Schedule.js

import 'moment/locale/hu';

import {
  Accordion,
  Container,
  Grid,
  Header,
  Icon,
  Segment,
} from 'semantic-ui-react';
import React, { Component } from 'react';

import { connect } from 'react-redux';
import { getStudentEvents } from '../../actions/statistics';
import moment from 'moment';

class Schedule extends Component {
  // eslint-disable-next-line react/state-in-constructor
  state = { activeIndex: 0 };

  UNSAFE_componentWillMount() {
    this.props.getStudentEvents();
  }

  handleClick = (e, titleProps) => {
    const { index } = titleProps;
    const { activeIndex } = this.state;
    const newIndex = activeIndex === index ? -1 : index;

    this.setState({ activeIndex: newIndex });
  };

  render() {
    const { activeIndex } = this.state;

    const { events } = this.props;
    const panels = events.map((event) => (
      <Accordion key={Math.random()}>
        <Accordion.Title
          active={activeIndex === event.id}
          index={event.id}
          onClick={this.handleClick}
        >
          <h2>
            <Grid>
              <Grid.Column floated="left" width={5} textAlign="left">
                <Icon name="calendar alternate outline" color="blue" />{' '}
                {event.name}
              </Grid.Column>
              <Grid.Column floated="right" width={8} textAlign="right">
                {moment(event.date).locale('hu').format('LLLL')}
              </Grid.Column>
            </Grid>
          </h2>
        </Accordion.Title>
        <Accordion.Content active={activeIndex === event.id}>
          <Segment textAlign="left" style={{ overflowWrap: 'break-word' }}>
            {event.description}
          </Segment>
        </Accordion.Content>
      </Accordion>
    ));

    return (
      <div>
        <Container textAlign="center">
          <Header
            as="h1"
            content="Képzés alkalmak"
            style={{
              fontSize: '2em',
              fontWeight: 'bold',
              marginBottom: '0.5em',
              marginTop: '0.5em',
            }}
          />
          <Accordion fluid styled>
            {panels}
          </Accordion>
          <Header
            as="h1"
            content="Tábor"
            style={{
              fontSize: '2em',
              fontWeight: 'bold',
              marginBottom: '0.5em',
              marginTop: '1.5em',
            }}
          />
        </Container>
      </div>
    );
  }
}

const mapStateToProps = ({ events: { events }, user }) => ({ events, user });

export default connect(mapStateToProps, { getStudentEvents })(Schedule);