trc-client-core/src/course/CourseParticipationReducer.js

The core of the TRC Client

import {
    COURSE_PARTICIPATION_FETCH,
    COURSE_PARTICIPATION_RECEIVE,
    COURSE_PARTICIPATION_ERROR
} from 'trc-client-core/src/constants/ActionTypes';

import {Map} from 'immutable';

const initialState = Map({
    fetching: false
});

export default function courseParticipation(state = initialState, action) {
    switch (action.type) {
        case COURSE_PARTICIPATION_FETCH:
            return state
                .set('fetching', true);

        case COURSE_PARTICIPATION_RECEIVE:
            return state
                .merge(action.payload)
                .set('fetching', false);

        case COURSE_PARTICIPATION_ERROR:
            return state
                .set('fetching', false)
                .set('error', action.payload);

        default: 
            return state;
    }
}