaults = (fields) => {
    const initialDefaultValue = useRef({});
    if (fields.length > 0) {
        const { id, ...rest } = fields[0];
        initialDefaultValue.current = rest;
        for (const k in initialDefaultValue.current)
            initialDefaultValue.current[k] = null;
    }
    return useEvent((inputs) => {
        if (Children.count(inputs) === 1 &&
            isValidElement(Children.only(inputs)) &&
            // @ts-ignore
            !Children.only(inputs).props.source &&
            // Make sure it's not a FormDataConsumer
            // @ts-ignore
            Children.only(inputs).type !== FormDataConsumer) {
            // ArrayInput used for an array of scalar values
            // (e.g. tags: ['foo', 'bar'])
            return '';
        }
        // ArrayInput used for an array of objects
        // (e.g. authors: [{ firstName: 'John', lastName: 'Doe' }, { firstName: 'Jane', lastName: 'Doe' }])
        const defaultValue = { ...initialDefaultValue.current };
        Children.forEach(inputs, input => {
            if (isValidElement(input) &&
                input.type !== FormDataConsumer &&
                input.props.source) {
                set(defaultValue, input.props.source, input.props.defaultValue ?? null);
            }
        });
        return defaultValue;
    });
};
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