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é«æ¬¡ã®ã¬ãã¥ãŒãµãŒãšé«æ¬¡ã®ã³ã³ããŒãã³ããäœæããå¿
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é«éã¬ãã¥ãŒãµãŒã«ã€ããŠã¯ããã¡ãã®ã¢ãããŒããåç §ããŠãã ããã
function list(reducer, actionTypes) {
return function (state = [], action) {
switch (action.type) {
case actionTypes.add:
return [...state, reducer(undefined, action)];
case actionTypes.remove:
return [...state.slice(0, action.index), ...state.slice(action.index + 1)];
default:
const { index, ...rest } = action;
if (typeof index !== 'undefined') {
return state.map(item => reducer(item, rest));
}
return state;
}
}
}
function counter(state = 0, action) {
switch (action.type) {
case 'INCREMENT':
return counter + 1;
case 'DECREMENT':
return counter - 1;
}
}
const listOfCounters = list(counter, {
add: 'ADD_COUNTER',
remove: 'REMOVE_COUNTER'
});
const store = createStore(listOfCounters);
store.dispatch({
type: 'ADD_COUNTER'
});
store.dispatch({
type: 'ADD_COUNTER'
});
store.dispatch({
type: 'INCREMENT',
index: 0
});
store.dispatch({
type: 'INCREMENT',
index: 1
});
store.dispatch({
type: 'REMOVE_COUNTER',
index: 0
});
ïŒç§ã¯ãããå®è¡ããŠããŸããããæå°éã®å€æŽã§åäœããã¯ãã§ããïŒ
ããããšã-ç§ã¯ãã®ã¢ãããŒããæ©èœãããããã«åªããŸãã
combineReducers
ãä»ããŠãªã¹ãæ©èœãåå©çšããŠãã«ãŠã³ã¿ãŒã®ãªã¹ããšToDoã¢ã€ãã ã®ãªã¹ãã®äž¡æ¹ãååŸã§ãããã©ããã¯ãŸã çåã§ãã ãããŠãããçã«ããªã£ãŠãããªãã ããããç§ã¯ééããªããããè©ŠããŠã¿ãŸãã
CombineReducersãä»ããŠãªã¹ãæ©èœãåå©çšããŠãã«ãŠã³ã¿ãŒã®ãªã¹ããšToDoã¢ã€ãã ã®ãªã¹ãã®äž¡æ¹ãäœæã§ãããã©ããã¯ãŸã çåã§ãã ãããŠãããçã«ããªã£ãŠãããªãã ããããç§ã¯ééããªããããè©ŠããŠã¿ãŸãã
ã¯ããå®å šã«ïŒ
const reducer = combineReducers({
counterList: list(counter, {
add: 'ADD_COUNTER',
remove: 'REMOVE_COUNTER'
}),
todoList: list(counter, {
add: 'ADD_TODO',
remove: 'REMOVE_TODO'
}),
});
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ç§ãã¡ã¯ããªãã®æ瀺ã§é«æ¬¡ã®ã¬ãã¥ãŒãµãŒãäœæããããšãã§ããŸããããé«æ¬¡ã®ã³ã³ããŒãã³ãã«èŠåŽããŠããŸãã çŸåšãç§ãã¡ã®ã³ã³ããŒãã³ãã¯ãCounter以å€ã®ã³ã³ããŒãã³ãã§äœ¿çšã§ããã»ã©æ±çšçã§ã¯ãããŸããã ç§ãã¡ã®åé¡ã¯ãäžè¬çãªæ¹æ³ã§ã¢ã¯ã·ã§ã³ã«ã€ã³ããã¯ã¹ãè¿œå ããæ¹æ³ã§ãã
ããã§ç§ãã¡ã®ãœãªã¥ãŒã·ã§ã³ãèŠãããšãã§ããŸãïŒ https ïŒ//github.com/Zeikko/redux/commit/6a222885c8c93950dbdd0d4cf3532cd99a32206c
åé¡ã®ããéšåã匷調ããããã«ãã³ãããã«ã³ã¡ã³ããè¿œå ããŸããã
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çŸåšãç§ãã¡ã®ã³ã³ããŒãã³ãã¯ãCounter以å€ã®ã³ã³ããŒãã³ãã§äœ¿çšã§ããã»ã©æ±çšçã§ã¯ãããŸããã ç§ãã¡ã®åé¡ã¯ãäžè¬çãªæ¹æ³ã§ã¢ã¯ã·ã§ã³ã«ã€ã³ããã¯ã¹ãè¿œå ããæ¹æ³ã§ãã
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ç§ã¯ããªããä»æå³ããããšãç解ããŠãããšæããŸãã
ç³ãèš³ãããŸããããä»ã¯ããŸãã³ã¡ã³ãã§ããŸããã ææ¥ãŸãæ»ããŸãã
ç§ã¯ä»åé¡ãç解ããŠããŸãã ããã調ã¹ãŸãã
ReduxãElmã¢ãŒããã¯ãã£ããã©ã®ããã«éžè±ãããã«åºæã®ããã€ãã®å¶éã«ããã«ã¶ã€ãããŸããã
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dispatch
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èŠããããŸãã ã€ãŸããã¢ã¯ã·ã§ã³ã¯ãªãšãŒã¿ãŒãå°éå
·ã«ããã®ãé¿ããŠãæ§æãããã³ã³ããŒãã³ãã§dispatch()
ã䜿çšãããã connect()
bindActionCreators(Component, actionCreators) => Component
ãå°å
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èŠããããŸãããã ããå®éã«ã¯ã¹ãã¢ã«æ¥ç¶ããŸããã代ããã«ãaction-creator-as-props-wanting-componentãthis.props.dispatch
-wanting-componentã«çœ®ãæããŸããfunction (dispatch, getState) { ... }
ããªã¹ãã«ãã£ãŠ{ action: function (dispatch, getState) { ... } }
ã«å€æãããããã$ incrementAsync()
ããã£ã¹ãããã§ããªããªããŸãã ãµã³ã¯ããã«ãŠã§ã¢ã¯ãããèªèããªããªããŸããããã«ã¯åä»ã§ã¯ãªã解決çããããããããŸããããç§ã¯ãŸã ããããèŠãŠããŸããã
ä»ã®ãšããããã®ã³ããããäŸãšããŠèŠãŠãã ããïŒäžèšã®å¶éããããŸãïŒã
ã³ãŒãã¯æ¬¡ã®ãšããã§ãã
import React, { Component, PropTypes } from 'react';
import { increment, incrementIfOdd, incrementAsync, decrement } from '../actions/counter';
class Counter extends Component {
render() {
const { dispatch, counter } = this.props;
return (
<p>
Clicked: {counter} times
{' '}
<button onClick={() => dispatch(increment())}>+</button>
{' '}
<button onClick={() => dispatch(decrement())}>-</button>
{' '}
<button onClick={() => dispatch(incrementIfOdd())}>Increment if odd</button>
{' '}
<button onClick={() => dispatch(incrementAsync())}>Increment async</button>
</p>
);
}
}
Counter.propTypes = {
dispatch: PropTypes.func.isRequired,
counter: PropTypes.number.isRequired
};
export default Counter;
import React, { Component, PropTypes } from 'react';
import { addToList, removeFromList, performInList } from '../actions/list';
export default function list(mapItemStateToProps) {
return function (Item) {
return class List extends Component {
static propTypes = {
dispatch: PropTypes.func.isRequired,
items: PropTypes.array.isRequired
};
render() {
const { dispatch, items } = this.props;
return (
<div>
<button onClick={() =>
dispatch(addToList())
}>Add counter</button>
<br />
{items.length > 0 &&
<button onClick={() =>
dispatch(removeFromList(items.length - 1))
}>Remove counter</button>
}
<br />
{this.props.items.map((item, index) =>
<Item {...mapItemStateToProps(item)}
key={index}
dispatch={action =>
dispatch(performInList(index, action))
} />
)}
</div>
)
}
}
};
}
export const INCREMENT_COUNTER = 'INCREMENT_COUNTER';
export const DECREMENT_COUNTER = 'DECREMENT_COUNTER';
export function increment() {
return {
type: INCREMENT_COUNTER
};
}
export function decrement() {
return {
type: DECREMENT_COUNTER
};
}
export function incrementIfOdd() {
return (dispatch, getState) => {
const { counter } = getState();
if (counter % 2 === 0) {
return;
}
dispatch(increment());
};
}
export function incrementAsync(delay = 1000) {
return dispatch => {
setTimeout(() => {
dispatch(increment());
}, delay);
};
}
export const ADD_TO_LIST = 'ADD_TO_LIST';
export const REMOVE_FROM_LIST = 'REMOVE_FROM_LIST';
export const PERFORM_IN_LIST = 'PERFORM_IN_LIST';
export function addToList() {
return {
type: ADD_TO_LIST
};
}
export function removeFromList(index) {
return {
type: REMOVE_FROM_LIST,
index
};
}
export function performInList(index, action) {
return {
type: PERFORM_IN_LIST,
index,
action
};
}
import { INCREMENT_COUNTER, DECREMENT_COUNTER } from '../actions/counter';
export default function counter(state = 0, action) {
switch (action.type) {
case INCREMENT_COUNTER:
return state + 1;
case DECREMENT_COUNTER:
return state - 1;
default:
return state;
}
}
import { ADD_TO_LIST, REMOVE_FROM_LIST, PERFORM_IN_LIST } from '../actions/list';
export default function list(reducer) {
return function (state = [], action) {
const {
index,
action: innerAction
} = action;
switch (action.type) {
case ADD_TO_LIST:
return [
...state,
reducer(undefined, action)
];
case REMOVE_FROM_LIST:
return [
...state.slice(0, index),
...state.slice(index + 1)
];
case PERFORM_IN_LIST:
return [
...state.slice(0, index),
reducer(state[index], innerAction),
...state.slice(index + 1)
];
default:
return state;
}
}
}
import { combineReducers } from 'redux';
import counter from './counter';
import list from './list'
const counterList = list(counter);
const rootReducer = combineReducers({
counterList
});
export default rootReducer;
import { bindActionCreators } from 'redux';
import { connect } from 'react-redux';
import Counter from '../components/Counter';
import list from '../components/list';
const CounterList = list(function mapItemStateToProps(itemState) {
return {
counter: itemState
};
})(Counter);
export default connect(function mapStateToProps(state) {
return {
items: state.counterList
};
})(CounterList);
cc @acdlite âããã¯çŸåšã®ããã«ãŠã§ã¢+ ReactReduxã®èšèšãå€å°å£ããŠããäŸã§ãã
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ã ãã
https://github.com/erikras/multireducer/ãã«ãïŒ
ç§ã¯Reactçšã®ãµãŒãã¹ïŒIoCïŒã³ã³ãããŒã®äœ¿çšãå®éšããŠãããæšæ¥ãã®ãã¹ããªããžããªãäœæããŸããïŒ https ïŒ//github.com/magnusjt/react-ioc
CounterListãç¥ããªããã¡ã«ãã¢ã¯ã·ã§ã³ã¯ãªãšãŒã¿ãŒãã«ãŠã³ã¿ãŒã«æž¡ãããšãã§ããã®ã§ãåé¡ã®äžéšã解決ã§ããå¯èœæ§ããããšæããŸãã ãããå¯èœãªã®ã¯ãã¢ã¯ã·ã§ã³ã®äœæè ãå°éå ·ã§ã¯ãªããCounterã®ã³ã³ã¹ãã©ã¯ã¿ãŒã«å ¥ãããã§ãã
äœæããæ°ããCounterã³ã³ããŒãã³ãããšã«ãç°ãªãã¢ã¯ã·ã§ã³ã¯ãªãšãŒã¿ãŒãæž¡ãããšãã§ããŸãïŒãããããã€ã³ããã¯ã¹å€ãã¢ã¯ã·ã§ã³ã¯ãªãšãŒã¿ãŒã«ãã€ã³ãããããšã«ãã£ãŠïŒã ãã¡ãããããŒã¿ãã«ãŠã³ã¿ãŒã«æž¡ãããšã«ã¯ãŸã åé¡ããããŸãã ããããµãŒãã¹ã³ã³ããã§è§£æ±ºã§ãããã®ãã©ããã¯ãŸã ããããŸããã
@gaearon ãããªãã®äŸã¯ç§ã«ã¯æ£ããããã«èŠããŸãã ã¢ã¯ã·ã§ã³ã¯ãªãšãŒã¿ãŒããã¹ããŠãæåŸãŸã§ãã£ã¹ãããããå¿ èŠããããŸãã ãã®ããã«ããŠãé«éé¢æ°ã䜿çšããŠã¢ã¯ã·ã§ã³ãç¥å£ã«çœ®ãããšãã§ããŸãã
ãã ãã2çªç®ã®ãã€ã³ããå¿
èŠãã©ããã¯ããããŸããã æ°ããã¡ãã»ãŒãžåœ¢åŒã®ããã«ããã«ãŠã§ã¢ãèŠéãããšã«ãªããŸããã performInList
ã®å€§ããªåé¡ã¯ãæœè±¡åã1ã€ã®ãªã¹ãã ãã«å¶éããŠããããšã§ãã @ pe3ã¯ãã«ãŠã³ã¿ãŒã®ãªã¹ãã®ãªã¹ãã«ã€ããŠèšåããŸããã ãã®ãããªæ£æçãªæœè±¡åã®ããã«ã¯ãäœããã®åœ¢ã§ã¢ã¯ã·ã§ã³ããã¹ãããå¿
èŠããããšæããŸãã
ãã®ãã±ããã§ã¯ãã¿ã€ãããã¹ãããæ¹æ³ãèãåºããŸãã
https://github.com/rackt/redux/issues/897
ãããããã£ãšæ ¹æ¬çã«ã¯ãã¢ã¯ã·ã§ã³ãå®å šã«ãã¹ãããããšæãã§ãããã
ããããŸãããç§ã¯ã¡ããã©ãããè©ŠããŠã¿ãŸããã
ç§ã¯ç©äºãããªãåçŽåããŸããã ããã¯ããã®æŽŸæãªããšãããåã®ã«ãŠã³ã¿ãŒã¢ããªã§ãïŒ
ãããŠããã«ããã¯åŸã§ãïŒ
ããªããããé©åãªçšèªãã©ããã¯ããããŸãããé¢æ°åããã°ã©ãã³ã°ã§äœãæå³ãããããšã¯ç¥ã£ãŠããŸãããç§ã«ã¯åé¡ãªããšæããŸããã
åºæ¬çã«ãã¢ã¯ã·ã§ã³ã解é€ããããšã§ãã¢ã¯ã·ã§ã³ãå¥ã®ã¢ã¯ã·ã§ã³å ã«ãã¹ãããããšã«ãªããŸãã
const liftActionCreator = liftingAction => actionCreator => action => Object.assign({}, liftingAction, { nextAction: actionCreator(action) })
ãããŠããã¹ããããã¢ã¯ã·ã§ã³ã¯ãã¬ãã¥ãŒãµãŒãæã¡äžããããšã«ãã£ãŠå¥ããããŸãã ãªããã£ã³ã°ã¬ãã¥ãŒãµãŒã¯åºæ¬çã«ããµããªãã¥ãŒãµãŒïŒé©åãªã¢ã¯ã·ã§ã³ã§éšåçã«é©çšãããŸãïŒãããã€ãã®ãµãã¹ããŒãã«é©çšããŸãã
const liftReducer = liftingReducer => reducer => (state, action) => liftingReducer(state, action)((subState) => reducer(subState, action.nextAction))
ãããã£ãŠãã³ã³ããŒãã³ãã¬ãã¥ãŒãµãŒã®ãªã¹ãã«ã¯ããµãã¢ã¯ã·ã§ã³ãé©çšãããã€ã³ããã¯ã¹ã®ã³ã³ããŒãã³ããæå®ããã¢ã¯ã·ã§ã³ããããŸãã
// list actions
const LIST_INDEX = 'LIST_INDEX'
function actOnIndex(i) {
return {
type: LIST_INDEX,
index: i
}
}
ãããŠãç§ã¯ãé«æ¬¡ãïŒã¡ããã©æ£ãããšæããå¥ã®æŽŸæãªçšèªããã;ïŒã¬ãã¥ãŒãµãŒãæã£ãŠããŸããããã¯ãµãã¬ãã¥ãŒãµãŒãé©åãªãµãã¹ããŒãã«é©çšããŸãã
const list = (state=[], action) => (reduce) => {
switch (action.type) {
case LIST_INDEX:
let nextState = state.slice(0)
nextState[action.index] = reduce(nextState[action.index])
return nextState
default:
return state;
}
}
ãããŠãæ®ã£ãŠããã®ã¯ãã«ãŠã³ãã¬ãã¥ãŒãµãŒããªã¹ãã¬ãã¥ãŒãµãŒã«ãæã¡äžãããããšã ãã§ãã
const reducer = combineReducers({
counts: liftReducer(list)(count)
});
ãããŠãã«ãŠã³ã¿ãŒã®ãªã¹ãã«ã€ããŠã¯ãã¢ã¯ã·ã§ã³ãã«ãŠã³ã¿ãŒã«æž¡ããšãã«ã¢ã¯ã·ã§ã³ã解é€ããå¿ èŠããããŸãã
class App extends Component {
render() {
const counters = [0,1,2,3,4].map((i) => {
return (
<Counter count={this.props.state.counts[i]}
increment={liftActionCreator(actOnIndex(i))(increment)}
decrement={liftActionCreator(actOnIndex(i))(decrement)}
dispatch={this.props.dispatch}
key={i}/>
)
})
return (
<div>
{counters}
</div>
);
}
}
ããã¯é©åãªçšèªã§ãã圢åŒåã§ãããšæããŸãã ããã§ã¯é«æ¬¡ã¬ãã¥ãŒãµãŒã«ãã¬ã³ãºã䜿ãããšæããŸãããããŸã䜿ã£ãããšããããŸããã
ãããŠãæåŸã®ã³ã¡ã³ãã§èšã£ãããšãåãæ»ããŸã- @ gaearonã¯æ£ããã§ãã ãã®ããã«ã¢ã¯ã·ã§ã³ããã¹ããããšãããã«ãŠã§ã¢ãèŠéãããšã«ãªããã¢ã¯ã·ã§ã³ã¯ãªãšãŒã¿ãŒãæäœã§ããããã«ããã£ã¹ããããæåŸãŸã§æž¡ãå¿ èŠããããŸãã ããããããããµããŒãããããã«ãReduxã¯ããã«ãŠã§ã¢ãä»ããŠãã¹ãŠã®ãµãã¢ã¯ã·ã§ã³ãé©çšããå¿ èŠããããŸãã ãŸããå¥ã®åé¡ã¯ããªã¹ãå ã®ç¶æ ãåæåããããšã§ã...
ããªãã説æããŠããã®ã¯ElmArchitectureãšããŠç¥ãããŠããŸãã ãã¡ããã芧ãã ããïŒ https ïŒ//github.com/gaearon/react-elmish-example
ãããããªãã¯ãã€ãäžæ©å ãè¡ã£ãŠããŸãïŒ ã¯ãŒã«ãªãã®ãžã®ãªã³ã¯ã§ç§ã«ã·ã£ã¯ãŒã济ã³ãŠãã ããïŒ+1ïŒ
ã©ãããããã³ã³ããŒãã³ãããããã«ãŠã§ã¢ãå¿ èŠãšããã¢ã¯ã·ã§ã³ããã£ã¹ãããããããšã¯ã§ããŸããã ããã¯æ®å¿µã§ãïŒ ã«ãŠã³ã¿ãŒããªã¹ãã§ã©ãããããšãé¢æ°ïŒdispatchãgetStateïŒ{...}ã{actionïŒfunctionïŒdispatchãgetStateïŒ{...}}ã«å€æããããããincrementAsyncïŒïŒããã£ã¹ãããã§ããªããªããŸãããªã¹ãâãããŠãã ïŒ ãµã³ã¯ããã«ãŠã§ã¢ã¯ãããèªèããªããªããŸãã
@gaearonãã®ãœãªã¥ãŒã·ã§ã³ã¯ã©ãã§ããïŒ äžè¬çãªã¬ãã¥ãŒãµãŒãèªåèªèº«ããã®ãããªåã¬ãã¥ãŒãµãŒãšåŒã¶ä»£ããã«
case PERFORM_IN_LIST:
return [
...state.slice(0, index),
reducer(state[index], innerAction),
...state.slice(index + 1)
];
dispatch
ã®ããã«æ©èœããç¹å¥ãªã¡ãœããdispatchTo(reducer, state, action, callback)
ãã¹ãã¢ã«æäŸããŸãããã ããåã¬ãã¥ãŒãµãŒã«çŽæ¥ãã£ã¹ããããïŒæ§æãããŠãããã¹ãŠã®ããã«ãŠã§ã¢ãä»ããŠïŒãåã®ç¶æ
ãå€æŽããããã³ã«ã³ãŒã«ããã¯ã«éç¥ããŸãã
export default function list(reducer, dispatchTo) {
return function (state = [], action) {
...
case PERFORM_IN_LIST:
dispatchTo(reducer, state[index], innerAction, newState =>
[
...state.slice(0, index),
newState,
...state.slice(index + 1)
]);
default:
return state;
}
}
}
ãããReduxã§å®è¡å¯èœãã©ããã¯ããããŸããã ã¢ã€ãã¢ã¯ãããã€ãã®ããã«ãŠã§ã¢ãã«ãŒãã¹ãã¢ãšããŠæ§æãããç¶æ
ããªãŒã®ãã®éšåã®åã¹ãã¢ãè¿ãå
éšstore.derive(reducer, state)
ã¡ãœããã䜿çšããŠdispatchTo
ãå®è£
ããããšã§ãã äŸãã°
function dispatchTo(reducer, state, action, callback) {
const childStore = store.derive(reducer, state)
childStore.subscribe(() => setRootState( callback(getState() ))
childStore.dispatch(action)
}
Reduxã®å éšãç¥ããªããšèšã£ãã®ã§ãããã¯åãªãã¢ã€ãã¢ãªã®ã§ãäœããéãããããããŸãã
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ããããæåã®è§£æ±ºçã¯ã store.derive(reducer)
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ããã¯ããŸãã«ãè€éã§ãIMOã®äŸ¡å€ã¯ãããŸããã ãã®æ¹æ³ã§å®è¡ãããå Žåã¯ãããã«ãŠã§ã¢ã䜿çšããªãã§ãã ããïŒãŸãã¯ã applyMiddleware
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ãŸããããã«å¯Ÿå¿ããäºå®ããªããããç· ãåããŸãã
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ãã®ã³ãããã§æ·»ä»ããã³ãŒãäŸïŒ https ïŒ//github.com/rackt/redux/commit/a83002aed8e36f901ebb5f139dd14ce9c2e4cab4
ã«ãŠã³ã¿ãŒã®ãªã¹ãã2ã€ïŒãŸãã¯å¥ã
ã®ãã¢ãã«ãïŒããå Žåãã¢ã¯ã·ã§ã³ã¿ã€ããåãã§ããããã addToList
ããã£ã¹ããããããšãäž¡æ¹ã®ãªã¹ãã«ã¢ã€ãã ãè¿œå ãããŸãã
// reducers/index.js
import { combineReducers } from 'redux';
import counter from './counter';
import list from './list'
const counterList = list(counter);
const counterList2 = list(counter);
const rootReducer = combineReducers({
counterList,
counterList2
});
export default rootReducer;
ã§ã¯ã reducers/list
ã¯ããã§ã©ã®ããã«åœ¹ç«ã¡ãŸããïŒ ã¢ã¯ã·ã§ã³ã¿ã€ããªã©ã®ãã¬ãã£ãã¯ã¹ãä»ããå¿
èŠã¯ãããŸãããïŒ
ã«ãŠã³ã¿ãŒã®ãªã¹ãã2ã€ïŒãŸãã¯å¥ã ã®ãã¢ãã«ãïŒããå Žåãã¢ã¯ã·ã§ã³ã¿ã€ããåãã§ãããããaddToListããã£ã¹ããããããšäž¡æ¹ã®ãªã¹ãã«ã¢ã€ãã ãè¿œå ãããŸãã
a83002aed8e36f901ebb5f139dd14ce9c2e4cab4ãããèŠãŠãã ããã ã¢ã¯ã·ã§ã³ããã¹ãããŸãã ã³ã³ããã³ã³ããŒãã³ãããæž¡ãããdispatch
ã¯ãã¢ã¯ã·ã§ã³ãperformInList
ã¢ã¯ã·ã§ã³ã«ã©ããããŸãã 次ã«ãå
éšã¢ã¯ã·ã§ã³ãã¬ãã¥ãŒãµãŒã§ååŸãããŸãã ããã¯ãElmã¢ãŒããã¯ãã£ã®åäœãšã»ãŒåãã§ãã
@gaearonäœãã足ããªããããããŸããããäžèšã®è¿œå ã®counterList2
ã¬ãã¥ãŒãµãŒãšãšãã«ããã®UIã¯åã¢ã¯ã·ã§ã³ã®äž¡æ¹ã®ãªã¹ããæŽæ°ããŸãïŒããã¯ããã«ãæ¹æ³ã«å¿ããŠäºæ³ãããŸããã解決çã¯äœã§ããïŒïŒïŒ
// reducers/index.js
import { combineReducers } from 'redux';
import counter from './counter';
import list from './list'
const counterList = list(counter);
const counterList2 = list(counter);
const rootReducer = combineReducers({
counterList,
counterList2
});
export default rootReducer;
// containers/App.js
import React from 'react';
import { bindActionCreators } from 'redux';
import { connect } from 'react-redux';
import counter from '../components/Counter';
import list from '../components/list';
let CounterList = list(function mapItemStateToProps(itemState) {
return {
counter: itemState
};
})(counter);
CounterList = connect(function mapStateToProps(state) {
return {
items: state.counterList
};
})(CounterList);
let CounterList2 = list(function mapItemStateToProps(itemState) {
return {
counter: itemState
};
})(counter);
CounterList2 = connect(function mapStateToProps(state) {
return {
items: state.counterList2
};
})(CounterList2);
export default class App extends React.Component {
render() {
return (
<div>
<CounterList />
<CounterList2 />
</div>
)
}
}
@eladoã«ãŠã³ã¿ãŒã®ãªã¹ãã§è¡ã£ãã®ãšåãããã«ã2ã€ã®ãªã¹ãã§ã¢ã¯ã·ã§ã³ãè¡çªããªãããã«ããªã¹ãã§å床ã©ããããå¿ èŠããããŸãã
@ccorcos
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@ccorcos
ããã«äŸãã¢ããããŒãããŸããïŒhttpïŒ //elado.s3-website-us-west-1.amazonaws.com/redux-counter/
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ãã®æ°ããäŸã§ã¯ããããã¬ãã«ã®ã¢ã¯ã·ã§ã³ã¯ãªãšãŒã¿ãŒãææããŠããŸããã 代ããã«ããã£ã¹ãããé¢æ°ãäžäœã³ã³ããŒãã³ãã«æž¡ãããããã®äžäœã³ã³ããŒãã³ãã¯ã¢ã¯ã·ã§ã³ããã£ã¹ãããé¢æ°ã«æž¡ãããšãã§ããŸãã
æœè±¡åãããŸãæ©èœãããŠã¢ã¯ã·ã§ã³ã®è¡çªãèµ·ãããªãããã«ããããã«ããlistOfãã³ã³ããŒãã³ãããã£ã¹ãããããã®åã«æž¡ããšããå®éã«ã¯ããªã¹ãã³ã³ããŒãã³ããç解ã§ãã圢åŒã§ã¢ã¯ã·ã§ã³ãã©ããããé¢æ°ãæž¡ããŸãã
children.map((child, i) => {
childDispatch = (action) => dispatch({action, index: i})
// ...
ããã§ã listOf(counter)
ãŸãã¯listOf(listOf(counter))
ãäœæã§ããŸãããŸãã pairOf
ãšããã³ã³ããŒãã³ããäœæããå Žåã¯ãã¢ã¯ã·ã§ã³ãæž¡ããšãã«å¿
ãã©ããããå¿
èŠããããŸãã çŸåšã App
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@ccorcos
ããããšãã ãããã£ãŠãçµè«ãšããŠãæããã«ãéæ³ãã¯çºçããŠããŸãããã¢ã¯ã·ã§ã³ã«ã¯ãã¢ã¯ã·ã§ã³ãå®è¡ããã€ã³ã¹ã¿ã³ã¹ãã¬ãã¥ãŒãµãŒã«æ瀺ããããã«å¿
èŠãªãã¹ãŠã®æ
å ±ãå¿
èŠã§ãã listOf(listOf(counter))
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é
åã®äž¡æ¹ã®ã€ã³ããã¯ã¹ãå¿
èŠã«ãªããŸãã listOf(listOf(counter))
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æè»ã§è€éãªReduxã¢ããªãæ§ç¯ããå¯äžã®æ¹æ³ã¯ãã·ã¹ãã å ã®ãã¹ãŠã®ãšã³ãã£ãã£ãã¹ãã¢å ã®IDã§ã€ã³ããã¯ã¹åããããšã§ãã äŸã§ç€ºãããããšãããä»ã®ããåçŽãªã¢ãããŒãã¯ãããã«éçã«éããŸãã ãã®ã€ã³ããã¯ã¹ã¯ãã»ãšãã©ãªã¬ãŒã·ã§ãã«DBã®ãã©ãŒã§ãã
ã¢ã¯ã·ã§ã³ã«ã¯ã2次å é åã®äž¡æ¹ã®ã€ã³ããã¯ã¹ãå¿ èŠã§ã
ããªãã®æèãšè¡åã¯æ¬¡ã®ããã«èãããŸãïŒ
{type: 'increment', index:[0 5]}
ããããå®éã«ã¯æ¬¡ã®ããã«ãªããŸãã
{type:'child', index: 0, action: {type: 'child', index: 5, action: {type: 'increment'}}}
ããããã°ã listOf(listOf(listOf(...listOf(counter)...)))
æ°žé ã«è¡ãããšãã§ããŸãïŒ
ããã¯ãã¹ãŠãšã«ã ããæ¥ãŠããŸãããšããã§ã Elmã¢ãŒããã¯ãã£ãã¥ãŒããªã¢ã«ãã芧ãã ãã
ããŒãã£ãŒã«ã¯å°ãæéãããããŸãããããããããã«ãŠã§ã¢ã§æ©èœããªããå ŽæãããããŸããã @ccorcosãšããŠç¡éã®ãã¹ããæäŸããŠããå Žåããã¹ããåŠçããããã«ããã«ãŠã§ã¢ãæ¥ç¶ããã ãã§ã¯ãããŸãããïŒ ãããšãããã¹ããããã¢ã¯ã·ã§ã³ãå¥åŠããæå³ããredux-thunk
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ãã®ãããªãã®ïŒ
export default function list(reducer) {
return function (state = [
// e.g. 2 counters with default values
reducer(undefined, {}),
reducer(undefined, {}),
], action) {
const {
index,
action: innerAction
} = action;
// ...
}
}
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ãA(undefined, {}) === Sa
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åã§ãïŒ B
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const action = {
type: UNIQUE_ID,
namespace: ['a1']
};
B(undefined, action) == { a1: A(undefined, action*), a2: Sa }
ãããŠãåå空éã®ãªãã¢ã¯ã·ã§ã³ã®åäŸ
const action = {
type: UNIQUE_ID
};
B(undefined, action) == { a1: A(undefined, action), a2: A(undefined, action) }
èŠå
A
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èŠããããŸããããã¯ãã¬ãã¥ãŒãµãŒA
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ã®å Žåãæå³ããŸãã B(undefined, p)
{ a1: Sa, a2: Sa }
ã«ãªãã¯ãã§ããããã¯ãã¡ãªã¿ã«B
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ãšåãã§ããaction*
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èŠããããŸãã ãããã£ãŠã B
ã«æž¡ãããã¢ã¯ã·ã§ã³ã{ type: UNIQUE_ID, namespace: ['a1'] }
ã ã£ãå Žåã A
ã«æž¡ãããã¢ã¯ã·ã§ã³ã¯{ type: UNIQUE_ID, namespace: [] }
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(state = initialState, { ...action, namespace = [] }) => {
var partialAction = { ...action, namespace: namespace.slice(1) };
var newState;
if (reducerCanHandleAction(reducer, action) and namespaceExistsInState(namespace, state)) {
// apply the action to the matching partial reducer
newState = {
...state,
[namespace]: partialReducers[namespace](state[namespace], partialAction)
};
} else if (reducerCantHandleAction(reducer, action) {
// apply the action to all partial reducers
newState = Object.assign(
{},
state,
...Object.keys(partialReducers).map(
namespace => partialReducers[namespace](state[namespace], action)
)
);
} else {
// can't handle the action
return state;
}
return reducer(newState, action);
}
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https://gist.github.com/crisu83/42ecffccad9d04c74605fbc75c9dc9d1
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https://github.com/eloytoro/react-redux-uuid
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