Redux form editing HOC

FormContentsContainer.jsx

import React, {Component} from 'react';
import {bindActionCreators} from "redux"
import { connect }            from 'react-redux';
import {schema, getModelByType} from "models/models"

import SomeFormComponent from "SomeFormComponent"

import {selectedItemSelector, isEditingSelector} from "selectors/entities"

let mapStateToProps = (state) => {
  let selectedItem = selectedItemSelector(state);
  let isEditing = isEditingSelector(state);
  let name = "Unknown";
  let type = "N/A";
  let item;

  if(selectedItem) {
    let {itemID, itemType} = selectedItem;
    let entities = isEditing ? state.selection.editingEntities : state.entities;

    let session = schema.from(entities);
    let model = getModelByType(session, itemID, itemType);
    name = model.name;
    type = itemType;
    item = model.toJSON();
  }

  return {name, type, item, isEditing};
}

const mapDispatchToProps = (dispatch) => ({
  actions : bindActionCreators({editItem, stopEditing}, dispatch)
})


// Do useful stuff with either the current selected item, 
// or the "work-in-progress editing" version of the item

class FormContentsContainer extends Component {
  render() {
    let {type, item, isEditing} = this.props;
    
    return (
        <FormEditWrapper value={item} isEditing={isEditing}>
          <SomeFormComponent />
        </FormEditWrapper>
    );
    
  }

FormEditWrapper.jsx

import React, {Component, PropTypes} from "react";

import {noop, debounce, defaults, values} from "lodash";

export function getValueFromEvent(e) {
    const {target} = e;

    let newValues;

    if(target) {
        const value = (target.type === "checkbox") ? target.checked : target.value;
        newValues = {
            [target.name] : value,
        };
    }
    else if(isObject(e)) {
        newValues = e;
    }

    return newValues;
}

class FormEditWrapper extends Component {
    static propTypes = {
        value : PropTypes.object.isRequired,
        isEditing : PropTypes.bool,
        onChange : PropTypes.func,
        valuePropName : PropTypes.string,
        onChangePropName : PropTypes.string,
        singleValue : PropTypes.bool,
        passIsEditing : PropTypes.bool,
    }
    
    static defaultProps = {
        isEditing : true,
        onChange : noop,
        valuePropName : "value",
        onChangePropName : "onChange",
        singleValue : false,
        passIsEditing : true,
    }

    constructor(props) {
        super(props);
        const boundDispatchAttributes = this.dispatchAttributeChange.bind(this);
        this.dispatchAttributeChange = debounce(boundDispatchAttributes, 250);

        this.state = {
            value : {},
        };
    }

    componentWillReceiveProps() {
        // Reset any component-local changes  Note that the incoming props
        // SHOULD match the changes we just had in local state.
        this.setState({value : {}});
    }

    onChildChange = (e) => {
        const {isEditing} = this.props;

        if(isEditing) {
            const newValues = getValueFromEvent(e);

            if(newValues) {
                const change = {
                    ...this.state.value,
                    ...newValues
                };

                // Update our component-local state with these changes, so that the child components
                // will re-render with the new values right away
                this.setState({value : change});

                // Because this is debounced, we will only update the app WIP/editing state
                // once there is a pause in changes (like letting go of a held-down key)
                this.dispatchAttributeChange(change);
            }
        }
    }

    dispatchAttributeChange(change) {
        this.props.onChange(change);
    }

    render() {
        const {value : propsValue, children} = this.props;
        const {isEditing, passIsEditing, valuePropName, onChangePropName, singleValue} = this.props;
        const {value : stateValue = {}} = this.state;

        // Use incoming values from props IF there is no corresponding value
        // in local component state.  This allows local changes to win out.
        const currentValues = defaults({}, stateValue, propsValue);

        let valueToPassDown = currentValues;

        if(singleValue) {
            valueToPassDown = values(currentValues)[0];
        }

        const editingValue = passIsEditing ? {isEditing} : {};

        // Force the child form to re-render itself with these values
        const child = React.Children.only(children);

        const updatedChild = React.cloneElement(child, {
            [valuePropName] : valueToPassDown,
            [onChangePropName] : this.onChildChange,
            ...editingValue
        });

        return updatedChild;
    }
}

export default FormEditWrapper;

selectedItem.js

import {EDIT_ITEM_ATTRIBUTES} from 'constants/selectedItem';
import {selectedItemSelector, isEditingSelector} from "selectors/entities"

export let editItemAttributes = (newAttributes) => (dispatch, getState) => {
  let state = getState();
  let isEditing = isEditingSelector(state);
  let selectedItem = selectedItemSelector(state);

  if(!!selectedItem && isEditing) {
    dispatch({type : EDIT_ITEM_ATTRIBUTES, payload : newAttributes});
  }
};

On unmount, the last state should be dispatched to the app without debouncing.

Hmm. Good point. Thanks. Granted, in the app I'm prototyping, this would probably be in place permanently, but worth noting.