javascript - 我想以不可变的方式更新状态对象,以便 react 和 redux 能够正常工作?
问题描述
我想以不可变的方式在我的 redux reducer 状态下更新给定 javascript 对象中每个用户的 firstName
我尝试了很多方法,但没有一个有效。
这是我的数据:
{"users":[{"key":1,"value":{"employeeID":1,"firstName":"Siddharth Kilam","mobileNumber":"+919987792049","adminName":"Sid Kilam","adminID":36,"profileName":"default","profileID":4,"explicitLogin":1,"locRow":{"timestamp":"2019-04-09 09:15:05","lat":28.4453983,"lon":77.1012133,"eventTypeID":9,"employeeID":1},"attendanceRow":{"timestamp":"2019-04-09 09:05:39","lat":28.4453983,"lon":77.1012133,"eventTypeID":8,"employeeID":1},"workingStatus":{"code":0,"reason":"Normal Day","shifts":[{"startTime":"2019-04-11T04:34:00.000Z","endTime":"2019-04-11T12:34:00.000Z"}]},"offlinePeriod":3600000,"status":"Inactive"}},{"key":145,"value":{"employeeID":145,"firstName":"SidKilam2 Motorola","mobileNumber":"9599936991","adminName":"Sid Kilam","adminID":36,"profileName":"default","profileID":4,"explicitLogin":1,"locRow":{"timestamp":"2019-04-03 12:20:16","lat":28.4455203,"lon":77.101336,"eventTypeID":9,"employeeID":145},"attendanceRow":{"timestamp":"2019-04-02 23:01:27","lat":28.4747009,"lon":77.0989274,"eventTypeID":9,"employeeID":145},"workingStatus":{"code":0,"reason":"Normal Day","shifts":[{"startTime":"1999-12-31T18:30:00.000Z","endTime":"2000-01-01T18:29:59.000Z"}]},"offlinePeriod":3600000,"status":"Offline"}}]};
My Current Reducer Function :
const newState = {
...state, // or state
users: state.users.filter(user => {
return user.value.status === online;
})
}
return newState;
解决方案
您还需要传播用户对象以保持不变性,如下所示:
const newState = {
...state,
users: ([...state.users].filter(user => {
return user.value.status === online;
})).map(user => ({...user, value: {...user.value, firstName:"Vishal"}}));
}