我正在开发一个本机(本地)事件应用程序,我遇到了一个问题,我的模拟事件的ID会被更新,因为他们不应该只是在#39 ;重新整数,当id是字符串时我没有这个问题。
基本流程是我显示事件列表,当用户按下该事件时,他们将被带到该事件视图。我通过使用 eventInFocus 和事件* reducers并在** eventView 容器中查找我需要的事件来完成此操作。
当我按下某个特定事件时,所有事件ID都会更新并且难以调试,因为它声明前一个状态已经有混合ID,这非常令人困惑,因为渲染项目中没有任何问题主视图(循环遍历数组,使用id作为键)。 如果我选择第一个事件,我会收到一个错误,即无法找到该事件,如果我选择其他2个事件中的任何一个,则会随机更新事件ID。
事件减少器
const defaultEvents = [{
id: 0,
name: 'my birthday',
date: new Date(),
repeatAnnually: false,
wallPaperSource: null
},{
id: 1,
name: 'yosemite trip',
date: new Date(),
repeatAnnually: true,
wallPaperSource: null
}, {
id: 2,
name: 'trip to dublin',
date: new Date(),
repeatAnnually: false,
wallPaperSource: null
}];
const event = (state, action) => {
switch (action.type) {
case EVENT_EDITED:
if(state.id !== action.event.id){
return state;
}
return action.event;
default:
return state;
}
}
function events(state = defaultEvents, action){
switch(action.type){
case ADD_EVENT:
return [
...state,
{
id: action.event.id,
name: action.event.name,
date: action.event.date,
repeatAnnually: action.event.repeatAnnually,
wallPaperSource: action.event.wallPaperSource || null
}];
case EVENT_EDITED:
return state.map(e =>
event(e, action)
)
default:
return state;
}
}
eventInFocus reducer
function eventInFocus(state = {}, action){
switch(action.type){
case "UPDATE_EVENT_IN_FOCUS":
return Object.assign({}, state, action.event);
case VIEW_EVENT:
return Object.assign({}, action.event);
default:
return state;
}
}
eventContainer - 列表中每个项目周围的容器(主视图)
const mapStateToProps = (state, ownProps) => {
return {
ownProps
}
}
const mapDispatchToProps = (dispatch, ownProps) => {
return {
onPress: (event)=> {
dispatch(viewEvent(event));
}
}
}
viewEventContainer - 适用于单个事件视图
const mapStateToProps = (state, ownProps) => {
const {events, eventInFocus } = state;
viewEvent = find(events, e => e.id = eventInFocus.id);
return {
event: viewEvent,
ownProps
}
}
const mapDispatchToProps = (dispatch, state) => {
return {
onEditEvent: (event) => {
dispatch(editEvent(event));
}
}
}
const EventViewContainer = connect(
mapStateToProps,
mapDispatchToProps
)(EventView);
viewEvent action
export const viewEvent = (event) => {
return {
type: VIEW_EVENT,
event
}
}
对于redux,我有什么遗漏吗?我的减速机结构不合理吗?令我困惑的部分是为什么它只发生整数而不是字符串。提前谢谢!
答案 0 :(得分:1)
以下是代码中包含错误的行:
viewEvent = find(events, e => e.id = eventInFocus.id);
^
here
正如您所看到的,state
每次调用mapStateToProps
时都会发生变异。