application/redux/reducers/tag-reducers.js

import _ from 'lodash';
import Immutable from 'immutable';
import {
    TAGS_REQUEST,
    TAGS_RECEIVE,
    TAGS_RECEIVE_PAGINATION,
    TAG_RECEIVE,
    TAGS_INVALIDATE,
    TAG_SELECTED,
    TAGS_SET_PAGE
} from './../actions/tag-actions';

const PER_PAGE = 20;

export function tags(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 TAGS_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 TAGS_INVALIDATE:
            return Object.assign({}, state, {
                didInvalidate: true,
            });
        case TAGS_REQUEST:
            return Object.assign({}, state, {
                isFetching: true,
                didInvalidate: false
            });
        case TAG_SELECTED: {
            return Object.assign({}, state, {
                selected: action.payload.selected
            });
        }
        case TAG_RECEIVE:
            const tag = action.payload.tag;
            let found = false;
            const allTags = state.items.map((item, i) => {
                if (item.get('uuid') == tag.get('uuid')) {
                    found = true;
                    return tag;
                }
                return item;
            });

            if (!found) {
                let temp = allTags.toList().asMutable();
                temp.push(tag);
                action.payload.tags = temp.asMutable();
            } else {
                action.payload.tags = allTags;
            }
        case TAGS_RECEIVE:
            return Object.assign({}, state, {
                isFetching: false,
                didInvalidate: false,
                items: action.payload.tags
            });
    }

    return state;
};