[英]Update the redux state in the reducer having array of objects
I am new to the react-redux. 我是React Redux的新手。
I do have an object which is like, 我确实有一个像
const initialState = {
Low: [
{
id: 0,
technologyId: 0,
technology: '',
level: 'EASY'
}
],
Medium: [
{
id: 0,
technologyId: 0,
technology: '',
level: 'MEDIUM'
}
],
High: [
{
id: 0,
technologyId: 0,
technology: '',
level: 'TOUGH'
}
]
}
Now,
export default function QuizData(state = initialState, action) {
switch (action.type) {
case QUIZ_DATA:
return {
...state,
Low: action.data,
error: false,
}
case RESET_SETUP_QUIZ: {
console.log("intial state is ", ...state);
return {
...state
}
Now, here what happens is after some manipulations, this objects gets changes with every key is having some values. 现在,这里发生的是经过一些操作后,此对象随每个键具有一些值而发生变化。 like,
喜欢,
{
Low: [
{
id: 0,
technologyId: 11,
technology: 'xsxs',
level: 'EASY'
}
],
Medium: [
{
id: 0,
technologyId: 22,
technology: 'swwsw',
level: 'MEDIUM'
}
],
High: [
{
id: 0,
technologyId: 110,
technology: 'xsxsx',
level: 'TOUGH'
}
]
}
So, This gets changed.Now, what I want to do is that , 所以,这变了。现在,我想做的是,
When user clicks a button that time I want to change this to the initial state. 当用户单击按钮时,我想将其更改为初始状态。
So that it will not have any values as it should be same as by default. 这样就不会有任何值,因为它应该与默认值相同。
SO, what I tried it 所以,我尝试了什么
return {
initalState
}
But here, initial state is also having the same values. 但是在这里,初始状态也具有相同的值。
So, I am not getting a way to make it to the initial level. 因此,我没有办法使它达到初始水平。
Can one help me with this ? 有人可以帮我吗?
Because you use the original state object and return a modified version of it (ie you do affect your initialState). 因为您使用原始状态对象并返回它的修改版本(即,您确实会影响您的initialState)。
You must create a copy of the state in your reducer, for example 您必须在化简器中创建状态的副本,例如
case QUIZ_DATA:
return Object.assign(
{},
state,
{
Low: action.data,
error: false
}
)
case RESET_SETUP_QUIZ: {
return Object.assign(
{},
state
)
}
You have dedicated librairies like immutablejs to handle this ( https://redux.js.org/recipes/usingimmutablejs ) 您可以使用诸如immutablejs之类的专用库来处理此问题( https://redux.js.org/recipes/usingimmutablejs )
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