Dynamically load initialValues in Redux Form

Question

Using the example of initializingFromState within Redux-Form, I am trying to set this up dynamically. This is to edit a particular book in a list of books, and is using a simple api set up in express.js.

The full container is below. I somehow need to pass in initialValues, within the mapStateToProps function. In the example, it is done via a static object, but I can't work out how to use the information I have pulled in via fetchBook, and pass it to initialValues.

Container:

import React, { Component, PropTypes } from 'react';
import { reduxForm } from 'redux-form';
import { connect } from 'react-redux';
import { Link } from 'react-router';
import { fetchBook, editBook } from '../actions/index';

class BookEdit extends Component {

  componentWillMount() {
      this.props.fetchBook(this.props.params.id);
  }

    static contextTypes = {
    router: PropTypes.object
    }

  onSubmit(props) {
    this.props.editBook(this.props.book.id, props)
      .then(() => {
        this.context.router.push('/');
      });
  }

    const data = {
        title: {this.props.book.title},
        description: {this.props.author}
    }

  render() {

    const { fields: { title, author }, handleSubmit } = this.props;
    const { book } = this.props;

    if (!book) {
      return (
          <div>
            <p>Loading...</p>
          </div>
      )
    }

    return (
      <div>
      <Link to="/">Back</Link>
        <form onSubmit={handleSubmit(this.onSubmit.bind(this))}>
                <h2>Add a new book</h2>

                <label>Title</label>
                <input type="text" {...title} />
                <div className="text-help">{title.touched ? title.error : ''}</div>

                <label>Author</label>
                <input type="text" {...author} />
                <div className="text-help">{author.touched ? author.error : ''}</div>

                <button type="submit">Add</button>
                <Link to="/" className="button">Go back</Link>
            </form>
      </div>
    );
  }
}

function mapStateToProps(state) {
  return {
      book: state.books.book,
      initialValues: // how do I pass in the books here?
  };
}

export default reduxForm({
  form: 'EditBookForm',
  fields: ['title', 'author']
}, mapStateToProps, { fetchBook, editBook })(BookEdit);

Thank you.

Answer 1

Your form values aren't what's in state.books.book? I think this is all you're looking for:

function mapStateToProps(state) {
  return {
      book: state.books.book,
      initialValues: state.books.book
  };
}

Since you're only really looking at this.props.book to know if it's loaded or not, it might be more explicit to do something like:

function mapStateToProps(state) {
  return {
      loaded: !!state.books.book,
      initialValues: state.books.book
  };
}

Hope that helps.