app/reducers/postReducer.jsx

let uuid = require('uuid');
import moment from 'moment';
import _ from 'lodash';

// - Import action types
import * as types from 'actionTypes';

// Default State
let defaultState = {
    userPosts: {},
    loaded: false
};

/**
 * Post reducer
 * @param {object} state 
 * @param {object} action 
 */
export let postReducer = (state = defaultState, action) => {
    const { payload } = action;
    switch (action.type) {
        case types.CLEAR_ALL_DATA_POST:
            return defaultState;
        case types.ADD_IMAGE_POST:
            return {
                ...state,
                userPosts: {
                    ...state.userPosts,
                    [payload.uid]: {
                        ...state.userPosts[payload.uid],
                        [payload.post.id]: { ...payload.post }
                    }
                }
            };
        case types.ADD_POST:
            return {
                ...state,
                userPosts: {
                    ...state.userPosts,
                    [payload.uid]: {
                        ...state.userPosts[payload.uid],
                        [payload.post.id]: { ...payload.post }
                    }
                }
            };
        case types.UPDATE_POST:
            return {
                ...state,
                userPosts: {
                    ...state.userPosts,
                    [payload.uid]: {
                        ...state.userPosts[payload.uid],
                        [payload.post.id]: {
                            ...state.userPosts[payload.uid][payload.post.id],
                            ...payload.post
                        }
                    }
                }
            };
        case types.DELETE_POST:
            let filteredPosts = {};

            Object.keys(state.userPosts[payload.uid]).map((key) => {
                if (key !== payload.id) {
                    return _.merge(filteredPosts, { [key]: { ...state.userPosts[payload.uid][key] } });
                }
            });

            return {
                ...state,
                userPosts: {
                    ...state.userPosts,
                    [payload.uid]: {
                        ...filteredPosts
                    }
                }
            };
        case types.ADD_LIST_POST:
            return {
                ...state,
                userPosts: {
                    ...state.userPosts,
                    [payload.uid]: {
                        ...state.userPosts[payload.uid],
                        ...payload.posts
                    }
                },
                loaded: true
            };
        default:
            return state;
    }
}