React Native redux reducers 推送数组的最佳方式 [英] React Native redux reducers best way to push array

问题描述

我有以下状态和减速器，但它没有推入新的数组对象.

I have the following state and reducer but it's not pushing in the new array object.

const initialState = {
    photos: [],
    selectedPhoto:{},
    photosTeamId:'',
    photosProjectId:''
};

case actionTypes.PHOTOS_UPDATE:
            return Object.assign({}, state, {
                photos:action.data.photos,
                photosTeamId:action.data.photosTeamId,
                photosProjectId:action.data.photosProjectId
            })

照片没有被推送而是被覆盖

photos is not getting pushed but overwritten

推荐答案

这是使用 javascript 传播语法:

Here's a more cleaner way using javascript spread syntax:

const initialState = {
    photos: [],
    selectedPhoto:{},
    photosTeamId:'',
    photosProjectId:''
};

case actionTypes.PHOTOS_UPDATE:
            return {
                ...state,
                photos: [...state.photos, ...actions.data.photos],
                photosTeamId: action.data.photosTeamId,
                photosProjectId: action.data.photosProjectId
            }

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