React + Redux Update issue - reactjs

Question

I have this class:
import React from 'react';
import {Link} from 'react-router';
import '../../styles/about-page.css';
import Item from './Item';
// Redux
import { connect } from 'react-redux';
import actions from '../../redux/actions';
import { bindActionCreators } from 'redux';
// Auth
import Auth from '../../modules/Auth';
import User from '../../constants';
class CommentForm extends React.Component {
constructor(props) {
super(props);
this.state = {
value: ''
};
}
handleChange(event) {
this.setState({value: event.target.value});
}
handleSubmit() {
// alert('A name was submitted: ' + this.state.value);
this.props.onFinish({
name: this.props.user.name,
userId: this.props.user.id,
comment: this.state.value
});
}
render() {
if (!this.props.user || !this.props.user.name) return <div/>;
return (<div className="item">
{this.props.user.name}:
<label style={{width: '60%', margin: '10px'}}>
<input style={{width: '100%'}} type="text" value={this.state.value} onChange={this.handleChange.bind(this)} />
</label>
<input style={{width: '16%', display: 'inline-block', margin: '10px'}} type="submit" value="Enviar" onClick={this.handleSubmit.bind(this)}/>
</div>
);
}
}
#connect((state) => state)
class ItemPage extends React.Component {
constructor(props) {
super(props);
this.state = {
user: null,
pret: null
};
}
componentWillMount() {
let self = this;
this.props.actions.getPret(this.props.routeParams.id).then(function(a) {
self.setState({
pret: self.props.pret
})
});
if (Auth.isUserAuthenticated()) {
User.getBearer(Auth, function(info) {
self.setState({user: info});
});
}
}
onFinish(comment) {
//changing the state in react
//need to add '6' in the array
//create a copy of this.state.a
//you can use ES6's destructuring or loadash's _.clone()
const currentStatePretCopy = Object.assign({}, this.state.pret, { b: this.state.pret.comments.concat([comment])})
console.log(1, currentStatePretCopy);
currentStatePretCopy.comments.push(comment);
this.props.actions.updatePret(currentStatePretCopy);
}
render() {
let self = this;
if (!this.state || !this.state.pret) return <div/>;
return (<div>
<section>
<Item full={true} user={this.state.user} item={this.state.pret} actions={this.state.actions}/>
</section>
<div>
<CommentForm user={this.state.user} pret={this.state.pret} onFinish={this.onFinish.bind(this)}/>
{/* TODO: ad here */}
{this.state.pret.comments && this.state.pret.comments.length ? this.state.pret.comments.map(function (comment, index) {
return (<div className="item" key={index}> by <Link to={'/user/' + comment.userId}> #{comment.name} </Link> : {comment.comment} </div>);
}) : null}
</div>
</div>
);
}
}
function mapStateToProps (state) {
return {
pret: state.prets[0]
};
}
function mapDispatchToProps (dispatch) {
return {
actions: bindActionCreators(actions, dispatch)
};
}
export default connect(
mapStateToProps,
mapDispatchToProps
)(ItemPage);
When i want to update the object, since props should be immutable, the documentation suggest cloning the object and put it in the state.
I am modifying the state with the new value and sending it to Redux actions but the system complains:
Uncaught Error: A state mutation was detected between dispatches, in the path 'prets.0.comments.1'. This may cause incorrect behavior.
Since i copy the object I do not know how should I update the store via React+Redux

Answer 1

The comments array is still the original one. So you are mutating the original object with push.
Replace
currentStatePretCopy.comments.push(comment);
With
currentStatePretCopy.comments = currentStatePretCopy.comments.concat([comment])
And everything should work fine