Why mapStateToProps return empty object when state has been mutated?

Question

I create action

export const KIDS_LOAD = 'KIDS_LOAD';
export const kidsLoad = (data) => ({
    type: KIDS_LOAD,
    payload: data ,
});

I create reducer

import { KIDS_LOAD } from '../customActions/KidsActions';

export default (state = {}, { type, payload }) => {
    if (type === KIDS_LOAD) {
                return {    ...state,   
                    img: payload.img,
                    kidsInfo: payload.kidsInfo
                };
    }
    return state;
}

I dispatch action

componentWillMount() {
                this.props.setSidebarVisibility(true);
                const { kidsLoad, record } = this.props;

                kidsLoad({
                    img : 'https://s18670.pcdn.co/wp-content/uploads/care_about_grades_middle_school.jpg',
                    kidsInfo: {
                        kidName : 'Sasha',
                        kidAge : '19',
                        kidHandType : 'Right',
                        kidGender : 'Boy', 
                    }
                })

                console.log( this.props.kidsTabData)

        }

I map state

const mapStateToProps = state => ({
        kidsTabData: state.kidsReducer,
        isLoading: state.admin.loading > 0,
    });
export default connect(mapStateToProps, { setSidebarVisibility, kidsLoad })(withStyles(styles)(MyLayout));

Store mutated

But console.log( this.props.kidsTabData) return empty object {}.

Can you tell where I’m wrong? It seems to me that everything goes to the store correctly, but the initialState gets to props.

oisti oisti · Accepted Answer · 2019-02-10T17:51:40

The redux action kidsLoad is asynchronous. Try the console.log in componentDidUpdate

componentDidUpdate(){
    console.log(this.props.kidsTabData)
}

Why mapStateToProps return empty object when state has been mutated?

1 Answers