application/redux/reducers/user-reducers.js

import _ from 'lodash';
import Immutable from 'immutable';
import {
    USERS_REQUEST,
    USERS_RECEIVE,
    USERS_RECEIVE_PAGINATION,
    USER_RECEIVE,
    USERS_INVALIDATE,
    USER_SELECTED,
    USERS_SET_PAGE
} from './../actions/user-actions';

const PER_PAGE = 20;

export function users(state = null, action) {
    if (state === null) {
        state = {
            isFetching: false,
            didInvalidate: false,
            items: Immutable.fromJS({}),
            selected: false,
            page: 0,
            pagination: {
                before: 0,
                current: 0,
                first: 0,
                last: 0,
                limit: 0,
                next: 0,
                total_items: 0,
                total_pages: 0
            },
            order: "name",
            dir: "asc",
            filter: false
        };
    }

    let newState;

    switch (action.type) {
        case USERS_RECEIVE_PAGINATION:
            return Object.assign({}, state, {
                pagination: {
                    'before': action.payload.before,
                    'current': action.payload.current,
                    'first': action.payload.first,
                    'last': action.payload.last,
                    'limit': action.payload.limit,
                    'next': action.payload.next,
                    'total_items': action.payload.total_items,
                    'total_pages': action.payload.total_pages,
                }
            });
        case USERS_INVALIDATE:
            return Object.assign({}, state, {
                didInvalidate: true,
            });
        case USERS_REQUEST:
            return Object.assign({}, state, {
                isFetching: true,
                didInvalidate: false
            });
        case USER_SELECTED: {
            return Object.assign({}, state, {
                selected: action.payload.selected
            });
        }
        case USER_RECEIVE:
            const user = action.payload.user;
            let found = false;
            const users = state.items.map((item, i) => {
                if (item.get('uuid') == user.get('uuid')) {
                    found = true;
                    return user;
                }
                return item;
            });

            if (!found) {
                users.push(user);
            }
            action.payload.users = Immutable.fromJS(users);
        case USERS_RECEIVE:
            return Object.assign({}, state, {
                isFetching: false,
                didInvalidate: false,
                items: action.payload.users
            });
    }

    return state;
};